SmogRank / Episodes / United States

Eastern United States and Canada, May and June 2023

For 13 days, from 31 May to 12 June 2023, 261 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 reached261in 2 countries
Days1331 May to 12 June 2023
Worst day6 June198 cities counted
Furthest above usual42×Bethlehem

Day by day

6 June 198 cities at twice their usual or more
HermitageKingsportAshevillePortageHickoryGaryCookevilleChicagoOak LawnFranklin ParkClarksvilleColumbiaCandler-McAfeeAtlantaMcDonoughGadsdenDecaturGranite CityJacksonWarner RobinsLemayUniversity CityDyersburgArnoldMuscatineMontgomeryAlbanyWest MemphisBrunswickValdostaJacksonSpringfieldHattiesburgLibertyRaymoreDrummondvilleLaconiaKansas CityTrois-RivièresSaint JosephFort SmithTopekaPortlandTexarkanaBellevueLewistonOmahaL'Ancienne-LoretteQuébecShreveportTulsaJenksLincolnMcAlesterSaguenaySioux FallsAdaCorsicanaLittle RockMaconBartlettTerre HauteHueytownGainesvilleSpartanburgEast RidgeSaint AndrewsSt. LouisCharlotteGreensboroChattanoogaGreenvillePhenix CityLawrencevilleFlorenceHuntsvilleHendersonvilleTrussvilleJolietNapervilleRoanoke RapidsBirminghamLa CrosseDes PlainesPaducahDurhamMaryvilleElkhartAugustaHammondLexingtonSavannahCaryLafayetteSpringfieldHollandValley StationNorthbrookEast ChicagoAnkenyEvansvilleFayettevilleAthensKokomoKansas CityCalumet CityNorth CharlestonLimaNew AlbanyDes MoinesIowa CityOlatheKnoxvilleSteubenvilleOwensboroSpringdaleCharlestonGreenvilleMorrisvillePhiladelphiaDavenportFishersLouisvilleClaytonEast Saint LouisWest MifflinGranbySaint MatthewsMcKeesportDecaturSouth BendHernandoPortsmouthWaterlooBostonKalamazooRedfordLynnRoanokeConwayClintonPittsburghBloomingtonWhite OakToledoDerryLowellBurnsvilleMinneapolisLebanonColumbusClemmonsBensalemBlaineKeeneQuincyMolineShakopeeSaint PaulPainesvilleJeffersontownTorontoJeffersonvilleHamiltonWarrenRockfordWilkinsburgSpringfieldIndianapolisHaverhillWinston-SalemCantonAshlandCheektowagaApple ValleyYoungstownErieGrand RapidsMiddletownLexington-FayetteJohnstownBrossardRutlandWeirton HeightsFlintMilwaukeeCincinnatiBurlingtonMasonBay CityNorwoodRochesterBrantfordElizabethtownRaleighDaytonSouth MilwaukeeClevelandSaint MichaelZionBarrieAkronSaint-Jean-sur-RichelieuRivière-des-Prairies–Pointe-aux-TremblesBrocktonJenisonProvidenceDorvalBloomingtonWaukeshaAndersonShawiniganSaint CloudGahannaKitchenerDearbornCoventryDublinSault Ste. MarieHopewellSuperiorMontréalMedinaFort