SmogRank / Episodes / United States

North-eastern United States and Canada, May and June 2023

For 13 days, from 31 May to 12 June 2023, 260 cities in the United States and Canada had PM2.5 at least twice their usual for the time of year. The worst reading was Bethlehem, Pennsylvania, United States: 253.0 µg/m³ on 7 June, about 41× its usual 6.1.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached260in 2 countries
Days1331 May to 12 June 2023
Worst day6 June197 cities counted
Furthest above usual42×Rouyn-Noranda

Day by day

6 June 197 cities at twice their usual or more
HermitageKingsportAshevillePortageHickoryGaryCookevilleChicagoOak LawnFranklin ParkClarksvilleColumbiaCandler-McAfeeAtlantaMcDonoughGadsdenDecaturGranite CityJacksonWarner RobinsLemayUniversity CityDyersburgArnoldMuscatineMontgomeryAlbanyWest MemphisBrunswickValdostaJacksonSpringfieldHattiesburgLibertyRaymoreDrummondvilleLaconiaKansas CityTrois-RivièresSaint JosephFort SmithTopekaPortlandTexarkanaBellevueLewistonOmahaL'Ancienne-LoretteQuébecShreveportTulsaJenksLincolnMcAlesterSaguenaySioux FallsAdaCorsicanaLittle RockMaconBartlettTerre HauteHueytownGainesvilleEast RidgeSpartanburgSaint AndrewsSt. LouisChattanoogaCharlotteGreensboroLawrencevillePhenix CityFlorenceRoanoke RapidsGreenvilleTrussvilleHuntsvilleBirminghamJolietHendersonvilleLa CrosseNapervilleDurhamAugustaMaryvilleHammondElkhartLexingtonPaducahDes PlainesSavannahHollandLafayetteCaryValley StationSpringfieldFayettevilleEast ChicagoEvansvilleAnkenyNorthbrookNorth CharlestonAthensLimaCalumet CityKansas CityKokomoNew AlbanyDes MoinesKnoxvilleSteubenvilleIowa CityOwensboroOlatheSpringdaleCharlestonGreenvilleMorrisvillePhiladelphiaClaytonFishersEast Saint LouisDavenportLouisvilleWest MifflinGranbyMcKeesportSouth BendHernandoSaint MatthewsDecaturPortsmouthWaterlooRedfordBostonKalamazooLynnConwayPittsburghRoanokeClintonToledoWhite OakBloomingtonDerryWilkinsburgLowellLebanonClemmonsColumbusMinneapolisBurnsvilleBensalemTorontoWarrenPainesvilleKeeneBlaineQuincyHamiltonShakopeeSaint PaulMolineJeffersontownJeffersonvilleSpringfieldIndianapolisRockfordHaverhillCantonWinston-SalemAshlandCheektowagaYoungstownApple ValleyErieMiddletownGrand RapidsBrossardJohnstownLexington-FayetteWeirton HeightsRutlandFlintCincinnatiMilwaukeeBurlingtonNorwoodMasonBay CityBrantfordRochesterRaleighDaytonElizabethtownClevelandSouth MilwaukeeSaint MichaelZionAkronBarrieRivière-des-Prairies–Pointe-aux-TremblesSaint-Jean-sur-RichelieuBrocktonJenisonDorvalProvidenceAndersonWaukeshaBloomingtonShawiniganSaint CloudGahannaKitchenerDearbornCoventrySault Ste. MarieDublinHopewellSuperiorMontréalMedinaFort ThomasSt. CatharinesMadisonLansingShaker HeightsKenmoreDetroitSpringfieldYpsilantiRichmondDuluthLondonNorth BayTaylorLincoln ParkSt. ThomasGreenfieldChathamHempsteadFall RiverPort HuronSarniaWorcesterChesapeakeCharlottesvilleNorth ChicopeeEau ClaireRockvilleHartfordBuffaloHagerstownEast HamptonAltoonaEwingScaggsvilleGreen BayGreater SudburyPeterboroughNew LondonHunt ValleyJersey CityAppletonPittsfieldRochesterWashingtonNew BrunswickWaterburyPatersonCornwallAlbanyElizabethBaltimoreSpringfieldSouth LaurelFort LeeLindenNewburghDoverSouth VinelandState CollegeDanburyNew HavenEdgewoodUticaRose HillTrentonNewarkHolbrookBayonneNew York CityPleasantvilleNew CityWhite PlainsLebanonLancasterCarlisleWilmingtonBridgeportHarrisburgYorkPennsaukenToms RiverChesterNorristownBearBellevilleReadingScrantonElktonSyracuseRouyn-NorandaAllentownOttawaKingstonBethlehem
28 May311 Jun3691215
Every measured city in the area, coloured by its PM2.5 that day; a dark ring marks a city at twice its usual or more. Bars: cities counted each day, coloured by their median level. Choose a day or press play; without JavaScript, the days link to that day's world ranking.

How it spread

ChesterChester, 28 May: 6.6 µg/m³, 1.0× usualChester, 29 May: 12.9 µg/m³, 2.0× usualChester, 30 May: 17.7 µg/m³, 2.8× usualChester, 31 May: 29.4 µg/m³, 4.7× usualChester, 1 June: 18.3 µg/m³, 2.9× usualChester, 2 June: 17.8 µg/m³, 2.8× usualChester, 3 June: 16.2 µg/m³, 2.6× usualChester, 4 June: 6.8 µg/m³, 1.1× usualChester, 5 June: 8.8 µg/m³, 1.4× usualChester, 6 June: 54.2 µg/m³, 8.6× usualChester, 7 June: 181.0 µg/m³, 29× usualChester, 8 June: 160.0 µg/m³, 25× usualChester, 9 June: 25.5 µg/m³, 4.0× usualChester, 10 June: 20.1 µg/m³, 3.2× usualChester, 11 June: 27.1 µg/m³, 4.3× usualChester, 12 June: 17.2 µg/m³, 2.7× usualChester, 13 June: no readingChester, 14 June: no readingChester, 15 June: 9.1 µg/m³, 1.4× usualNewarkNewark, 28 May: 6.8 µg/m³, 1.0× usualNewark, 29 May: 11.6 µg/m³, 1.7× usualNewark, 30 May: 13.5 µg/m³, 2.0× usualNewark, 31 May: 26.5 µg/m³, 4.0× usualNewark, 1 June: 19.8 µg/m³, 3.0× usualNewark, 2 June: 23.8 µg/m³, 3.6× usualNewark, 3 June: 21.3 µg/m³, 3.2× usualNewark, 4 June: 7.0 µg/m³, 1.0× usualNewark, 5 June: 8.1 µg/m³, 1.2× usualNewark, 6 June: 37.9 µg/m³, 5.7× usualNewark, 7 June: 133.0 µg/m³, 20× usualNewark, 8 June: 148.5 µg/m³, 22× usualNewark, 9 June: 23.3 µg/m³, 3.5× usualNewark, 10 June: 19.3 µg/m³, 2.9× usualNewark, 11 June: 25.5 µg/m³, 3.8× usualNewark, 12 June: 15.7 µg/m³, 2.3× usualNewark, 13 June: 8.4 µg/m³, 1.3× usualNewark, 14 June: 8.5 µg/m³, 1.3× usualNewark, 15 June: 8.5 µg/m³, 1.3× usualAlbanyAlbany, 28 May: 10.1 µg/m³, 1.6× usualAlbany, 29 May: 10.7 µg/m³, 1.7× usualAlbany, 30 May: 6.5 µg/m³, 1.0× usualAlbany, 31 May: 26.6 µg/m³, 4.3× usualAlbany, 1 June: 14.5 µg/m³, 2.3× usualAlbany, 2 June: 16.3 µg/m³, 2.6× usualAlbany, 3 June: 7.1 µg/m³, 1.1× usualAlbany, 4 June: 4.7 µg/m³, 0.8× usualAlbany, 5 June: 9.5 µg/m³, 1.5× usualAlbany, 6 June: 69.3 µg/m³, 11× usualAlbany, 7 June: 102.0 µg/m³, 16× usualAlbany, 8 June: 82.3 µg/m³, 13× usualAlbany, 9 June: 8.4 µg/m³, 1.4× usualAlbany, 10 June: 6.4 µg/m³, 1.0× usualAlbany, 11 June: 19.4 µg/m³, 3.1× usualAlbany, 12 June: 26.4 µg/m³, 4.3× usualAlbany, 13 June: 9.4 µg/m³, 1.5× usualAlbany, 14 June: 9.8 µg/m³, 1.6× usualAlbany, 15 June: 8.2 µg/m³, 1.3× usualBridgeportBridgeport, 28 May: 12.2 µg/m³, 1.9× usualBridgeport, 29 May: 15.4 µg/m³, 2.4× usualBridgeport, 30 May: 18.9 µg/m³, 3.0× usualBridgeport, 31 May: 20.7 µg/m³, 3.2× usualBridgeport, 1 June: 25.9 µg/m³, 4.0× usualBridgeport, 2 June: 16.4 µg/m³, 2.6× usualBridgeport, 3 June: 11.9 µg/m³, 1.9× usualBridgeport, 4 June: 4.3 µg/m³, 0.7× usualBridgeport, 5 June: 4.0 µg/m³, 0.6× usualBridgeport, 6 June: 81.0 µg/m³, 13× usualBridgeport, 7 June: 165.0 µg/m³, 26× usualBridgeport, 8 June: 96.8 µg/m³, 15× usualBridgeport, 9 June: 13.5 µg/m³, 2.1× usualBridgeport, 10 June: 9.5 µg/m³, 1.5× usualBridgeport, 11 June: 31.3 µg/m³, 4.9× usualBridgeport, 12 June: 28.9 µg/m³, 4.5× usualBridgeport, 13 June: 8.5 µg/m³, 1.3× usualBridgeport, 14 June: 11.6 µg/m³, 1.8× usualBridgeport, 15 June: 6.1 µg/m³, 1.0× usualRose HillRose Hill, 28 May: 6.1 µg/m³, 0.9× usualRose Hill, 29 May: 5.8 µg/m³, 0.9× usualRose Hill, 30 May: 19.9 µg/m³, 2.9× usualRose Hill, 31 May: 24.6 µg/m³, 3.6× usualRose Hill, 1 June: 32.8 µg/m³, 4.8× usualRose Hill, 2 June: 32.3 µg/m³, 4.8× usualRose Hill, 3 June: 16.8 µg/m³, 2.5× usualRose Hill, 4 June: 9.1 µg/m³, 1.3× usualRose Hill, 5 June: 9.0 µg/m³, 1.3× usualRose Hill, 6 June: 35.5 µg/m³, 5.2× usualRose Hill, 7 June: 101.0 µg/m³, 15× usualRose Hill, 8 June: 149.0 µg/m³, 22× usualRose Hill, 9 June: 24.6 µg/m³, 3.6× usualRose Hill, 10 June: 20.8 µg/m³, 3.1× usualRose Hill, 11 June: 27.4 µg/m³, 4.0× usualRose Hill, 12 June: 14.0 µg/m³, 2.1× usualRose Hill, 13 June: 8.6 µg/m³, 1.3× usualRose Hill, 14 June: no readingRose Hill, 15 June: 7.1 µg/m³, 1.0× usualSouth VinelandSouth Vineland, 28 May: 5.7 µg/m³, 0.9× usualSouth Vineland, 29 May: 8.2 µg/m³, 1.3× usualSouth Vineland, 30 May: 11.2 µg/m³, 1.7× usualSouth Vineland, 31 May: 12.6 µg/m³, 1.9× usualSouth Vineland, 1 June: 36.3 µg/m³, 5.6× usualSouth Vineland, 2 June: 10.5 µg/m³, 1.6× usualSouth Vineland, 3 June: 9.0 µg/m³, 1.4× usualSouth Vineland, 4 June: 4.3 µg/m³, 0.7× usualSouth Vineland, 5 June: 5.7 µg/m³, 0.9× usualSouth Vineland, 6 June: 23.7 µg/m³, 3.6× usualSouth Vineland, 7 June: no readingSouth Vineland, 8 June: 136.0 µg/m³, 21× usualSouth Vineland, 9 June: 26.2 µg/m³, 4.0× usualSouth Vineland, 10 June: 14.1 µg/m³, 2.2× usualSouth Vineland, 11 June: 22.2 µg/m³, 3.4× usualSouth Vineland, 12 June: 16.2 µg/m³, 2.5× usualSouth Vineland, 13 June: 6.0 µg/m³, 0.9× usualSouth Vineland, 14 June: 7.5 µg/m³, 1.2× usualSouth Vineland, 15 June: 7.3 µg/m³, 1.1× usualDoverDover, 28 May: 4.4 µg/m³, 0.7× usualDover, 29 May: 8.0 µg/m³, 1.2× usualDover, 30 May: 16.2 µg/m³, 2.5× usualDover, 31 May: 13.4 µg/m³, 2.1× usualDover, 1 June: 37.0 µg/m³, 5.7× usualDover, 2 June: 10.3 µg/m³, 1.6× usualDover, 3 June: 9.3 µg/m³, 1.4× usualDover, 4 June: 5.5 µg/m³, 0.8× usualDover, 5 June: 5.9 µg/m³, 0.9× usualDover, 6 June: 27.0 µg/m³, 4.2× usualDover, 7 June: 106.0 µg/m³, 16× usualDover, 8 June: 132.0 µg/m³, 20× usualDover, 9 June: 31.0 µg/m³, 4.8× usualDover, 10 June: 17.4 µg/m³, 2.7× usualDover, 11 June: 25.5 µg/m³, 3.9× usualDover, 12 June: 15.0 µg/m³, 2.3× usualDover, 13 June: 7.8 µg/m³, 1.2× usualDover, 14 June: 8.4 µg/m³, 1.3× usualDover, 15 June: 7.3 µg/m³, 1.1× usualSpringfieldSpringfield, 28 May: 5.7 µg/m³, 0.8× usualSpringfield, 29 May: 6.1 µg/m³, 0.9× usualSpringfield, 30 May: 19.4 µg/m³, 2.7× usualSpringfield, 31 May: 22.6 µg/m³, 3.2× usualSpringfield, 1 June: 29.9 µg/m³, 4.2× usualSpringfield, 2 June: 27.6 µg/m³, 3.9× usualSpringfield, 3 June: 17.0 µg/m³, 2.4× usualSpringfield, 4 June: 8.9 µg/m³, 1.3× usualSpringfield, 5 June: 8.5 µg/m³, 1.2× usualSpringfield, 6 June: 32.9 µg/m³, 4.6× usualSpringfield, 7 June: 89.3 µg/m³, 13× usualSpringfield, 8 June: 128.0 µg/m³, 18× usualSpringfield, 9 June: 22.9 µg/m³, 3.2× usualSpringfield, 10 June: 19.9 µg/m³, 2.8× usualSpringfield, 11 June: 26.1 µg/m³, 3.7× usualSpringfield, 12 June: 14.0 µg/m³, 2.0× usualSpringfield, 13 June: 8.3 µg/m³, 1.2× usualSpringfield, 14 June: 8.5 µg/m³, 1.2× usualSpringfield, 15 June: 6.5 µg/m³, 0.9× usualWashingtonWashington, 28 May: 6.6 µg/m³, 0.9× usualWashington, 29 May: 6.7 µg/m³, 0.9× usualWashington, 30 May: 15.5 µg/m³, 2.1× usualWashington, 31 May: 19.3 µg/m³, 2.6× usualWashington, 1 June: 28.1 µg/m³, 3.7× usualWashington, 2 June: 27.8 µg/m³, 3.7× usualWashington, 3 June: 15.5 µg/m³, 2.1× usualWashington, 4 June: 7.0 µg/m³, 0.9× usualWashington, 5 June: 7.2 µg/m³, 1.0× usualWashington, 6 June: 26.0 µg/m³, 3.5× usualWashington, 7 June: 71.2 µg/m³, 9.5× usualWashington, 8 June: 115.5 µg/m³, 15× usualWashington, 9 June: 19.0 µg/m³, 2.5× usualWashington, 10 June: 16.1 µg/m³, 2.1× usualWashington, 11 June: 23.0 µg/m³, 3.1× usualWashington, 12 June: 13.0 µg/m³, 1.7× usualWashington, 13 June: 7.8 µg/m³, 1.0× usualWashington, 14 June: 7.5 µg/m³, 1.0× usualWashington, 15 June: 7.2 µg/m³, 1.0× usualRouyn-NorandaRouyn-Noranda, 28 May: 7.9 µg/m³, 1.6× usualRouyn-Noranda, 29 May: 6.7 µg/m³, 1.3× usualRouyn-Noranda, 30 May: 10.6 µg/m³, 2.1× usualRouyn-Noranda, 31 May: 13.5 µg/m³, 2.7× usualRouyn-Noranda, 1 June: 14.0 µg/m³, 2.8× usualRouyn-Noranda, 2 June: 32.2 µg/m³, 6.4× usualRouyn-Noranda, 3 June: 183.0 µg/m³, 37× usualRouyn-Noranda, 4 June: 218.0 µg/m³, 44× usualRouyn-Noranda, 5 June: 48.6 µg/m³, 9.7× usualRouyn-Noranda, 6 June: 12.3 µg/m³, 2.5× usualRouyn-Noranda, 7 June: 9.2 µg/m³, 1.8× usualRouyn-Noranda, 8 June: 20.4 µg/m³, 4.1× usualRouyn-Noranda, 9 June: 67.7 µg/m³, 14× usualRouyn-Noranda, 10 June: 24.1 µg/m³, 4.8× usualRouyn-Noranda, 11 June: 6.9 µg/m³, 1.4× usualRouyn-Noranda, 12 June: 35.0 µg/m³, 7.0× usualRouyn-Noranda, 13 June: 16.9 µg/m³, 3.4× usualRouyn-Noranda, 14 June: 9.9 µg/m³, 2.0× usualRouyn-Noranda, 15 June: 