ThomasMadisonSt. CatharinesLansingDetroitShaker HeightsKenmoreSpringfieldYpsilantiRichmondDuluthNorth BayLondonWindsorTaylorLincoln ParkSt. ThomasGreenfieldHempsteadChathamFall RiverSarniaPort HuronWorcesterChesapeakeCharlottesvilleNorth ChicopeeEau ClaireRockvilleHartfordBuffaloHagerstownAltoonaEast HamptonEwingScaggsvilleGreater SudburyGreen BayPeterboroughNew LondonHunt ValleyJersey CityAppletonPittsfieldRochesterWashingtonNew BrunswickWaterburyPatersonAlbanyCornwallElizabethBaltimoreSpringfieldSouth LaurelFort LeeLindenNewburghDoverSouth VinelandState CollegeDanburyNew HavenEdgewoodUticaRose HillTrentonNewarkHolbrookBayonneNew York CityPleasantvilleNew CityWhite PlainsLebanonLancasterCarlisleBridgeportWilmingtonHarrisburgYorkPennsaukenToms RiverChesterBearNorristownBellevilleReadingScrantonElktonSyracuseRouyn-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/m³Chester, 29 May: 12.9 µg/m³Chester, 30 May: 17.7 µg/m³Chester, 31 May: 29.4 µg/m³, 5.1× its usual 5.8Chester, 1 June: 18.3 µg/m³Chester, 2 June: 17.8 µg/m³Chester, 3 June: 16.2 µg/m³Chester, 4 June: 6.8 µg/m³Chester, 5 June: 8.8 µg/m³Chester, 6 June: 54.2 µg/m³, 8.7× its usual 6.2Chester, 7 June: 181.0 µg/m³, 29× its usual 6.3Chester, 8 June: 160.0 µg/m³, 25× its usual 6.3Chester, 9 June: 25.5 µg/m³, 4.0× its usual 6.3Chester, 10 June: 20.1 µg/m³Chester, 11 June: 27.1 µg/m³, 4.3× its usual 6.3Chester, 12 June: 17.2 µg/m³Chester, 13 June: no readingChester, 14 June: no readingChester, 15 June: 9.1 µg/m³NewarkNewark, 28 May: 6.8 µg/m³Newark, 29 May: 11.6 µg/m³Newark, 30 May: 13.5 µg/m³Newark, 31 May: 26.5 µg/m³, 4.1× its usual 6.4Newark, 1 June: 19.8 µg/m³Newark, 2 June: 23.8 µg/m³Newark, 3 June: 21.3 µg/m³Newark, 4 June: 7.0 µg/m³Newark, 5 June: 8.1 µg/m³Newark, 6 June: 37.9 µg/m³, 5.7× its usual 6.6Newark, 7 June: 133.0 µg/m³, 20× its usual 6.6Newark, 8 June: 148.5 µg/m³, 22× its usual 6.7Newark, 9 June: 23.3 µg/m³Newark, 10 June: 19.3 µg/m³Newark, 11 June: 25.5 µg/m³, 3.7× its usual 6.9Newark, 12 June: 15.7 µg/m³Newark, 13 June: 8.4 µg/m³Newark, 14 June: 8.5 µg/m³Newark, 15 June: 8.5 µg/m³AlbanyAlbany, 28 May: 10.1 µg/m³Albany, 29 May: 10.7 µg/m³Albany, 30 May: 6.5 µg/m³Albany, 31 May: 26.6 µg/m³, 4.4× its usual 6.1Albany, 1 June: 14.5 µg/m³Albany, 2 June: 16.3 µg/m³Albany, 3 June: 7.1 µg/m³Albany, 4 June: 4.7 µg/m³Albany, 5 June: 9.5 µg/m³Albany, 6 June: 69.3 µg/m³, 11× its usual 6.2Albany, 7 June: 102.0 µg/m³, 16× its usual 6.2Albany, 8 June: 82.3 µg/m³, 