17.1 µg/m³, 3.4× usualPleasantvillePleasantville, 28 May: 6.0 µg/m³, 0.9× usualPleasantville, 29 May: 7.6 µg/m³, 1.2× usualPleasantville, 30 May: 10.9 µg/m³, 1.7× usualPleasantville, 31 May: 15.4 µg/m³, 2.4× usualPleasantville, 1 June: 7.1 µg/m³, 1.1× usualPleasantville, 2 June: 55.5 µg/m³, 8.5× usualPleasantville, 3 June: 9.4 µg/m³, 1.4× usualPleasantville, 4 June: 3.5 µg/m³, 0.5× usualPleasantville, 5 June: 5.2 µg/m³, 0.8× usualPleasantville, 6 June: 26.2 µg/m³, 4.0× usualPleasantville, 7 June: 118.0 µg/m³, 18× usualPleasantville, 8 June: 148.0 µg/m³, 23× usualPleasantville, 9 June: 26.0 µg/m³, 4.0× usualPleasantville, 10 June: 16.3 µg/m³, 2.5× usualPleasantville, 11 June: 25.2 µg/m³, 3.9× usualPleasantville, 12 June: 18.4 µg/m³, 2.8× usualPleasantville, 13 June: 5.6 µg/m³, 0.9× usualPleasantville, 14 June: 9.2 µg/m³, 1.4× usualPleasantville, 15 June: 7.0 µg/m³, 1.1× usualKingstonKingston, 28 May: 5.4 µg/m³, 1.0× usualKingston, 29 May: 6.7 µg/m³, 1.3× usualKingston, 30 May: 11.7 µg/m³, 2.3× usualKingston, 31 May: 14.5 µg/m³, 2.8× usualKingston, 1 June: 15.6 µg/m³, 3.0× usualKingston, 2 June: 16.3 µg/m³, 3.1× usualKingston, 3 June: 10.6 µg/m³, 2.0× usualKingston, 4 June: 8.2 µg/m³, 1.6× usualKingston, 5 June: 30.0 µg/m³, 5.8× usualKingston, 6 June: 114.0 µg/m³, 22× usualKingston, 7 June: 210.0 µg/m³, 40× usualKingston, 8 June: 29.3 µg/m³, 5.6× usualKingston, 9 June: 4.3 µg/m³, 0.8× usualKingston, 10 June: 28.7 µg/m³, 5.5× usualKingston, 11 June: 23.8 µg/m³, 4.6× usualKingston, 12 June: 20.0 µg/m³, 3.8× usualKingston, 13 June: 10.1 µg/m³, 1.9× usualKingston, 14 June: 9.9 µg/m³, 1.9× usualKingston, 15 June: 9.3 µg/m³, 1.8× usualOttawaOttawa, 28 May: 7.1 µg/m³, 1.3× usualOttawa, 29 May: 7.4 µg/m³, 1.4× usualOttawa, 30 May: 9.1 µg/m³, 1.7× usualOttawa, 31 May: 12.8 µg/m³, 2.4× usualOttawa, 1 June: 14.3 µg/m³, 2.6× usualOttawa, 2 June: 16.5 µg/m³, 3.1× usualOttawa, 3 June: 9.4 µg/m³, 1.7× usualOttawa, 4 June: 8.4 µg/m³, 1.6× usualOttawa, 5 June: 49.0 µg/m³, 9.1× usualOttawa, 6 June: 138.5 µg/m³, 26× usualOttawa, 7 June: 208.0 µg/m³, 39× usualOttawa, 8 June: 3.3 µg/m³, 0.6× usualOttawa, 9 June: 3.7 µg/m³, 0.7× usualOttawa, 10 June: 5.8 µg/m³, 1.1× usualOttawa, 11 June: 18.8 µg/m³, 3.5× usualOttawa, 12 June: 20.8 µg/m³, 3.9× usualOttawa, 13 June: 11.1 µg/m³, 2.1× usualOttawa, 14 June: 12.8 µg/m³, 2.4× usualOttawa, 15 June: 24.9 µg/m³, 4.6× usualBellevilleBelleville, 28 May: 7.4 µg/m³, 1.4× usualBelleville, 29 May: 8.6 µg/m³, 1.7× usualBelleville, 30 May: 8.7 µg/m³, 1.7× usualBelleville, 31 May: 15.3 µg/m³, 2.9× usualBelleville, 1 June: 17.3 µg/m³, 3.3× usualBelleville, 2 June: 18.0 µg/m³, 3.5× usualBelleville, 3 June: 12.4 µg/m³, 2.4× usualBelleville, 4 June: 14.3 µg/m³, 2.8× usualBelleville, 5 June: 50.2 µg/m³, 9.7× usualBelleville, 6 June: 109.0 µg/m³, 21× usualBelleville, 7 June: 155.0 µg/m³, 30× usualBelleville, 8 June: 29.6 µg/m³, 5.7× usualBelleville, 9 June: 9.6 µg/m³, 1.8× usualBelleville, 10 June: 26.3 µg/m³, 5.1× usualBelleville, 11 June: 29.5 µg/m³, 5.7× usualBelleville, 12 June: 21.6 µg/m³, 4.2× usualBelleville, 13 June: 11.5 µg/m³, 2.2× usualBelleville, 14 June: 11.0 µg/m³, 2.1× usualBelleville, 15 June: 9.8 µg/m³, 1.9× usualMinneapolisMinneapolis, 28 May: 8.8 µg/m³, 1.4× usualMinneapolis, 29 May: 9.3 µg/m³, 1.5× usualMinneapolis, 30 May: 11.0 µg/m³, 1.8× usualMinneapolis, 31 May: 11.1 µg/m³, 1.8× usualMinneapolis, 1 June: 11.1 µg/m³, 1.8× usualMinneapolis, 2 June: 12.4 µg/m³, 2.0× usualMinneapolis, 3 June: 12.7 µg/m³, 2.0× usualMinneapolis, 4 June: 20.3 µg/m³, 3.3× usualMinneapolis, 5 June: 28.4 µg/m³, 4.6× usualMinneapolis, 6 June: 31.6 µg/m³, 5.1× usualMinneapolis, 7 June: 16.4 µg/m³, 2.6× usualMinneapolis, 8 June: 12.3 µg/m³, 2.0× usualMinneapolis, 9 June: 19.7 µg/m³, 3.2× usualMinneapolis, 10 June: 13.0 µg/m³, 2.1× usualMinneapolis, 11 June: 6.9 µg/m³, 1.1× usualMinneapolis, 12 June: 12.6 µg/m³, 2.0× usualMinneapolis, 13 June: 10.6 µg/m³, 1.7× usualMinneapolis, 14 June: 105.0 µg/m³, 17× usualMinneapolis, 15 June: 41.4 µg/m³, 6.7× usualSaint PaulSaint Paul, 28 May: 7.3 µg/m³, 1.2× usualSaint Paul, 29 May: 7.6 µg/m³, 1.3× usualSaint Paul, 30 May: 10.5 µg/m³, 1.8× usualSaint Paul, 31 May: 12.6 µg/m³, 2.1× usualSaint Paul, 1 June: 10.9 µg/m³, 1.8× usualSaint Paul, 2 June: 12.2 µg/m³, 2.1× usualSaint Paul, 3 June: 13.6 µg/m³, 2.3× usualSaint Paul, 4 June: 19.9 µg/m³, 3.4× usualSaint Paul, 5 June: 26.4 µg/m³, 4.5× usualSaint Paul, 6 June: 30.4 µg/m³, 5.2× usualSaint Paul, 7 June: 13.7 µg/m³, 2.3× usualSaint Paul, 8 June: 11.4 µg/m³, 1.9× usualSaint Paul, 9 June: 18.3 µg/m³, 3.1× usualSaint Paul, 10 June: 13.7 µg/m³, 2.3× usualSaint Paul, 11 June: 6.9 µg/m³, 1.2× usualSaint Paul, 12 June: 12.7 µg/m³, 2.2× usualSaint Paul, 13 June: 10.9 µg/m³, 1.8× usualSaint Paul, 14 June: 105.0 µg/m³, 18× usualSaint Paul, 15 June: 36.9 µg/m³, 6.3× usualBurnsvilleBurnsville, 28 May: 9.4 µg/m³, 1.5× usualBurnsville, 29 May: 9.5 µg/m³, 1.6× usualBurnsville, 30 May: 11.6 µg/m³, 1.9× usualBurnsville, 31 May: 12.5 µg/m³, 2.0× usualBurnsville, 1 June: 11.3 µg/m³, 1.9× usualBurnsville, 2 June: 13.1 µg/m³, 2.1× usualBurnsville, 3 June: 14.2 µg/m³, 2.3× usualBurnsville, 4 June: 21.1 µg/m³, 3.5× usualBurnsville, 5 June: 31.0 µg/m³, 5.1× usualBurnsville, 6 June: 31.3 µg/m³, 5.1× usualBurnsville, 7 June: 20.4 µg/m³, 3.3× usualBurnsville, 8 June: 12.6 µg/m³, 2.1× usualBurnsville, 9 June: 18.9 µg/m³, 3.1× usualBurnsville, 10 June: 14.2 µg/m³, 2.3× usualBurnsville, 11 June: 6.7 µg/m³, 1.1× usualBurnsville, 12 June: 12.6 µg/m³, 2.1× usualBurnsville, 13 June: 10.7 µg/m³, 1.8× usualBurnsville, 14 June: 95.5 µg/m³, 16× usualBurnsville, 15 June: 54.7 µg/m³, 9.0× usualBethlehemBethlehem, 28 May: 7.1 µg/m³, 1.2× usualBethlehem, 29 May: 11.7 µg/m³, 1.9× usualBethlehem, 30 May: 9.1 µg/m³, 1.5× usualBethlehem, 31 May: 17.8 µg/m³, 2.9× usualBethlehem, 1 June: 19.6 µg/m³, 3.2× usualBethlehem, 2 June: 15.1 µg/m³, 2.5× usualBethlehem, 3 June: 13.2 µg/m³, 2.2× usualBethlehem, 4 June: 7.2 µg/m³, 1.2× usualBethlehem, 5 June: 11.4 µg/m³, 1.9× usualBethlehem, 6 June: 77.2 µg/m³, 13× usualBethlehem, 7 June: 253.0 µg/m³, 41× usualBethlehem, 8 June: 135.0 µg/m³, 22× usualBethlehem, 9 June: 15.2 µg/m³, 2.5× usualBethlehem, 10 June: 19.1 µg/m³, 3.1× usualBethlehem, 11 June: 24.4 µg/m³, 4.0× usualBethlehem, 12 June: 19.3 µg/m³, 3.2× usualBethlehem, 13 June: 8.0 µg/m³, 1.3× usualBethlehem, 14 June: 9.0 µg/m³, 1.5× usualBethlehem, 15 June: 8.6 µg/m³, 1.4× usualAllentownAllentown, 28 May: 6.6 µg/m³, 1.0× usualAllentown, 29 May: 12.1 µg/m³, 1.9× usualAllentown, 30 May: 8.6 µg/m³, 1.3× usualAllentown, 31 May: 18.0 µg/m³, 2.8× usualAllentown, 1 June: 19.3 µg/m³, 3.0× usualAllentown, 2 June: 17.2 µg/m³, 2.7× usualAllentown, 3 June: 13.2 µg/m³, 2.1× usualAllentown, 4 June: 7.1 µg/m³, 1.1× usualAllentown, 5 June: 10.9 µg/m³, 1.7× usualAllentown, 6 June: 77.6 µg/m³, 12× usualAllentown, 7 June: 239.0 µg/m³, 37× usualAllentown, 8 June: 125.0 µg/m³, 20× usualAllentown, 9 June: 16.4 µg/m³, 2.6× usualAllentown, 10 June: 19.1 µg/m³, 3.0× usualAllentown, 11 June: 24.5 µg/m³, 3.8× usualAllentown, 12 June: 19.2 µg/m³, 3.0× usualAllentown, 13 June: 7.6 µg/m³, 1.2× usualAllentown, 14 June: 8.3 µg/m³, 1.3× usualAllentown, 15 June: 8.4 µg/m³, 1.3× usualScrantonScranton, 28 May: 8.6 µg/m³, 1.2× usualScranton, 29 May: 11.2 µg/m³, 1.6× usualScranton, 30 May: 10.6 µg/m³, 1.5× usualScranton, 31 May: 11.8 µg/m³, 1.7× usualScranton, 1 June: 12.0 µg/m³, 1.7× usualScranton, 2 June: 16.0 µg/m³, 2.3× usualScranton, 3 June: 14.3 µg/m³, 2.1× usualScranton, 4 June: 8.0 µg/m³, 1.2× usualScranton, 5 June: 17.0 µg/m³, 2.5× usualScranton, 6 June: 98.3 µg/m³, 14× usualScranton, 7 June: 215.0 µg/m³, 31× usualScranton, 8 June: 96.8 µg/m³, 14× usualScranton, 9 June: 14.9 µg/m³, 2.2× usualScranton, 10 June: 20.2 µg/m³, 2.9× usualScranton, 11 June: no readingScranton, 12 June: no readingScranton, 13 June: 9.3 µg/m³, 1.3× usualScranton, 14 June: 10.2 µg/m³, 1.5× usualScranton, 15 June: 10.4 µg/m³, 1.5× usualReadingReading, 28 May: 6.8 µg/m³, 1.0× usualReading, 29 May: 11.1 µg/m³, 1.7× usualReading, 30 May: 8.7 µg/m³, 1.3× usualReading, 31 May: 16.5 µg/m³, 2.5× usualReading, 1 June: 14.7 µg/m³, 2.2× usualReading, 2 June: 16.6 µg/m³, 2.5× usualReading, 3 June: 13.7 µg/m³, 2.1× usualReading, 4 June: 8.5 µg/m³, 1.3× usualReading, 5 June: 11.6 µg/m³, 1.8× usualReading, 6 June: 62.5 µg/m³, 9.5× usualReading, 7 June: 204.0 µg/m³, 31× usualReading, 8 June: 168.0 µg/m³, 25× usualReading, 9 June: 17.4 µg/m³, 2.6× usualReading, 10 June: 19.7 µg/m³, 3.0× usualReading, 11 June: 24.3 µg/m³, 3.7× usualReading, 12 June: 16.1 µg/m³, 2.4× usualReading, 13 June: 9.1 µg/m³, 1.4× usualReading, 14 June: 8.8 µg/m³, 1.3× usualReading, 15 June: 8.0 µg/m³, 1.2× usualPennsaukenPennsauken, 28 May: 6.7 µg/m³, 0.9× usualPennsauken, 29 May: 12.7 µg/m³, 1.7× usualPennsauken, 30 May: 16.4 µg/m³, 2.2× usualPennsauken, 31 May: 20.7 µg/m³, 2.7× usualPennsauken, 1 June: 21.0 µg/m³, 2.8× usualPennsauken, 2 June: 23.5 µg/m³, 3.1× usualPennsauken, 3 June: 14.7 µg/m³, 1.9× usualPennsauken, 4 June: 6.4 µg/m³, 0.8× usualPennsauken, 5 June: 9.4 µg/m³, 1.2× usualPennsauken, 6 June: 58.3 µg/m³, 7.7× usualPennsauken, 7 June: 204.0 µg/m³, 27× usualPennsauken, 8 June: 145.0 µg/m³, 19× usualPennsauken, 9 June: 23.2 µg/m³, 3.1× usualPennsauken, 10 June: 22.0 µg/m³, 2.9× usualPennsauken, 11 June: 27.7 µg/m³, 3.6× usualPennsauken, 12 June: 19.8 µg/m³, 2.6× usualPennsauken, 13 June: 8.8 µg/m³, 1.2× usualPennsauken, 14 June: 9.8 µg/m³, 1.3× usualPennsauken, 15 June: 9.2 µg/m³, 1.2× usualNorristownNorristown, 28 May: 7.0 µg/m³, 1.0× usualNorristown, 29 May: 11.0 µg/m³, 1.6× usualNorristown, 30 May: 13.1 µg/m³, 1.9× usualNorristown, 31 May: 20.0 µg/m³, 2.9× usualNorristown, 1 June: 19.1 µg/m³, 2.8× usualNorristown, 2 June: 22.3 µg/m³, 3.3× usualNorristown, 3 June: 14.2 µg/m³, 2.1× usualNorristown, 4 June: 6.6 µg/m³, 1.0× usualNorristown, 5 June: 8.7 µg/m³, 1.3× usualNorristown, 6 June: 54.4 µg/m³, 8.0× usualNorristown, 7 June: 202.0 µg/m³, 30× usualNorristown, 8 June: 165.0 µg/m³, 24× usualNorristown, 9 June: 21.9 µg/m³, 3.2× usualNorristown, 10 June: 20.1 µg/m³, 3.0× usualNorristown, 11 June: 25.4 µg/m³, 3.7× usualNorristown, 12 June: 18.0 µg/m³, 2.6× usualNorristown, 13 June: 8.6 µg/m³, 1.3× usualNorristown, 14 June: 8.7 µg/m³, 1.3× usualNorristown, 15 June: 8.5 µg/m³, 1.3× usualHarrisburgHarrisburg, 28 May: 8.2 µg/m³, 1.1× usualHarrisburg, 29 May: 12.8 µg/m³, 1.7× usualHarrisburg, 30 May: 10.9 µg/m³, 1.5× usualHarrisburg, 31 May: 15.5 µg/m³, 2.1× usualHarrisburg, 1 June: 17.8 µg/m³, 2.4× usualHarrisburg, 2 June: 17.6 µg/m³, 2.3× usualHarrisburg, 3 June: 16.4 µg/m³, 2.2× usualHarrisburg, 4 June: 10.0 µg/m³, 1.3× usualHarrisburg, 5 June: 12.3 µg/m³, 1.6× usualHarrisburg, 6 June: 51.2 µg/m³, 6.8× usualHarrisburg, 7 June: 148.0 µg/m³, 20× usualHarrisburg, 8 June: 195.0 µg/m³, 26× usualHarrisburg, 9 June: 24.8 µg/m³, 3.3× usualHarrisburg, 10 June: 23.1 µg/m³, 3.1× usualHarrisburg, 11 June: 28.6 µg/m³, 3.8× usualHarrisburg, 12 June: 19.0 µg/m³, 2.5× usualHarrisburg, 13 June: 10.9 µg/m³, 1.5× usualHarrisburg, 14 June: 7.8 µg/m³, 1.0× usualHarrisburg, 15 June: 9.1 µg/m³, 1.2× usualYorkYork, 28 May: 6.0 µg/m³, 0.8× usualYork, 29 May: 14.7 µg/m³, 2.0× usualYork, 30 May: 10.9 µg/m³, 1.5× usualYork, 31 May: 18.4 µg/m³, 2.6× usualYork, 1 June: 20.5 µg/m³, 2.8× usualYork, 2 June: 19.2 µg/m³, 2.7× usualYork, 3 June: 17.7 µg/m³, 2.5× usualYork, 4 June: 9.9 µg/m³, 1.4× usualYork, 5 June: 11.4 µg/m³, 1.6× usualYork, 6 June: 43.6 µg/m³, 6.1× usualYork, 7 June: 117.0 µg/m³, 16× usualYork, 8 June: 193.0 µg/m³, 27× usualYork, 9 June: 25.8 µg/m³, 3.6× usualYork, 10 June: 21.3 µg/m³, 3.0× usualYork, 11 June: 25.3 µg/m³, 3.5× usualYork, 12 June: 16.7 µg/m³, 2.3× usualYork, 13 June: 10.4 µg/m³, 1.4× usualYork, 14 June: 8.6 µg/m³, 1.2× usualYork, 15 June: 9.7 µg/m³, 1.3× usualElktonElkton, 28 May: 6.2 µg/m³, 1.1× usualElkton, 29 May: 10.0 µg/m³, 1.8× usualElkton, 30 May: 15.8 µg/m³, 2.8× usualElkton, 31 May: 22.8 µg/m³, 4.0× usualElkton, 1 June: 18.9 µg/m³, 3.3× usualElkton, 2 June: 18.5 µg/m³, 3.2× usualElkton, 3 June: 11.6 µg/m³, 2.0× usualElkton, 4 June: 6.7 µg/m³, 1.2× usualElkton, 5 June: 7.6 µg/m³, 1.3× usualElkton, 6 June: 34.7 µg/m³, 6.1× usualElkton, 7 June: 132.0 µg/m³, 23× usualElkton, 8 June: 185.0 µg/m³, 32× usualElkton, 9 June: 26.6 µg/m³, 4.7× usualElkton, 10 June: 20.3 µg/m³, 3.6× usualElkton, 11 June: 26.4 µg/m³, 4.6× usualElkton, 12 June: 16.1 µg/m³, 2.8× usualElkton, 13 June: 8.9 µg/m³, 1.6× usualElkton, 14 June: 8.3 µg/m³, 1.5× usualElkton, 15 June: 8.1 µg/m³, 1.4× usualSyracuseSyracuse, 28 May: 6.9 µg/m³, 1.3× usualSyracuse, 29 May: 8.3 µg/m³, 1.6× usualSyracuse, 30 May: 10.9 µg/m³, 2.1× usualSyracuse, 31 May: 10.6 µg/m³, 2.0× usualSyracuse, 1 June: 14.9 µg/m³, 2.9× usualSyracuse, 2 June: 15.5 µg/m³, 3.0× usualSyracuse, 3 June: 12.4 µg/m³, 2.4× usualSyracuse, 4 June: 8.5 µg/m³, 1.6× usualSyracuse, 5 June: 24.7 µg/m³, 4.8× usualSyracuse, 6 June: 89.5 µg/m³, 17× usualSyracuse, 7 June: 181.0 µg/m³, 35× usualSyracuse, 8 June: 40.4 µg/m³, 7.8× usualSyracuse, 9 June: 11.6 µg/m³, 2.2× usualSyracuse, 10 June: 18.5 µg/m³, 3.6× usualSyracuse, 11 June: 20.1 µg/m³, 3.9× usualSyracuse, 12 June: 21.2 µg/m³, 4.1× usualSyracuse, 13 June: 9.3 µg/m³, 1.8× usualSyracuse, 14 June: 7.7 µg/m³, 1.5× usualSyracuse, 15 June: 8.3 µg/m³, 1.6× usualLebanonLebanon, 28 May: 7.2 µg/m³, 1.0× usualLebanon, 29 May: 11.5 µg/m³, 1.6× usualLebanon, 30 May: 9.5 µg/m³, 1.3× usualLebanon, 31 May: 15.6 µg/m³, 2.1× usualLebanon, 1 June: 16.1 µg/m³, 2.2× usualLebanon, 2 June: 18.3 µg/m³, 2.5× usualLebanon, 3 June: 16.9 µg/m³, 2.3× usualLebanon, 4 June: 9.8 µg/m³, 1.3× usualLebanon, 5 June: 12.4 µg/m³, 1.7× usualLebanon, 6 June: 55.1 µg/m³, 7.5× usualLebanon, 7 June: 181.0 µg/m³, 25× usualLebanon, 8 June: 171.0 µg/m³, 23× usualLebanon, 9 June: 19.9 µg/m³, 2.7× usualLebanon, 10 June: 20.5 µg/m³, 2.8× usualLebanon, 11 June: 26.0 µg/m³, 3.6× usualLebanon, 12 June: 16.5 µg/m³, 2.3× usualLebanon, 13 June: 9.5 µg/m³, 1.3× usualLebanon, 14 June: 8.8 µg/m³, 1.2× usualLebanon, 15 June: 8.3 µg/m³, 1.1× usualBearBear, 28 May: 5.1 µg/m³, 0.8× usualBear, 29 May: 9.4 µg/m³, 1.5× usualBear, 30 May: 16.6 µg/m³, 2.7× usualBear, 31 May: 18.9 µg/m³, 3.1× usualBear, 1 June: 13.1 µg/m³, 2.1× usualBear, 2 June: 12.5 µg/m³, 2.0× usualBear, 3 June: 11.7 µg/m³, 1.9× usualBear, 4 June: 6.6 µg/m³, 1.1× usualBear, 5 June: 8.0 µg/m³, 1.3× usualBear, 6 June: 39.9 µg/m³, 6.5× usualBear, 7 June: 154.0 µg/m³, 25× usualBear, 8 June: 181.0 µg/m³, 30× usualBear, 9 June: 26.1 µg/m³, 4.3× usualBear, 10 June: 20.1 µg/m³, 3.3× usualBear, 11 June: 27.1 µg/m³, 4.4× usualBear, 12 June: 17.2 µg/m³, 2.8× usualBear, 13 June: 9.2 µg/m³, 1.5× usualBear, 14 June: 9.1 µg/m³, 1.5× usualBear, 15 June: 8.0 µg/m³, 1.3× usualLancasterLancaster, 28 May: 8.1 µg/m³, 1.2× usualLancaster, 29 May: 16.0 µg/m³, 2.4× usualLancaster, 30 May: 10.4 µg/m³, 1.5× usualLancaster, 31 May: 17.9 µg/m³, 2.6× usualLancaster, 1 June: 22.5 µg/m³, 3.3× usualLancaster, 2 June: 22.5 µg/m³, 3.3× usualLancaster, 3 June: 16.1 µg/m³, 2.4× usualLancaster, 4 June: 8.8 µg/m³, 1.3× usualLancaster, 5 June: no readingLancaster, 6 June: 51.2 µg/m³, 7.5× usualLancaster, 7 June: 142.0 µg/m³, 21× usualLancaster, 8 June: 172.0 µg/m³, 25× usualLancaster, 9 June: 23.5 µg/m³, 3.5× usualLancaster, 10 June: 21.9 µg/m³, 3.2× usualLancaster, 11 June: 27.3 µg/m³, 4.0× usualLancaster, 12 June: 16.6 µg/m³, 2.4× usualLancaster, 13 June: 10.8 µg/m³, 1.6× usualLancaster, 14 June: 10.1 µg/m³, 1.5× usualLancaster, 15 June: 10.1 µg/m³, 1.5× usualNew York CityNew York City, 28 May: 6.1 µg/m³, 0.8× usualNew York City, 29 May: 10.8 µg/m³, 1.4× usualNew York City, 30 May: 12.6 