13× its usual 6.2Albany, 9 June: 8.4 µg/m³Albany, 10 June: 6.4 µg/m³Albany, 11 June: 19.4 µg/m³Albany, 12 June: 26.4 µg/m³, 3.9× its usual 6.8Albany, 13 June: 9.4 µg/m³Albany, 14 June: 9.8 µg/m³Albany, 15 June: 8.2 µg/m³BridgeportBridgeport, 28 May: 12.2 µg/m³Bridgeport, 29 May: 15.4 µg/m³Bridgeport, 30 May: 18.9 µg/m³Bridgeport, 31 May: 20.7 µg/m³Bridgeport, 1 June: 25.9 µg/m³, 4.2× its usual 6.1Bridgeport, 2 June: 16.4 µg/m³Bridgeport, 3 June: 11.9 µg/m³Bridgeport, 4 June: 4.3 µg/m³Bridgeport, 5 June: 4.0 µg/m³Bridgeport, 6 June: 81.0 µg/m³, 13× its usual 6.3Bridgeport, 7 June: 165.0 µg/m³, 26× its usual 6.4Bridgeport, 8 June: 96.8 µg/m³, 15× its usual 6.5Bridgeport, 9 June: 13.5 µg/m³Bridgeport, 10 June: 9.5 µg/m³Bridgeport, 11 June: 31.3 µg/m³, 4.5× its usual 6.9Bridgeport, 12 June: 28.9 µg/m³, 4.1× its usual 7.0Bridgeport, 13 June: 8.5 µg/m³Bridgeport, 14 June: 11.6 µg/m³Bridgeport, 15 June: 6.1 µg/m³Rose HillRose Hill, 28 May: 6.1 µg/m³Rose Hill, 29 May: 5.8 µg/m³Rose Hill, 30 May: 19.9 µg/m³Rose Hill, 31 May: 24.6 µg/m³Rose Hill, 1 June: 32.8 µg/m³, 5.1× its usual 6.4Rose Hill, 2 June: 32.3 µg/m³, 5.0× its usual 6.5Rose Hill, 3 June: 16.8 µg/m³Rose Hill, 4 June: 9.1 µg/m³Rose Hill, 5 June: 9.0 µg/m³Rose Hill, 6 June: 35.5 µg/m³, 5.4× its usual 6.6Rose Hill, 7 June: 101.0 µg/m³, 15× its usual 6.6Rose Hill, 8 June: 149.0 µg/m³, 22× its usual 6.8Rose Hill, 9 June: 24.6 µg/m³Rose Hill, 10 June: 20.8 µg/m³Rose Hill, 11 June: 27.4 µg/m³, 4.0× its usual 6.8Rose Hill, 12 June: 14.0 µg/m³Rose Hill, 13 June: 8.6 µg/m³Rose Hill, 14 June: no readingRose Hill, 15 June: 7.1 µg/m³South VinelandSouth Vineland, 28 May: 5.7 µg/m³South Vineland, 29 May: 8.2 µg/m³South Vineland, 30 May: 11.2 µg/m³South Vineland, 31 May: 12.6 µg/m³South Vineland, 1 June: 36.3 µg/m³, 5.8× its usual 6.3South Vineland, 2 June: 10.5 µg/m³South Vineland, 3 June: 9.0 µg/m³South Vineland, 4 June: 4.3 µg/m³South Vineland, 5 June: 5.7 µg/m³South Vineland, 6 June: 23.7 µg/m³South Vineland, 7 June: no readingSouth Vineland, 8 June: 136.0 µg/m³, 21× its usual 6.5South Vineland, 9 June: 26.2 µg/m³, 4.0× its usual 6.5South Vineland, 10 June: 14.1 µg/m³South Vineland, 11 June: 22.2 µg/m³South Vineland, 12 June: 16.2 µg/m³South Vineland, 13 June: 6.0 µg/m³South Vineland, 14 June: 7.5 µg/m³South Vineland, 15 June: 7.3 µg/m³DoverDover, 28 May: 4.4 µg/m³Dover, 29 May: 8.0 µg/m³Dover, 30 May: 16.2 µg/m³Dover, 31 May: 13.4 µg/m³Dover, 1 June: 37.0 µg/m³, 