µg/m³, 1.7× usualNew York City, 31 May: 11.7 µg/m³, 1.6× usualNew York City, 1 June: 15.7 µg/m³, 2.1× usualNew York City, 2 June: 15.5 µg/m³, 2.1× usualNew York City, 3 June: 12.3 µg/m³, 1.6× usualNew York City, 4 June: 4.7 µg/m³, 0.6× usualNew York City, 5 June: 10.0 µg/m³, 1.3× usualNew York City, 6 June: 79.9 µg/m³, 11× usualNew York City, 7 June: 170.0 µg/m³, 23× usualNew York City, 8 June: 92.6 µg/m³, 12× usualNew York City, 9 June: 13.4 µg/m³, 1.8× usualNew York City, 10 June: 13.4 µg/m³, 1.8× usualNew York City, 11 June: 30.6 µg/m³, 4.1× usualNew York City, 12 June: 24.4 µg/m³, 3.3× usualNew York City, 13 June: 7.8 µg/m³, 1.0× usualNew York City, 14 June: 9.5 µg/m³, 1.3× usualNew York City, 15 June: 7.9 µg/m³, 1.1× usualWilmingtonWilmington, 28 May: 5.8 µg/m³, 0.9× usualWilmington, 29 May: 11.6 µg/m³, 1.8× usualWilmington, 30 May: 15.7 µg/m³, 2.4× usualWilmington, 31 May: 23.1 µg/m³, 3.5× usualWilmington, 1 June: 15.8 µg/m³, 2.4× usualWilmington, 2 June: 18.3 µg/m³, 2.8× usualWilmington, 3 June: 19.3 µg/m³, 2.9× usualWilmington, 4 June: 7.2 µg/m³, 1.1× usualWilmington, 5 June: 8.8 µg/m³, 1.3× usualWilmington, 6 June: 45.2 µg/m³, 6.8× usualWilmington, 7 June: 170.0 µg/m³, 26× usualWilmington, 8 June: 169.5 µg/m³, 26× usualWilmington, 9 June: 26.2 µg/m³, 4.0× usualWilmington, 10 June: 22.1 µg/m³, 3.3× usualWilmington, 11 June: 30.0 µg/m³, 4.5× usualWilmington, 12 June: 19.3 µg/m³, 2.9× usualWilmington, 13 June: 9.8 µg/m³, 1.5× usualWilmington, 14 June: 9.5 µg/m³, 1.4× usualWilmington, 15 June: 9.5 µg/m³, 1.4× usualCarlisleCarlisle, 28 May: 7.2 µg/m³, 1.1× usualCarlisle, 29 May: 10.7 µg/m³, 1.7× usualCarlisle, 30 May: 11.1 µg/m³, 1.8× usualCarlisle, 31 May: 15.1 µg/m³, 2.4× usualCarlisle, 1 June: 14.8 µg/m³, 2.3× usualCarlisle, 2 June: 15.5 µg/m³, 2.5× usualCarlisle, 3 June: 15.3 µg/m³, 2.4× usualCarlisle, 4 June: 11.5 µg/m³, 1.8× usualCarlisle, 5 June: 11.2 µg/m³, 1.8× usualCarlisle, 6 June: 43.8 µg/m³, 7.0× usualCarlisle, 7 June: 123.0 µg/m³, 20× usualCarlisle, 8 June: 160.0 µg/m³, 25× usualCarlisle, 9 June: 24.4 µg/m³, 3.9× usualCarlisle, 10 June: 22.2 µg/m³, 3.5× usualCarlisle, 11 June: 26.1 µg/m³, 4.1× usualCarlisle, 12 June: 17.0 µg/m³, 2.7× usualCarlisle, 13 June: 9.9 µg/m³, 1.6× usualCarlisle, 14 June: 6.8 µg/m³, 1.1× usualCarlisle, 15 June: 8.2 µg/m³, 1.3× usualLindenLinden, 28 May: 10.0 µg/m³, 1.4× usualLinden, 29 May: 10.0 µg/m³, 1.4× usualLinden, 30 May: 12.1 µg/m³, 1.7× usualLinden, 31 May: 10.7 µg/m³, 1.5× usualLinden, 1 June: 14.0 µg/m³, 1.9× usualLinden, 2 June: 16.7 µg/m³, 2.3× usualLinden, 3 June: 10.7 µg/m³, 1.5× usualLinden, 4 June: 4.4 µg/m³, 0.6× usualLinden, 5 June: 10.3 µg/m³, 1.4× usualLinden, 6 June: 41.7 µg/m³, 5.7× usualLinden, 7 June: 147.0 µg/m³, 20× usualLinden, 8 June: 83.5 µg/m³, 11× usualLinden, 9 June: 10.2 µg/m³, 1.4× usualLinden, 10 June: 13.0 µg/m³, 1.8× usualLinden, 11 June: 24.7 µg/m³, 3.4× usualLinden, 12 June: 21.0 µg/m³, 2.9× usualLinden, 13 June: 6.3 µg/m³, 0.9× usualLinden, 14 June: 12.0 µg/m³, 1.6× usualLinden, 15 June: 6.5 µg/m³, 0.9× usualDanburyDanbury, 28 May: 7.6 µg/m³, 1.2× usualDanbury, 29 May: 9.1 µg/m³, 1.5× usualDanbury, 30 May: 17.9 µg/m³, 2.9× usualDanbury, 31 May: 10.0 µg/m³, 1.6× usualDanbury, 1 June: 16.1 µg/m³, 2.6× usualDanbury, 2 June: 12.7 µg/m³, 2.1× usualDanbury, 3 June: 9.0 µg/m³, 1.5× usualDanbury, 4 June: 3.9 µg/m³, 0.6× usualDanbury, 5 June: 7.1 µg/m³, 1.2× usualDanbury, 6 June: 69.9 µg/m³, 11× usualDanbury, 7 June: 130.0 µg/m³, 21× usualDanbury, 8 June: 68.1 µg/m³, 11× usualDanbury, 9 June: 9.8 µg/m³, 1.6× usualDanbury, 10 June: 9.4 µg/m³, 1.5× usualDanbury, 11 June: 24.1 µg/m³, 4.0× usualDanbury, 12 June: 22.0 µg/m³, 3.6× usualDanbury, 13 June: 5.8 µg/m³, 1.0× usualDanbury, 14 June: 8.1 µg/m³, 1.3× usualDanbury, 15 June: 5.6 µg/m³, 0.9× usualNew HavenNew Haven, 28 May: 7.0 µg/m³, 1.2× usualNew Haven, 29 May: 8.8 µg/m³, 1.5× usualNew Haven, 30 May: 12.1 µg/m³, 2.1× usualNew Haven, 31 May: 10.1 µg/m³, 1.7× usualNew Haven, 1 June: 16.8 µg/m³, 2.8× usualNew Haven, 2 June: 11.9 µg/m³, 2.0× usualNew Haven, 3 June: 9.7 µg/m³, 1.6× usualNew Haven, 4 June: 3.4 µg/m³, 0.6× usualNew Haven, 5 June: 3.2 µg/m³, 0.5× usualNew Haven, 6 June: 64.0 µg/m³, 11× usualNew Haven, 7 June: 127.0 µg/m³, 22× usualNew Haven, 8 June: 83.2 µg/m³, 14× usualNew Haven, 9 June: 20.2 µg/m³, 3.4× usualNew Haven, 10 June: 7.8 µg/m³, 1.3× usualNew Haven, 11 June: 24.0 µg/m³, 4.1× usualNew Haven, 12 June: 25.0 µg/m³, 4.2× usualNew Haven, 13 June: 7.4 µg/m³, 1.3× usualNew Haven, 14 June: 9.8 µg/m³, 1.7× usualNew Haven, 15 June: 5.5 µg/m³, 0.9× usualState CollegeState College, 28 May: 8.7 µg/m³, 1.5× usualState College, 29 May: 10.1 µg/m³, 1.7× usualState College, 30 May: 13.8 µg/m³, 2.3× usualState College, 31 May: 11.6 µg/m³, 2.0× usualState College, 1 June: 13.2 µg/m³, 2.2× usualState College, 2 June: 14.6 µg/m³, 2.5× usualState College, 3 June: 18.2 µg/m³, 3.1× usualState College, 4 June: 12.5 µg/m³, 2.1× usualState College, 5 June: 14.1 µg/m³, 2.4× usualState College, 6 June: 46.1 µg/m³, 7.8× usualState College, 7 June: 124.0 µg/m³, 21× usualState College, 8 June: 80.1 µg/m³, 14× usualState College, 9 June: 28.7 µg/m³, 4.9× usualState College, 10 June: 26.1 µg/m³, 4.4× usualState College, 11 June: 25.1 µg/m³, 4.3× usualState College, 12 June: 13.8 µg/m³, 2.3× usualState College, 13 June: 10.3 µg/m³, 1.7× usualState College, 14 June: 5.7 µg/m³, 1.0× usualState College, 15 June: 8.9 µg/m³, 1.5× usualPatersonPaterson, 28 May: 10.5 µg/m³, 1.4× usualPaterson, 29 May: 10.1 µg/m³, 1.3× usualPaterson, 30 May: 10.0 µg/m³, 1.3× usualPaterson, 31 May: 11.3 µg/m³, 1.5× usualPaterson, 1 June: no readingPaterson, 2 June: no readingPaterson, 3 June: no readingPaterson, 4 June: no readingPaterson, 5 June: no readingPaterson, 6 June: 51.6 µg/m³, 6.9× usualPaterson, 7 June: 122.0 µg/m³, 16× usualPaterson, 8 June: 70.8 µg/m³, 9.4× usualPaterson, 9 June: 7.4 µg/m³, 1.0× usualPaterson, 10 June: 11.4 µg/m³, 1.5× usualPaterson, 11 June: no readingPaterson, 12 June: no readingPaterson, 13 June: 6.3 µg/m³, 0.8× usualPaterson, 14 June: 10.5 µg/m³, 1.4× usualPaterson, 15 June: 7.1 µg/m³, 0.9× usualWhite PlainsWhite Plains, 28 May: 4.7 µg/m³, 0.9× usualWhite Plains, 29 May: 7.1 µg/m³, 1.4× usualWhite Plains, 30 May: 10.0 µg/m³, 2.0× usualWhite Plains, 31 May: 6.5 µg/m³, 1.3× usualWhite Plains, 1 June: 11.8 µg/m³, 2.4× usualWhite Plains, 2 June: 11.7 µg/m³, 2.3× usualWhite Plains, 3 June: 7.9 µg/m³, 1.6× usualWhite Plains, 4 June: 1.0 µg/m³, 0.2× usualWhite Plains, 5 June: 4.3 µg/m³, 0.9× usualWhite Plains, 6 June: 50.2 µg/m³, 10× usualWhite Plains, 7 June: 120.0 µg/m³, 24× usualWhite Plains, 8 June: 62.9 µg/m³, 13× usualWhite Plains, 9 June: 7.7 µg/m³, 1.5× usualWhite Plains, 10 June: 8.6 µg/m³, 1.7× usualWhite Plains, 11 June: 20.2 µg/m³, 4.0× usualWhite Plains, 12 June: 16.5 µg/m³, 3.3× usualWhite Plains, 13 June: 3.0 µg/m³, 0.6× usualWhite Plains, 14 June: 6.1 µg/m³, 1.2× usualWhite Plains, 15 June: 3.6 µg/m³, 0.7× usualNew CityNew City, 28 May: 6.6 µg/m³, 1.3× usualNew City, 29 May: 7.4 µg/m³, 1.5× usualNew City, 30 May: 9.4 µg/m³, 1.9× usualNew City, 31 May: 11.0 µg/m³, 2.2× usualNew City, 1 June: 10.7 µg/m³, 2.1× usualNew City, 2 June: 11.6 µg/m³, 2.3× usualNew City, 3 June: 6.8 µg/m³, 1.4× usualNew City, 4 June: 1.1 µg/m³, 0.2× usualNew City, 5 June: 14.1 µg/m³, 2.8× usualNew City, 6 June: 72.2 µg/m³, 14× usualNew City, 7 June: 119.0 µg/m³, 24× usualNew City, 8 June: 56.6 µg/m³, 11× usualNew City, 9 June: 3.2 µg/m³, 0.6× usualNew City, 10 June: 7.2 µg/m³, 1.4× usualNew City, 11 June: 19.1 µg/m³, 3.8× usualNew City, 12 June: 17.7 µg/m³, 3.5× usualNew City, 13 June: 3.2 µg/m³, 0.6× usualNew City, 14 June: 5.9 µg/m³, 1.2× usualNew City, 15 June: 4.3 µg/m³, 0.9× usualFort LeeFort Lee, 28 May: 4.9 µg/m³, 0.8× usualFort Lee, 29 May: 7.7 µg/m³, 1.2× usualFort Lee, 30 May: 10.1 µg/m³, 1.6× usualFort Lee, 31 May: 9.0 µg/m³, 1.5× usualFort Lee, 1 June: 13.4 µg/m³, 2.2× usualFort Lee, 2 June: 16.8 µg/m³, 2.7× usualFort Lee, 3 June: 9.1 µg/m³, 1.5× usualFort Lee, 4 June: 2.4 µg/m³, 0.4× usualFort Lee, 5 June: 7.8 µg/m³, 1.3× usualFort Lee, 6 June: 58.7 µg/m³, 9.5× usualFort Lee, 7 June: 119.0 µg/m³, 19× usualFort Lee, 8 June: 68.8 µg/m³, 11× usualFort Lee, 9 June: 4.5 µg/m³, 0.7× usualFort Lee, 10 June: 9.3 µg/m³, 1.5× usualFort Lee, 11 June: 23.4 µg/m³, 3.8× usualFort Lee, 12 June: 19.1 µg/m³, 3.1× usualFort Lee, 13 June: 4.5 µg/m³, 0.7× usualFort Lee, 14 June: 7.3 µg/m³, 1.2× usualFort Lee, 15 June: 5.2 µg/m³, 0.8× usualBaltimoreBaltimore, 28 May: 5.9 µg/m³, 0.9× usualBaltimore, 29 May: 8.6 µg/m³, 1.3× usualBaltimore, 30 May: no readingBaltimore, 31 May: no readingBaltimore, 1 June: no readingBaltimore, 2 June: no readingBaltimore, 3 June: 13.9 µg/m³, 2.1× usualBaltimore, 4 June: 6.9 µg/m³, 1.0× usualBaltimore, 5 June: 6.9 µg/m³, 1.0× usualBaltimore, 6 June: 27.9 µg/m³, 4.2× usualBaltimore, 7 June: 82.3 µg/m³, 12× usualBaltimore, 8 June: 117.0 µg/m³, 17× usualBaltimore, 9 June: 20.4 µg/m³, 3.0× usualBaltimore, 10 June: 15.9 µg/m³, 2.4× usualBaltimore, 11 June: 23.2 µg/m³, 3.5× usualBaltimore, 12 June: 13.8 µg/m³, 2.1× usualBaltimore, 13 June: 7.8 µg/m³, 1.2× usualBaltimore, 14 June: 8.0 µg/m³, 1.2× usualBaltimore, 15 June: 8.2 µg/m³, 1.2× usualHolbrookHolbrook, 28 May: 4.3 µg/m³, 0.8× usualHolbrook, 29 May: 6.6 µg/m³, 1.3× usualHolbrook, 30 May: 8.6 µg/m³, 1.7× usualHolbrook, 31 May: 10.3 µg/m³, 2.0× usualHolbrook, 1 June: 6.8 µg/m³, 1.3× usualHolbrook, 2 June: 6.2 µg/m³, 1.2× usualHolbrook, 3 June: 7.0 µg/m³, 1.4× usualHolbrook, 4 June: 1.3 µg/m³, 0.3× usualHolbrook, 5 June: 2.4 µg/m³, 0.5× usualHolbrook, 6 June: 41.8 µg/m³, 8.2× usualHolbrook, 7 June: 115.0 µg/m³, 23× usualHolbrook, 8 June: 65.7 µg/m³, 13× usualHolbrook, 9 June: 14.4 µg/m³, 2.8× usualHolbrook, 10 June: 15.5 µg/m³, 3.0× usualHolbrook, 11 June: 17.9 µg/m³, 3.5× usualHolbrook, 12 June: 15.7 µg/m³, 3.1× usualHolbrook, 13 June: 8.7 µg/m³, 1.7× usualHolbrook, 14 June: 4.1 µg/m³, 0.8× usualHolbrook, 15 June: 2.3 µg/m³, 0.5× usualBayonneBayonne, 28 May: 2.9 µg/m³, 0.6× usualBayonne, 29 May: 7.2 µg/m³, 1.4× usualBayonne, 30 May: 8.6 µg/m³, 1.7× usualBayonne, 31 May: 7.6 µg/m³, 1.5× usualBayonne, 1 June: 9.8 µg/m³, 2.0× usualBayonne, 2 June: 10.1 µg/m³, 2.0× usualBayonne, 3 June: 6.7 µg/m³, 1.3× usualBayonne, 4 June: 1.4 µg/m³, 0.3× usualBayonne, 5 June: 12.3 µg/m³, 2.5× usualBayonne, 6 June: 55.3 µg/m³, 11× usualBayonne, 7 June: 113.0 µg/m³, 23× usualBayonne, 8 June: 61.7 µg/m³, 12× usualBayonne, 9 June: 4.9 µg/m³, 1.0× usualBayonne, 10 June: 8.0 µg/m³, 1.6× usualBayonne, 11 June: 17.6 µg/m³, 3.5× usualBayonne, 12 June: 14.2 µg/m³, 2.8× usualBayonne, 13 June: 4.1 µg/m³, 0.8× usualBayonne, 14 June: 4.4 µg/m³, 0.9× usualBayonne, 15 June: 3.3 µg/m³, 0.7× usualEwingEwing, 28 May: 8.4 µg/m³, 1.0× usualEwing, 29 May: 11.1 µg/m³, 1.3× usualEwing, 30 May: no readingEwing, 31 May: 14.1 µg/m³, 1.7× usualEwing, 1 June: 14.0 µg/m³, 1.6× usualEwing, 2 June: 17.1 µg/m³, 2.0× usualEwing, 3 June: 17.0 µg/m³, 2.0× usualEwing, 4 June: 5.4 µg/m³, 0.6× usualEwing, 5 June: 10.1 µg/m³, 1.2× usualEwing, 6 June: 30.0 µg/m³, 3.5× usualEwing, 7 June: no readingEwing, 8 June: 113.0 µg/m³, 13× usualEwing, 9 June: 19.5 µg/m³, 2.3× usualEwing, 10 June: 15.8 µg/m³, 1.9× usualEwing, 11 June: 24.8 µg/m³, 2.9× usualEwing, 12 June: 17.2 µg/m³, 2.0× usualEwing, 13 June: 10.1 µg/m³, 1.2× usualEwing, 14 June: 10.6 µg/m³, 1.2× usualEwing, 15 June: 8.9 µg/m³, 1.0× usualJersey CityJersey City, 28 May: 6.3 µg/m³, 0.8× usualJersey City, 29 May: 9.1 µg/m³, 1.2× usualJersey City, 30 May: 10.0 µg/m³, 1.3× usualJersey City, 31 May: 9.8 µg/m³, 1.3× usualJersey City, 1 June: 14.0 µg/m³, 1.9× usualJersey City, 2 June: 16.1 µg/m³, 2.1× usualJersey City, 3 June: 10.3 µg/m³, 1.4× usualJersey City, 4 June: 3.9 µg/m³, 0.5× usualJersey City, 5 June: 8.7 µg/m³, 1.2× usualJersey City, 6 June: 51.3 µg/m³, 6.8× usualJersey City, 7 June: 110.5 µg/m³, 15× usualJersey City, 8 June: 66.3 µg/m³, 8.8× usualJersey City, 9 June: 8.2 µg/m³, 1.1× usualJersey City, 10 June: 9.8 µg/m³, 1.3× usualJersey City, 11 June: 23.0 µg/m³, 3.1× usualJersey City, 12 June: 19.0 µg/m³, 2.5× usualJersey City, 13 June: 5.9 µg/m³, 0.8× usualJersey City, 14 June: 7.9 µg/m³, 1.1× usualJersey City, 15 June: 6.5 µg/m³, 0.9× usualUticaUtica, 28 May: 6.5 µg/m³, 1.3× usualUtica, 29 May: 8.3 µg/m³, 1.7× usualUtica, 30 May: 6.9 µg/m³, 1.4× usualUtica, 31 May: 8.8 µg/m³, 1.8× usualUtica, 1 June: 11.4 µg/m³, 2.3× usualUtica, 2 June: 13.5 µg/m³, 2.7× usualUtica, 3 June: 9.4 µg/m³, 1.9× usualUtica, 4 June: 3.1 µg/m³, 0.6× usualUtica, 5 June: 23.2 µg/m³, 4.6× usualUtica, 6 June: 67.6 µg/m³, 14× usualUtica, 7 June: 109.0 µg/m³, 22× usualUtica, 8 June: 43.9 µg/m³, 8.8× usualUtica, 9 June: 4.1 µg/m³, 0.8× usualUtica, 10 June: 11.0 µg/m³, 2.2× usualUtica, 11 June: 14.7 µg/m³, 2.9× usualUtica, 12 June: 17.4 µg/m³, 3.5× usualUtica, 13 June: 4.5 µg/m³, 0.9× usualUtica, 14 June: 3.7 µg/m³, 0.7× usualUtica, 15 June: 6.5 µg/m³, 1.3× usualScaggsvilleScaggsville, 28 May: 5.2 µg/m³, 0.6× usualScaggsville, 29 May: 6.7 µg/m³, 0.8× usualScaggsville, 30 May: 16.0 µg/m³, 2.0× usualScaggsville, 31 May: 15.4 µg/m³, 1.9× usualScaggsville, 1 June: 22.2 µg/m³, 2.7× usualScaggsville, 2 June: 21.3 µg/m³, 2.6× usualScaggsville, 3 June: 14.2 µg/m³, 1.8× usualScaggsville, 4 June: 6.0 µg/m³, 0.7× usualScaggsville, 5 June: 5.1 µg/m³, 0.6× usualScaggsville, 6 June: 25.0 µg/m³, 3.1× usualScaggsville, 7 June: 66.2 µg/m³, 8.2× usualScaggsville, 8 June: 109.0 µg/m³, 13× usualScaggsville, 9 June: 20.4 µg/m³, 2.5× usualScaggsville, 10 June: 14.3 µg/m³, 1.8× usualScaggsville, 11 June: 20.0 µg/m³, 2.5× usualScaggsville, 12 June: 13.3 µg/m³, 1.6× usualScaggsville, 13 June: 7.6 µg/m³, 0.9× usualScaggsville, 14 June: 8.8 µg/m³, 1.1× usualScaggsville, 15 June: 6.1 µg/m³, 0.8× usualNewburghNewburgh, 28 May: 6.7 µg/m³, 1.3× usualNewburgh, 29 May: 7.6 µg/m³, 1.5× usualNewburgh, 30 May: 10.5 µg/m³, 2.1× usualNewburgh, 31 May: 12.7 µg/m³, 2.5× usualNewburgh, 1 June: 12.2 µg/m³, 2.4× usualNewburgh, 2 June: 12.3 µg/m³, 2.5× usualNewburgh, 3 June: 6.5 µg/m³, 1.3× usualNewburgh, 4 June: 1.3 µg/m³, 0.3× usualNewburgh, 5 June: 10.0 µg/m³, 2.0× usualNewburgh, 6 June: 59.5 µg/m³, 12× usualNewburgh, 7 June: 101.0 µg/m³, 20× usualNewburgh, 8 June: 56.9 µg/m³, 11× usualNewburgh, 9 June: 2.9 µg/m³, 0.6× usualNewburgh, 10 June: 15.6 µg/m³, 3.1× usualNewburgh, 11 June: 17.7 µg/m³, 3.5× usualNewburgh, 12 June: 16.6 µg/m³, 3.3× usualNewburgh, 13 June: no readingNewburgh, 14 June: 7.5 µg/m³, 1.5× usualNewburgh, 15 June: 3.2 µg/m³, 0.6× usualSaint MichaelSaint Michael, 28 May: 7.3 µg/m³, 1.4× usualSaint Michael, 29 May: 7.9 µg/m³, 1.5× usualSaint Michael, 30 May: 9.8 µg/m³, 1.8× usualSaint Michael, 31 May: 7.6 µg/m³, 1.4× usualSaint Michael, 1 June: 8.5 µg/m³, 1.6× usualSaint Michael, 2 June: 12.2 µg/m³, 2.3× usualSaint Michael, 3 June: 12.8 µg/m³, 2.4× usualSaint Michael, 4 June: 16.3 µg/m³, 3.0× usualSaint Michael, 5 June: 21.7 µg/m³, 4.0× usualSaint Michael, 6 June: 35.8 µg/m³, 6.6× usualSaint Michael, 7 June: 13.7 µg/m³, 2.5× usualSaint Michael, 8 June: 11.0 µg/m³, 2.0× usualSaint Michael, 9 June: 17.7 µg/m³, 3.3× usualSaint Michael, 10 June: 12.9 µg/m³, 2.4× usualSaint Michael, 11 June: 5.8 µg/m³, 1.1× usualSaint Michael, 12 June: 10.0 µg/m³, 1.9× usualSaint Michael, 13 June: 9.5 µg/m³, 1.8× usualSaint Michael, 14 June: 100.0 µg/m³, 19× usualSaint Michael, 15 June: 40.4 µg/m³, 7.5× usualSaint CloudSaint Cloud, 28 May: 8.0 µg/m³, 1.6× usualSaint Cloud, 29 May: 8.1 µg/m³, 1.6× usualSaint Cloud, 30 May: 8.6 µg/m³, 1.7× usualSaint Cloud, 31 May: 7.7 µg/m³, 1.5× usualSaint Cloud, 1 June: 8.4 µg/m³, 1.6× usualSaint Cloud, 2 June: 11.1 µg/m³, 2.2× usualSaint Cloud, 