5.9× its usual 6.3Dover, 2 June: 10.3 µg/m³Dover, 3 June: 9.3 µg/m³Dover, 4 June: 5.5 µg/m³Dover, 5 June: 5.9 µg/m³Dover, 6 June: 27.0 µg/m³, 4.2× its usual 6.4Dover, 7 June: 106.0 µg/m³, 17× its usual 6.4Dover, 8 June: 132.0 µg/m³, 20× its usual 6.5Dover, 9 June: 31.0 µg/m³, 4.7× its usual 6.6Dover, 10 June: 17.4 µg/m³Dover, 11 June: 25.5 µg/m³, 3.7× its usual 6.9Dover, 12 June: 15.0 µg/m³Dover, 13 June: 7.8 µg/m³Dover, 14 June: 8.4 µg/m³Dover, 15 June: 7.3 µg/m³SpringfieldSpringfield, 28 May: 5.7 µg/m³Springfield, 29 May: 6.1 µg/m³Springfield, 30 May: 19.4 µg/m³Springfield, 31 May: 22.6 µg/m³Springfield, 1 June: 29.9 µg/m³, 4.4× its usual 6.8Springfield, 2 June: 27.6 µg/m³, 4.0× its usual 6.9Springfield, 3 June: 17.0 µg/m³Springfield, 4 June: 8.9 µg/m³Springfield, 5 June: 8.5 µg/m³Springfield, 6 June: 32.9 µg/m³, 4.7× its usual 7.0Springfield, 7 June: 89.3 µg/m³, 13× its usual 7.0Springfield, 8 June: 128.0 µg/m³, 18× its usual 7.1Springfield, 9 June: 22.9 µg/m³Springfield, 10 June: 19.9 µg/m³Springfield, 11 June: 26.1 µg/m³, 3.6× its usual 7.2Springfield, 12 June: 14.0 µg/m³Springfield, 13 June: 8.3 µg/m³Springfield, 14 June: 8.5 µg/m³Springfield, 15 June: 6.5 µg/m³WashingtonWashington, 28 May: 6.6 µg/m³Washington, 29 May: 6.7 µg/m³Washington, 30 May: 15.5 µg/m³Washington, 31 May: 19.3 µg/m³Washington, 1 June: 28.1 µg/m³, 3.8× its usual 7.4Washington, 2 June: 27.8 µg/m³, 3.8× its usual 7.3Washington, 3 June: 15.5 µg/m³Washington, 4 June: 7.0 µg/m³Washington, 5 June: 7.2 µg/m³Washington, 6 June: 26.0 µg/m³, 3.6× its usual 7.3Washington, 7 June: 71.2 µg/m³, 9.8× its usual 7.3Washington, 8 June: 115.5 µg/m³, 15× its usual 7.5Washington, 9 June: 19.0 µg/m³Washington, 10 June: 16.1 µg/m³Washington, 11 June: 23.0 µg/m³Washington, 12 June: 13.0 µg/m³Washington, 13 June: 7.8 µg/m³Washington, 14 June: 7.5 µg/m³Washington, 15 June: 7.2 µg/m³PleasantvillePleasantville, 28 May: 6.0 µg/m³Pleasantville, 29 May: 7.6 µg/m³Pleasantville, 30 May: 10.9 µg/m³Pleasantville, 31 May: 15.4 µg/m³Pleasantville, 1 June: 7.1 µg/m³Pleasantville, 2 June: 55.5 µg/m³, 9.7× its usual 5.7Pleasantville, 3 June: 9.4 µg/m³Pleasantville, 4 June: 3.5 µg/m³Pleasantville, 5 June: 5.2 µg/m³Pleasantville, 6 June: 26.2 µg/m³, 4.2× its usual 6.2Pleasantville, 7 June: 118.0 µg/m³, 18× its usual 6.4Pleasantville, 8 June: 148.0 µg/m³, 23× its usual 6.5Pleasantville, 9 June: 26.0 µg/m³, 3.9× its usual 6.7Pleasantville, 10 June: 16.3 µg/m³Pleasantville, 