3 June: 12.1 µg/m³, 2.4× usualSaint Cloud, 4 June: 15.4 µg/m³, 3.0× usualSaint Cloud, 5 June: 21.1 µg/m³, 4.1× usualSaint Cloud, 6 June: 36.3 µg/m³, 7.1× usualSaint Cloud, 7 June: 13.2 µg/m³, 2.6× usualSaint Cloud, 8 June: 10.5 µg/m³, 2.1× usualSaint Cloud, 9 June: 17.0 µg/m³, 3.3× usualSaint Cloud, 10 June: 14.0 µg/m³, 2.7× usualSaint Cloud, 11 June: 7.7 µg/m³, 1.5× usualSaint Cloud, 12 June: 9.7 µg/m³, 1.9× usualSaint Cloud, 13 June: 9.5 µg/m³, 1.9× usualSaint Cloud, 14 June: 99.5 µg/m³, 20× usualSaint Cloud, 15 June: 29.3 µg/m³, 5.7× usualHunt ValleyHunt Valley, 28 May: 3.6 µg/m³, 0.5× usualHunt Valley, 29 May: 6.6 µg/m³, 1.0× usualHunt Valley, 30 May: 10.1 µg/m³, 1.5× usualHunt Valley, 31 May: 14.9 µg/m³, 2.2× usualHunt Valley, 1 June: 16.0 µg/m³, 2.4× usualHunt Valley, 2 June: 15.5 µg/m³, 2.3× usualHunt Valley, 3 June: 11.5 µg/m³, 1.7× usualHunt Valley, 4 June: 5.3 µg/m³, 0.8× usualHunt Valley, 5 June: 5.5 µg/m³, 0.8× usualHunt Valley, 6 June: 25.4 µg/m³, 3.7× usualHunt Valley, 7 June: 66.3 µg/m³, 9.8× usualHunt Valley, 8 June: 98.5 µg/m³, 14× usualHunt Valley, 9 June: 19.8 µg/m³, 2.9× usualHunt Valley, 10 June: 16.2 µg/m³, 2.4× usualHunt Valley, 11 June: 22.1 µg/m³, 3.3× usualHunt Valley, 12 June: 10.5 µg/m³, 1.5× usualHunt Valley, 13 June: 6.1 µg/m³, 0.9× usualHunt Valley, 14 June: 6.6 µg/m³, 1.0× usualHunt Valley, 15 June: 7.7 µg/m³, 1.1× usualWaterburyWaterbury, 28 May: 7.8 µg/m³, 1.3× usualWaterbury, 29 May: 8.7 µg/m³, 1.5× usualWaterbury, 30 May: 10.9 µg/m³, 1.8× usualWaterbury, 31 May: 10.3 µg/m³, 1.7× usualWaterbury, 1 June: 17.1 µg/m³, 2.9× usualWaterbury, 2 June: 14.0 µg/m³, 2.3× usualWaterbury, 3 June: 9.2 µg/m³, 1.5× usualWaterbury, 4 June: 3.8 µg/m³, 0.6× usualWaterbury, 5 June: 5.6 µg/m³, 0.9× usualWaterbury, 6 June: 58.2 µg/m³, 9.7× usualWaterbury, 7 June: 96.5 µg/m³, 16× usualWaterbury, 8 June: 75.4 µg/m³, 13× usualWaterbury, 9 June: 11.5 µg/m³, 1.9× usualWaterbury, 10 June: 6.2 µg/m³, 1.0× usualWaterbury, 11 June: 20.3 µg/m³, 3.4× usualWaterbury, 12 June: 25.2 µg/m³, 4.2× usualWaterbury, 13 June: 6.4 µg/m³, 1.1× usualWaterbury, 14 June: 9.3 µg/m³, 1.6× usualWaterbury, 15 June: 6.0 µg/m³, 1.0× usualCornwallCornwall, 28 May: 5.9 µg/m³, 1.0× usualCornwall, 29 May: 7.1 µg/m³, 1.2× usualCornwall, 30 May: 9.8 µg/m³, 1.7× usualCornwall, 31 May: 12.3 µg/m³, 2.2× usualCornwall, 1 June: 14.6 µg/m³, 2.6× usualCornwall, 2 June: 16.5 µg/m³, 2.9× usualCornwall, 3 June: 7.3 µg/m³, 1.3× usualCornwall, 4 June: 5.9 µg/m³, 1.0× usualCornwall, 5 June: 11.8 µg/m³, 2.1× usualCornwall, 6 June: 93.5 µg/m³, 16× usualCornwall, 7 June: 82.9 µg/m³, 15× usualCornwall, 8 June: 4.0 µg/m³, 0.7× usualCornwall, 9 June: 5.1 µg/m³, 0.9× usualCornwall, 10 June: 6.5 µg/m³, 1.1× usualCornwall, 11 June: 16.9 µg/m³, 3.0× usualCornwall, 12 June: 20.3 µg/m³, 3.6× usualCornwall, 13 June: 10.6 µg/m³, 1.9× usualCornwall, 14 June: 10.9 µg/m³, 1.9× usualCornwall, 15 June: 14.6 µg/m³, 2.6× usualToms RiverToms River, 28 May: 7.4 µg/m³, 1.1× usualToms River, 29 May: 9.4 µg/m³, 1.4× usualToms River, 30 May: 8.4 µg/m³, 1.2× usualToms River, 31 May: 19.8 µg/m³, 2.9× usualToms River, 1 June: 8.2 µg/m³, 1.2× usualToms River, 2 June: 11.6 µg/m³, 1.7× usualToms River, 3 June: 9.3 µg/m³, 1.4× usualToms River, 4 June: 3.9 µg/m³, 0.6× usualToms River, 5 June: 5.8 µg/m³, 0.9× usualToms River, 6 June: no readingToms River, 7 June: 186.0 µg/m³, 27× usualToms River, 8 June: 119.0 µg/m³, 18× usualToms River, 9 June: 24.3 µg/m³, 3.6× usualToms River, 10 June: 14.8 µg/m³, 2.2× usualToms River, 11 June: 22.4 µg/m³, 3.3× usualToms River, 12 June: 17.0 µg/m³, 2.5× usualToms River, 13 June: 5.3 µg/m³, 0.8× usualToms River, 14 June: 8.0 µg/m³, 1.2× usualToms River, 15 June: 7.1 µg/m³, 1.0× usualTrentonTrenton, 28 May: 7.1 µg/m³, 0.9× usualTrenton, 29 May: 11.7 µg/m³, 1.5× usualTrenton, 30 May: 11.8 µg/m³, 1.5× usualTrenton, 31 May: 14.9 µg/m³, 1.9× usualTrenton, 1 June: 15.4 µg/m³, 2.0× usualTrenton, 2 June: 18.4 µg/m³, 2.4× usualTrenton, 3 June: no readingTrenton, 4 June: no readingTrenton, 5 June: no readingTrenton, 6 June: no readingTrenton, 7 June: 170.0 µg/m³, 22× usualTrenton, 8 June: 97.5 µg/m³, 13× usualTrenton, 9 June: 15.1 µg/m³, 2.0× usualTrenton, 10 June: 16.5 µg/m³, 2.1× usualTrenton, 11 June: 24.7 µg/m³, 3.2× usualTrenton, 12 June: 18.3 µg/m³, 2.4× usualTrenton, 13 June: 6.8 µg/m³, 0.9× usualTrenton, 14 June: 10.4 µg/m³, 1.4× usualTrenton, 15 June: 8.1 µg/m³, 1.1× usualElizabethElizabeth, 28 May: 10.3 µg/m³, 1.2× usualElizabeth, 29 May: 17.0 µg/m³, 2.0× usualElizabeth, 30 May: 17.2 µg/m³, 2.0× usualElizabeth, 31 May: 12.7 µg/m³, 1.5× usualElizabeth, 1 June: no readingElizabeth, 2 June: no readingElizabeth, 3 June: no readingElizabeth, 4 June: no readingElizabeth, 5 June: no readingElizabeth, 6 June: no readingElizabeth, 7 June: 151.0 µg/m³, 17× usualElizabeth, 8 June: 99.6 µg/m³, 11× usualElizabeth, 9 June: 14.4 µg/m³, 1.7× usualElizabeth, 10 June: 13.3 µg/m³, 1.5× usualElizabeth, 11 June: 29.7 µg/m³, 3.4× usualElizabeth, 12 June: 24.3 µg/m³, 2.8× usualElizabeth, 13 June: 13.3 µg/m³, 1.5× usualElizabeth, 14 June: 12.9 µg/m³, 1.5× usualElizabeth, 15 June: no readingEdgewoodEdgewood, 28 May: 6.2 µg/m³, 1.1× usualEdgewood, 29 May: 7.7 µg/m³, 1.3× usualEdgewood, 30 May: no readingEdgewood, 31 May: no readingEdgewood, 1 June: no readingEdgewood, 2 June: 17.4 µg/m³, 3.0× usualEdgewood, 3 June: 12.7 µg/m³, 2.2× usualEdgewood, 4 June: 5.0 µg/m³, 0.9× usualEdgewood, 5 June: 5.3 µg/m³, 0.9× usualEdgewood, 6 June: 22.9 µg/m³, 3.9× usualEdgewood, 7 June: 71.8 µg/m³, 12× usualEdgewood, 8 June: 126.0 µg/m³, 22× usualEdgewood, 9 June: 24.0 µg/m³, 4.1× usualEdgewood, 10 June: 14.5 µg/m³, 2.5× usualEdgewood, 11 June: 23.5 µg/m³, 4.1× usualEdgewood, 12 June: 15.0 µg/m³, 2.6× usualEdgewood, 13 June: 7.0 µg/m³, 1.2× usualEdgewood, 14 June: 7.7 µg/m³, 1.3× usualEdgewood, 15 June: 8.4 µg/m³, 1.4× usualSouth LaurelSouth Laurel, 28 May: 3.9 µg/m³, 0.6× usualSouth Laurel, 29 May: 4.4 µg/m³, 0.7× usualSouth Laurel, 30 May: 12.6 µg/m³, 2.1× usualSouth Laurel, 31 May: 15.7 µg/m³, 2.6× usualSouth Laurel, 1 June: 22.5 µg/m³, 3.7× usualSouth Laurel, 2 June: 21.6 µg/m³, 3.5× usualSouth Laurel, 3 June: 12.8 µg/m³, 2.1× usualSouth Laurel, 4 June: 5.3 µg/m³, 0.9× usualSouth Laurel, 5 June: 4.5 µg/m³, 0.7× usualSouth Laurel, 6 June: 24.1 µg/m³, 4.0× usualSouth Laurel, 7 June: 66.2 µg/m³, 11× usualSouth Laurel, 8 June: 116.0 µg/m³, 19× usualSouth Laurel, 9 June: 18.3 µg/m³, 3.0× usualSouth Laurel, 10 June: 11.8 µg/m³, 1.9× usualSouth Laurel, 11 June: 18.3 µg/m³, 3.0× usualSouth Laurel, 12 June: 9.9 µg/m³, 1.6× usualSouth Laurel, 13 June: 5.1 µg/m³, 0.8× usualSouth Laurel, 14 June: 5.8 µg/m³, 1.0× usualSouth Laurel, 15 June: 6.1 µg/m³, 1.0× usualNew BrunswickNew Brunswick, 28 May: 6.4 µg/m³, 0.9× usualNew Brunswick, 29 May: 10.3 µg/m³, 1.5× usualNew Brunswick, 30 May: 13.2 µg/m³, 1.9× usualNew Brunswick, 31 May: 9.9 µg/m³, 1.4× usualNew Brunswick, 1 June: 14.5 µg/m³, 2.1× usualNew Brunswick, 2 June: 17.3 µg/m³, 2.5× usualNew Brunswick, 3 June: 16.2 µg/m³, 2.3× usualNew Brunswick, 4 June: 4.5 µg/m³, 0.6× usualNew Brunswick, 5 June: 8.8 µg/m³, 1.3× usualNew Brunswick, 6 June: no readingNew Brunswick, 7 June: no readingNew Brunswick, 8 June: 112.0 µg/m³, 16× usualNew Brunswick, 9 June: 14.7 µg/m³, 2.1× usualNew Brunswick, 10 June: 14.2 µg/m³, 2.0× usualNew Brunswick, 11 June: 28.0 µg/m³, 4.0× usualNew Brunswick, 12 June: 20.7 µg/m³, 3.0× usualNew Brunswick, 13 June: 6.1 µg/m³, 0.9× usualNew Brunswick, 14 June: 10.1 µg/m³, 1.4× usualNew Brunswick, 15 June: 8.1 µg/m³, 1.2× usual28 May301 Jun3579111315
The 60 cities with the highest readings of 260, in the order the episode reached them, 3 days before to 3 after. Each square is a day, coloured by that day's PM2.5; outlined: at twice the city's usual or more.
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