11 June: 25.2 µg/m³, 3.5× its usual 7.1Pleasantville, 12 June: 18.4 µg/m³Pleasantville, 13 June: 5.6 µg/m³Pleasantville, 14 June: 9.2 µg/m³Pleasantville, 15 June: 7.0 µg/m³Rouyn-NorandaRouyn-Noranda, 28 May: 7.9 µg/m³Rouyn-Noranda, 29 May: 6.7 µg/m³Rouyn-Noranda, 30 May: 10.6 µg/m³Rouyn-Noranda, 31 May: 13.5 µg/m³Rouyn-Noranda, 1 June: 14.0 µg/m³Rouyn-Noranda, 2 June: 32.2 µg/m³Rouyn-Noranda, 3 June: 183.0 µg/m³, 37× its usual 5.0Rouyn-Noranda, 4 June: 218.0 µg/m³Rouyn-Noranda, 5 June: 48.6 µg/m³, 9.3× its usual 5.2Rouyn-Noranda, 6 June: 12.3 µg/m³Rouyn-Noranda, 7 June: 9.2 µg/m³Rouyn-Noranda, 8 June: 20.4 µg/m³Rouyn-Noranda, 9 June: 67.7 µg/m³, 12× its usual 5.7Rouyn-Noranda, 10 June: 24.1 µg/m³Rouyn-Noranda, 11 June: 6.9 µg/m³Rouyn-Noranda, 12 June: 35.0 µg/m³Rouyn-Noranda, 13 June: 16.9 µg/m³Rouyn-Noranda, 14 June: 9.9 µg/m³Rouyn-Noranda, 15 June: 17.1 µg/m³AppletonAppleton, 28 May: 9.1 µg/m³Appleton, 29 May: 9.4 µg/m³Appleton, 30 May: 11.0 µg/m³Appleton, 31 May: 11.7 µg/m³Appleton, 1 June: 9.8 µg/m³Appleton, 2 June: 14.5 µg/m³Appleton, 3 June: 21.7 µg/m³Appleton, 4 June: 79.8 µg/m³, 15× its usual 5.4Appleton, 5 June: 47.9 µg/m³, 8.7× its usual 5.5Appleton, 6 June: no readingAppleton, 7 June: no readingAppleton, 8 June: 7.6 µg/m³Appleton, 9 June: 12.5 µg/m³Appleton, 10 June: 14.4 µg/m³Appleton, 11 June: 5.5 µg/m³Appleton, 12 June: 7.1 µg/m³Appleton, 13 June: 17.5 µg/m³Appleton, 14 June: 28.8 µg/m³Appleton, 15 June: 16.4 µg/m³KingstonKingston, 28 May: 5.4 µg/m³Kingston, 29 May: 6.7 µg/m³Kingston, 30 May: 11.7 µg/m³Kingston, 31 May: 14.5 µg/m³Kingston, 1 June: 15.6 µg/m³Kingston, 2 June: 16.3 µg/m³Kingston, 3 June: 10.6 µg/m³Kingston, 4 June: 8.2 µg/m³Kingston, 5 June: 30.0 µg/m³, 5.8× its usual 5.2Kingston, 6 June: 114.0 µg/m³, 22× its usual 5.3Kingston, 7 June: 210.0 µg/m³, 40× its usual 5.3Kingston, 8 June: 29.3 µg/m³, 5.5× its usual 5.3Kingston, 9 June: 4.3 µg/m³Kingston, 10 June: 28.7 µg/m³, 5.4× its usual 5.3Kingston, 11 June: 23.8 µg/m³Kingston, 12 June: 20.0 µg/m³Kingston, 13 June: 10.1 µg/m³Kingston, 14 June: 9.9 µg/m³Kingston, 15 June: 9.3 µg/m³OttawaOttawa, 28 May: 7.1 µg/m³Ottawa, 29 May: 7.4 µg/m³Ottawa, 30 May: 9.1 µg/m³Ottawa, 31 May: 12.8 µg/m³Ottawa, 1 June: 14.3 µg/m³Ottawa, 2 June: 16.5 µg/m³Ottawa, 3 June: 9.4 µg/m³Ottawa, 4 June: 8.4 µg/m³Ottawa, 5 June: 49.0 µg/m³, 9.1× its usual 5.4Ottawa, 6 June: 138.5 µg/m³, 26× its usual 5.4Ottawa, 7 June: 208.0 µg/m³, 39× its usual 5.4Ottawa, 8 June: 3.3 µg/m³Ottawa, 9 June: 3.7 µg/m³Ottawa, 10 June: 5.8 µg/m³Ottawa, 11 June: 18.8 µg/m³Ottawa, 12 June: 20.8 µg/m³Ottawa, 13 June: 11.1 µg/m³Ottawa, 14 June: 12.8 µg/m³Ottawa, 15 June: 24.9 µg/m³BellevilleBelleville, 28 May: 7.4 µg/m³Belleville, 29 May: 8.6 µg/m³Belleville, 30 May: 8.7 µg/m³Belleville, 31 May: 15.3 µg/m³Belleville, 1 June: 17.3 µg/m³Belleville, 2 June: 18.0 µg/m³Belleville, 3 June: 12.4 µg/m³Belleville, 4 June: 14.3 µg/m³Belleville, 5 June: 50.2 µg/m³, 9.8× its usual 5.1Belleville, 6 June: 109.0 µg/m³, 21× its usual 5.3Belleville, 7 June: 155.0 µg/m³, 30× its usual 5.2Belleville, 8 June: 29.6 µg/m³, 5.8× its usual 5.1Belleville, 9 June: 9.6 µg/m³Belleville, 10 June: 26.3 µg/m³, 5.0× its usual 5.3Belleville, 11 June: 29.5 µg/m³, 5.5× its usual 5.4Belleville, 12 June: 21.6 µg/m³Belleville, 13 June: 11.5 µg/m³Belleville, 14 June: 11.0 µg/m³Belleville, 15 June: 9.8 µg/m³BuffaloBuffalo, 28 May: 9.9 µg/m³Buffalo, 29 May: 16.7 µg/m³Buffalo, 30 May: 13.8 µg/m³Buffalo, 31 May: 15.8 µg/m³Buffalo, 1 June: 16.4 µg/m³Buffalo, 2 June: 18.4 µg/m³Buffalo, 3 June: 14.3 µg/m³Buffalo, 4 June: 21.8 µg/m³Buffalo, 5 June: 39.9 µg/m³, 5.6× its usual 7.1Buffalo, 6 June: 52.8 µg/m³, 7.3× its usual 7.2Buffalo, 7 June: 91.7 µg/m³, 13× its usual 7.3Buffalo, 8 June: 39.8 µg/m³, 5.4× its usual 7.4Buffalo, 9 June: 28.5 µg/m³, 3.8× its usual 7.5Buffalo, 10 June: 27.4 µg/m³, 3.7× its usual 7.5Buffalo, 11 June: 29.8 µg/m³, 3.9× its usual 7.6Buffalo, 12 June: 16.1 µg/m³Buffalo, 13 June: 9.7 µg/m³Buffalo, 14 June: 8.8 µg/m³Buffalo, 15 June: 13.1 µg/m³RochesterRochester, 28 May: 10.1 µg/m³Rochester, 29 May: 9.6 µg/m³Rochester, 30 May: 10.7 µg/m³Rochester, 31 May: 13.6 µg/m³Rochester, 1 June: 14.4 µg/m³Rochester, 2 June: 12.7 µg/m³Rochester, 3 June: 9.4 µg/m³Rochester, 4 June: 10.3 µg/m³Rochester, 5 June: 32.5 µg/m³, 5.8× its usual 5.6Rochester, 6 June: 53.7 µg/m³, 9.6× its usual 5.6Rochester, 7 June: 88.0 µg/m³, 15× its usual 5.7Rochester, 8 June: 16.9 µg/m³Rochester, 9 June: 21.5 µg/m³Rochester, 10 June: 22.3 µg/m³Rochester, 11 June: 25.2 µg/m³, 4.1× its usual 6.1Rochester, 12 June: 18.0 µg/m³Rochester, 13 June: 7.9 µg/m³Rochester, 14 June: 4.7 µg/m³Rochester, 15 June: 7.8 µg/m³BethlehemBethlehem, 28 May: 7.1 µg/m³Bethlehem, 29 May: 11.7 µg/m³Bethlehem, 30 May: 9.1 µg/m³Bethlehem, 31 May: 17.8 µg/m³Bethlehem, 1 June: 19.6 µg/m³Bethlehem, 2 June: 15.1 µg/m³Bethlehem, 3 June: 13.2 µg/m³Bethlehem, 4 June: 7.2 