Every city it reached

CityDaysHighestUsualAbove usual
Rouyn-NorandaQuebec, Canada3 218.04 June5.044×
BethlehemPennsylvania, United States3 253.07 June6.141×
KingstonOntario, Canada5 210.07 June5.240×
OttawaOntario, Canada3 208.07 June5.439×
AllentownPennsylvania, United States3 239.07 June6.437×
SyracuseNew York, United States3 181.07 June5.235×
ElktonMaryland, United States5 185.08 June5.732×
ScrantonPennsylvania, United States3 215.07 June6.931×
ReadingPennsylvania, United States3 204.07 June6.631×
BellevilleOntario, Canada6 155.07 June5.230×
NorristownPennsylvania, United States4 202.07 June6.830×
BearDelaware, United States5 181.08 June6.130×
ChesterPennsylvania, United States6 181.07 June6.329×
Toms RiverNew Jersey, United States2 186.07 June6.827×
PennsaukenNew Jersey, United States4 204.07 June7.627×
YorkPennsylvania, United States5 193.08 June7.227×
HarrisburgPennsylvania, United States4 195.08 June7.526×
BridgeportConnecticut, United States6 165.07 June6.426×
WilmingtonDelaware, United States5 170.07 June6.626×
CarlislePennsylvania, United States4 160.08 June6.325×
LancasterPennsylvania, United States4 172.08 June6.825×
LebanonPennsylvania, United States4 181.07 June7.325×
White PlainsNew York, United States3 120.07 June3.924×
New CityNew York, United States3 119.07 June3.924×
PleasantvilleNew Jersey, United States6 148.08 June6.523×
New York CityNew York, United States4 170.07 June7.523×
BayonneNew Jersey, United States3 113.07 June3.923×
HolbrookNew York, United States3 115.07 June5.123×
NewarkDelaware, United States5 148.58 June6.722×
TrentonNew Jersey, United States2 170.07 June7.722×
Rose HillVirginia, United States6 149.08 June6.822×
UticaNew York, United States3 109.07 June4.622×
EdgewoodMaryland, United States2 126.08 June5.822×
New HavenConnecticut, United States4 127.07 June5.922×
DanburyConnecticut, United States3 130.07 June6.121×
State CollegePennsylvania, United States6 124.07 June5.921×
South VinelandNew Jersey, United States3 136.08 June6.521×
DoverDelaware, United States6 132.08 June6.520×
NewburghNew York, United States3 101.07 June4.020×
LindenNew Jersey, United States3 147.07 June7.320×
Saint CloudMinnesota, United States1 99.514 June5.120×
Fort LeeNew Jersey, United States3 119.07 June6.219×
South LaurelMaryland, United States2 116.08 June6.119×
Saint MichaelMinnesota, United States1 100.014 June5.419×
SpringfieldVirginia, United States6 128.08 June7.118×
Saint PaulMinnesota, United States2 105.014 June5.918×
BaltimoreMaryland, United States3 117.08 June6.717×
ElizabethNew Jersey, United States3 151.07 June8.717×
MinneapolisMinnesota, United States2 105.014 June6.217×
BlaineMinnesota, United States1 84.814 June5.117×
AlbanyNew York, United States5 102.07 June6.216×
CornwallOntario, Canada2 93.56 June5.716×
PatersonNew Jersey, United States3 122.07 June7.516×
WaterburyConnecticut, United States4 96.57 June6.016×
New BrunswickNew Jersey, United States2 112.08 June7.016×
BurnsvilleMinnesota, United States2 95.514 June6.116×
Apple ValleyMinnesota, United States2 84.514 June5.416×
RochesterNew York, United States4 88.07 June5.715×
WashingtonDistrict of Columbia, United States5 115.58 June7.515×
ShakopeeMinnesota, United States2 89.014 June5.815×
PittsfieldMassachusetts, United States3 80.97 June5.315×
AppletonWisconsin, United States2 79.84 June5.415×
Jersey CityNew Jersey, United States3 110.57 June7.515×
Hunt ValleyMaryland, United States3 98.58 June6.814×
New LondonConnecticut, United States5 76.58 June5.314×
PeterboroughOntario, Canada5 71.75 June5.114×
Greater SudburyOntario, Canada7 78.33 June5.614×
Green BayWisconsin, United States2 75.94 June5.514×
ScaggsvilleMaryland, United States3 109.08 June8.113×
AltoonaPennsylvania, United States3 73.37 June5.513×
EwingNew Jersey, United States2 113.08 June8.513×
East HamptonVirginia, United States5 88.97 June6.713×
HagerstownMaryland, United States2 65.88 June4.813×
HartfordConnecticut, United States4 74.47 June5.913×
BuffaloNew York, United States7 91.77 June7.313×
RockvilleMaryland, United States2 72.88 June5.813×
DuluthMinnesota, United States1 62.214 June4.712×
Eau ClaireWisconsin, United States3 68.15 June5.512×
North ChicopeeMassachusetts, United States3 61.88 June4.812×
CharlottesvilleVirginia, United States6 76.28 June6.811×
SuperiorWisconsin, United States1 58.914 June5.411×
ChesapeakeVirginia, United States5 78.87 June7.311×
WorcesterMassachusetts, United States3 53.36 June5.310×
SarniaOntario, Canada6 62.37 June6.39.9×
Port HuronMichigan, United States6 61.97 June6.39.8×
Fall RiverMassachusetts, United States5 47.96 June4.89.6×
ChathamOntario, Canada5 56.37 June5.99.5×
HempsteadNew York, United States1 47.36 June4.59.5×
GreenfieldMassachusetts, United States4 48.56 June5.39.2×
St. ThomasOntario, Canada6 61.27 June6.89.0×
TaylorMichigan, United States5 58.17 June6.58.9×
Lincoln ParkMichigan, United States8 63.97 June7.28.9×
North BayOntario, Canada4 44.19 June5.08.8×
MolineIllinois, United States2 49.915 June5.78.8×
LondonOntario, Canada6 60.07 June6.98.7×
ClintonIowa, United States1 56.015 June6.58.6×
RichmondVirginia, United States6 55.57 June6.58.5×
SpringfieldMassachusetts, United States2 51.48 June6.18.4×
YpsilantiMichigan, United States5 54.78 June6.58.4×
KenmoreNew York, United States4 50.07 June6.08.3×
DetroitMichigan, United States6 64.97 June7.88.3×
Shaker HeightsOhio, United States3 51.07 June6.28.2×
RochesterMinnesota, United States3 55.515 June6.88.2×
MadisonWisconsin, United States3 44.04 June5.58.0×
LansingMichigan, United States5 55.08 June6.98.0×
St. CatharinesOntario, Canada7 50.97 June6.48.0×
DavenportIowa, United States1 49.015 June6.27.9×
Iowa CityIowa, United States1 46.315 June5.97.8×
Fort ThomasKentucky, United States3 45.17 June5.87.8×
MedinaOhio, United States3 48.67 June6.37.7×
MontréalQuebec, Canada1 47.66 June6.27.7×
HopewellVirginia, United States6 44.87 June6.07.5×
CoventryRhode Island, United States3 37.26 June3.47.4×
Sault Ste. MarieOntario, Canada1 40.55 June5.57.4×
DublinOhio, United States6 50.87 June6.97.4×
DearbornMichigan, United States6 59.57 June8.17.3×
GahannaOhio, United States3 36.87 June5.17.2×
KitchenerOntario, Canada7 52.56 June7.37.2×
ShawiniganQuebec, Canada1 41.46 June5.97.0×
AndersonIndiana, United States6 43.77 June6.36.9×
ProvidenceRhode Island, United States3 34.66 June4.66.9×
WaukeshaWisconsin, United States3 43.44 June6.36.9×
BloomingtonIndiana, United States4 43.36 June6.36.9×
DorvalQuebec, Canada1 42.66 June6.26.9×
WaterlooIowa, United States2 51.315 June7.56.8×
JenisonMichigan, United States3 45.18 June6.66.8×
Saint-Jean-sur-RichelieuQuebec, Canada1 34.16 June4.76.8×
BrocktonMassachusetts, United States2 39.56 June5.86.8×
Rivière-des-Prairies–Pointe-aux-TremblesQuebec, Canada1 38.56 June5.76.8×
BarrieOntario, Canada6 48.16 June7.26.7×
AkronOhio, United States5 48.67 June7.36.7×
ZionIllinois, United States1 36.54 June5.56.6×
South MilwaukeeWisconsin, United States3 39.74 June6.16.5×
ClevelandOhio, United States5 54.97 June8.56.5×
RaleighNorth Carolina, United States4 46.99 June7.46.3×
DaytonOhio, United States6 49.47 June7.86.3×
ElizabethtownKentucky, United States6 37.19 June5.96.3×
BrantfordOntario, Canada7 48.37 June7.86.2×
NorwoodOhio, United States4 49.87 June8.16.1×
Bay CityMichigan, United States4 42.77 June7.06.1×
MasonOhio, United States2 37.77 June6.26.1×
BurlingtonVermont, United States1 36.06 June6.06.0×
Saint MatthewsKentucky, United States5 39.515 June6.66.0×
JeffersontownKentucky, United States5 39.315 June6.66.0×
MilwaukeeWisconsin, United States3 43.94 June7.45.9×
CincinnatiOhio, United States3 46.27 June7.85.9×
Weirton HeightsWest Virginia, United States4 36.06 June6.15.9×
FlintMichigan, United States4 41.37 June7.05.9×
RutlandVermont, United States1 32.46 June5.55.9×
Lexington-FayetteKentucky, United States4 33.28 June5.75.8×
BrossardQuebec, Canada1 35.56 June6.15.8×
JohnstownPennsylvania, United States3 34.76 June6.05.8×
JeffersonvilleIndiana, United States6 43.815 June7.65.8×
EriePennsylvania, United States6 35.67 June6.25.7×
Grand RapidsMichigan, United States4 41.38 June7.25.7×
MiddletownOhio, United States6 52.57 June9.25.7×
YoungstownOhio, United States5 38.68 June6.95.6×
CheektowagaNew York, United States4 53.17 June9.65.5×
AshlandKentucky, United States4 38.57 June7.05.5×
RockfordIllinois, United States1 36.315 June6.75.4×
CantonOhio, United States6 47.38 June8.85.4×
Winston-SalemNorth Carolina, United States4 40.36 June7.55.4×
HaverhillMassachusetts, United States1 27.312 June5.15.4×
SpringfieldOhio, United States6 43.77 June8.25.3×
IndianapolisIndiana, United States6 44.87 June8.55.3×
KeeneNew Hampshire, United States1 26.76 June5.15.2×
HamiltonOntario, Canada6 41.27 June7.95.2×
TorontoOntario, Canada2 34.96 June6.75.2×
QuincyMassachusetts, United States2 27.512 June5.35.2×
LouisvilleKentucky, United States5 39.815 June7.75.2×
PainesvilleOhio, United States3 31.07 June6.05.2×
WarrenOhio, United States6 41.87 June8.15.2×
LebanonOhio, United States2 35.37 June6.95.1×
WilkinsburgPennsylvania, United States6 37.36 June7.35.1×
LowellMassachusetts, United States2 29.612 June5.85.1×
ClemmonsNorth Carolina, United States4 37.66 June7.45.1×
ColumbusIndiana, United States3 35.56 June7.05.1×
BensalemPennsylvania, United States6 40.56 June8.05.1×
DerryNew Hampshire, United States1 25.312 June5.05.1×
ToledoOhio, United States4 38.77 June7.75.0×
BloomingtonIllinois, United States1 30.64 June6.15.0×
White OakOhio, United States3 31.47 June6.35.0×
ConwaySouth Carolina, United States2 30.610 June6.24.9×
RoanokeVirginia, United States4 30.07 June6.14.9×
PittsburghPennsylvania, United States5 35.66 June7.34.9×
LynnMassachusetts, United States1 27.712 June5.74.9×
RedfordMichigan, United States4 44.07 June9.24.8×
BostonMassachusetts, United States2 29.612 June6.24.8×
KalamazooMichigan, United States5 37.76 June7.94.8×
PortsmouthNew Hampshire, United States1 27.112 June5.84.7×
South BendIndiana, United States3 33.26 June7.24.6×
New AlbanyIndiana, United States1 27.915 June6.14.6×
HernandoMississippi, United States4 33.87 June7.44.6×
DecaturIllinois, United States3 32.84 June7.24.6×
McKeesportPennsylvania, United States4 31.86 June7.04.5×
GranbyQuebec, Canada1 25.36 June5.64.5×
East Saint LouisIllinois, United States4 35.86 June8.14.4×
West MifflinPennsylvania, United States6 40.26 June9.14.4×
FishersIndiana, United States2 31.27 June7.14.4×
ClaytonNorth Carolina, United States4 35.89 June8.24.4×
PhiladelphiaPennsylvania, United States3 36.26 June8.44.3×
GreenvilleNorth Carolina, United States3 30.57 June7.14.3×
MorrisvilleNorth Carolina, United States5 34.79 June8.14.3×
CharlestonWest Virginia, United States3 29.08 June6.84.3×
SteubenvilleOhio, United States5 35.16 June8.34.2×
OwensboroKentucky, United States5 37.68 June8.94.2×
Valley StationKentucky, United States7 34.015 June8.14.2×
KnoxvilleTennessee, United States3 32.37 June7.74.2×
CaryIllinois, United States2 28.815 June6.94.2×
SpringdaleArkansas, United States2 39.16 June9.44.2×
OlatheKansas, United States1 26.26 June6.34.2×
Des MoinesIowa, United States2 29.56 June7.24.1×
Kansas CityKansas, United States1 27.56 June6.84.0×
LimaOhio, United States3 36.77 June9.14.0×
North CharlestonSouth Carolina, United States2 32.210 June8.04.0×
Calumet CityIllinois, United States2 30.76 June7.74.0×
KokomoIndiana, United States5 27.49 June6.94.0×
AthensGeorgia, United States2 27.310 June6.94.0×
East ChicagoIndiana, United States2 28.06 June7.23.9×
EvansvilleIndiana, United States4 31.77 June8.23.9×
AnkenyIowa, United States2 30.56 June7.93.9×
FayettevilleNorth Carolina, United States2 32.87 June8.53.9×
NorthbrookIllinois, United States1 26.64 June6.93.9×
HollandMichigan, United States1 28.66 June7.53.8×
LafayetteIndiana, United States1 26.46 June7.03.8×
SpringfieldIllinois, United States1 27.04 June7.23.8×
SavannahGeorgia, United States1 25.510 June6.83.8×
NapervilleIllinois, United States3 29.215 June7.83.7×
PaducahKentucky, United States4 26.59 June7.13.7×
HammondIndiana, United States2 28.76 June7.73.7×
DurhamNorth Carolina, United States1 27.29 June7.33.7×
ElkhartIndiana, United States2 28.26 June7.63.7×
AugustaGeorgia, United States2 28.410 June7.73.7×
Des PlainesIllinois, United States2 26.16 June7.13.7×
MaryvilleTennessee, United States1 28.27 June7.73.7×
LexingtonNorth Carolina, United States2 30.77 June8.43.7×
JolietIllinois, United States2 27.76 June7.63.6×
La CrosseWisconsin, United States2 58.95 June16.23.6×
TrussvilleAlabama, United States1 27.110 June7.53.6×
HendersonvilleTennessee, United States2 27.07 June7.53.6×
HuntsvilleAlabama, United States1 25.110 June7.03.6×
BirminghamAlabama, United States3 32.89 June9.23.6×
Roanoke RapidsNorth Carolina, United States3 29.39 June8.33.5×
Phenix CityAlabama, United States2 28.19 June8.03.5×
FlorenceSouth Carolina, United States3 29.79 June8.53.5×
GreenvilleSouth Carolina, United States1 26.47 June7.63.5×
LawrencevilleGeorgia, United States2 29.010 June8.43.5×
GreensboroNorth Carolina, United States1 27.26 June7.93.4×
ChattanoogaTennessee, United States3 32.09 June9.33.4×
CharlotteNorth Carolina, United States1 27.17 June8.03.4×
Saint AndrewsSouth Carolina, United States2 27.89 June8.33.3×
St. LouisMissouri, United States4 32.16 June9.73.3×
SpartanburgSouth Carolina, United States2 29.47 June9.13.2×
East RidgeTennessee, United States3 30.810 June9.73.2×
GainesvilleGeorgia, United States3 30.010 June9.63.1×
HueytownAlabama, United States1 25.09 June8.13.1×
BartlettTennessee, United States2 26.57 June8.73.0×
Terre HauteIndiana, United States2 30.76 June10.33.0×
MaconGeorgia, United States2 26.39 June8.93.0×
Little RockArkansas, United States2 28.67 June10.22.8×

Daily means in µg/m³. Usual: the city's median for this time of year (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that.

Against other episodes in the United States and Canada

Number 2 of 45 episodes in the United States and Canada since our records began, by cities reached.

Bars: cities reached; colour: the level of the episode's highest daily reading. All 45.

Use this page

SmogRank, North-eastern United States and Canada, May and June 2023: 260 cities with PM2.5 at twice their usual or more, 31 May to 12 June 2023, smogrank.com/episodes/2023-05-north-eastern-united-states-and-canada (accessed 2 October 2026).

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You're welcome to reuse a single chart, image or figure with this citation and a link. Terms.

An episode is a run of days when many cities close to each other (four or more within 350 km on a day, 8 or more in all) each had a daily PM2.5 mean of at least 25 µg/m³ and at least 2 times their usual for that time of year. Found in our own measurements, not picked by hand. How we find episodes. Values are each city's daily mean of its own monitors; causes are the usual kinds for a pattern like this, not a confirmed source.