µg/m³Bethlehem, 5 June: 11.4 µg/m³Bethlehem, 6 June: 77.2 µg/m³, 13× its usual 6.1Bethlehem, 7 June: 253.0 µg/m³, 41× its usual 6.1Bethlehem, 8 June: 135.0 µg/m³, 22× its usual 6.2Bethlehem, 9 June: 15.2 µg/m³Bethlehem, 10 June: 19.1 µg/m³Bethlehem, 11 June: 24.4 µg/m³Bethlehem, 12 June: 19.3 µg/m³Bethlehem, 13 June: 8.0 µg/m³Bethlehem, 14 June: 9.0 µg/m³Bethlehem, 15 June: 8.6 µg/m³AllentownAllentown, 28 May: 6.6 µg/m³Allentown, 29 May: 12.1 µg/m³Allentown, 30 May: 8.6 µg/m³Allentown, 31 May: 18.0 µg/m³Allentown, 1 June: 19.3 µg/m³Allentown, 2 June: 17.2 µg/m³Allentown, 3 June: 13.2 µg/m³Allentown, 4 June: 7.1 µg/m³Allentown, 5 June: 10.9 µg/m³Allentown, 6 June: 77.6 µg/m³, 13× its usual 6.2Allentown, 7 June: 239.0 µg/m³, 37× its usual 6.4Allentown, 8 June: 125.0 µg/m³, 19× its usual 6.5Allentown, 9 June: 16.4 µg/m³Allentown, 10 June: 19.1 µg/m³Allentown, 11 June: 24.5 µg/m³Allentown, 12 June: 19.2 µg/m³Allentown, 13 June: 7.6 µg/m³Allentown, 14 June: 8.3 µg/m³Allentown, 15 June: 8.4 µg/m³ScrantonScranton, 28 May: 8.6 µg/m³Scranton, 29 May: 11.2 µg/m³Scranton, 30 May: 10.6 µg/m³Scranton, 31 May: 11.8 µg/m³Scranton, 1 June: 12.0 µg/m³Scranton, 2 June: 16.0 µg/m³Scranton, 3 June: 14.3 µg/m³Scranton, 4 June: 8.0 µg/m³Scranton, 5 June: 17.0 µg/m³Scranton, 6 June: 98.3 µg/m³, 14× its usual 6.9Scranton, 7 June: 215.0 µg/m³, 31× its usual 6.9Scranton, 8 June: 96.8 µg/m³, 14× its usual 7.0Scranton, 9 June: 14.9 µg/m³Scranton, 10 June: 20.2 µg/m³Scranton, 11 June: no readingScranton, 12 June: no readingScranton, 13 June: 9.3 µg/m³Scranton, 14 June: 10.2 µg/m³Scranton, 15 June: 10.4 µg/m³ReadingReading, 28 May: 6.8 µg/m³Reading, 29 May: 11.1 µg/m³Reading, 30 May: 8.7 µg/m³Reading, 31 May: 16.5 µg/m³Reading, 1 June: 14.7 µg/m³Reading, 2 June: 16.6 µg/m³Reading, 3 June: 13.7 µg/m³Reading, 4 June: 8.5 µg/m³Reading, 5 June: 11.6 µg/m³Reading, 6 June: 62.5 µg/m³, 9.5× its usual 6.6Reading, 7 June: 204.0 µg/m³, 31× its usual 6.6Reading, 8 June: 168.0 µg/m³, 25× its usual 6.6Reading, 9 June: 17.4 µg/m³Reading, 10 June: 19.7 µg/m³Reading, 11 June: 24.3 µg/m³Reading, 12 June: 16.1 µg/m³Reading, 13 June: 9.1 µg/m³Reading, 14 June: 8.8 µg/m³Reading, 15 June: 8.0 µg/m³PennsaukenPennsauken, 28 May: 6.7 µg/m³Pennsauken, 29 May: 12.7 µg/m³Pennsauken, 30 May: 16.4 µg/m³Pennsauken, 31 May: 20.7 µg/m³Pennsauken, 1 June: 21.0 µg/m³Pennsauken, 2 June: 23.5 µg/m³Pennsauken, 3 June: 14.7 µg/m³Pennsauken, 4 June: 6.4 µg/m³Pennsauken, 5 June: 9.4 µg/m³Pennsauken, 6 June: 58.3 µg/m³, 7.7× its usual 7.6Pennsauken, 7 June: 204.0 µg/m³, 27× its usual 7.6Pennsauken, 8 June: 145.0 µg/m³, 19× its usual 7.7Pennsauken, 9 June: 23.2 µg/m³Pennsauken, 10 June: 22.0 µg/m³Pennsauken, 11 June: 27.7 µg/m³, 3.5× its usual 7.9Pennsauken, 12 June: 19.8 µg/m³Pennsauken, 13 June: 8.8 µg/m³Pennsauken, 14 June: 9.8 µg/m³Pennsauken, 15 June: 9.2 µg/m³NorristownNorristown, 28 May: 7.0 µg/m³Norristown, 29 May: 11.0 µg/m³Norristown, 30 May: 13.1 µg/m³Norristown, 31 May: 20.0 µg/m³Norristown, 1 June: 19.1 µg/m³Norristown, 2 June: 22.3 µg/m³Norristown, 3 June: 14.2 µg/m³Norristown, 4 June: 6.6 µg/m³Norristown, 5 June: 8.7 µg/m³Norristown, 6 June: 54.4 µg/m³, 8.1× its usual 6.7Norristown, 7 June: 202.0 µg/m³, 30× its usual 6.8Norristown, 8 June: 165.0 µg/m³, 24× its usual 6.8Norristown, 9 June: 21.9 µg/m³Norristown, 10 June: 20.1 µg/m³Norristown, 11 June: 25.4 µg/m³, 3.7× its usual 6.9Norristown, 12 June: 18.0 µg/m³Norristown, 13 June: 8.6 µg/m³Norristown, 14 June: 8.7 µg/m³Norristown, 15 June: 8.5 µg/m³HarrisburgHarrisburg, 28 May: 8.2 µg/m³Harrisburg, 29 May: 12.8 µg/m³Harrisburg, 30 May: 10.9 µg/m³Harrisburg, 31 May: 15.5 µg/m³Harrisburg, 1 June: 17.8 µg/m³Harrisburg, 2 June: 17.6 µg/m³Harrisburg, 3 June: 16.4 µg/m³Harrisburg, 4 June: 10.0 µg/m³Harrisburg, 5 June: 12.3 µg/m³Harrisburg, 6 June: 51.2 µg/m³, 6.9× its usual 7.4Harrisburg, 7 June: 148.0 µg/m³, 20× its usual 7.4Harrisburg, 8 June: 195.0 µg/m³, 26× its usual 7.5Harrisburg, 9 June: 24.8 µg/m³Harrisburg, 10 June: 23.1 µg/m³Harrisburg, 11 June: 28.6 µg/m³, 3.8× its usual 7.5Harrisburg, 12 June: 19.0 µg/m³Harrisburg, 13 June: 10.9 µg/m³Harrisburg, 14 June: 7.8 µg/m³Harrisburg, 15 June: 9.1 µg/m³YorkYork, 28 May: 6.0 µg/m³York, 29 May: 14.7 µg/m³York, 30 May: 10.9 µg/m³York, 31 May: 18.4 µg/m³York, 1 June: 20.5 µg/m³York, 2 June: 19.2 µg/m³York, 3 June: 17.7 µg/m³York, 4 June: 9.9 µg/m³York, 5 June: 11.4 µg/m³York, 6 June: 43.6 µg/m³, 6.1× its usual 7.1York, 7 June: 117.0 µg/m³, 16× its usual 7.1York, 8 June: 193.0 µg/m³, 27× its usual 7.2York, 9 June: 25.8 µg/m³, 3.6× its usual 7.2York, 10 June: 21.3 µg/m³York, 11 June: 25.3 µg/m³, 3.5× its usual 7.2York, 12 June: 16.7 µg/m³York, 13 June: 10.4 µg/m³York, 14 June: 8.6 µg/m³York, 15 June: 9.7 µg/m³ElktonElkton, 28 May: 6.2 µg/m³Elkton, 29 May: 10.0 µg/m³Elkton, 30 May: 15.8 µg/m³Elkton, 31 May: 22.8 µg/m³Elkton, 1 June: 18.9 µg/m³Elkton, 2 June: 18.5 µg/m³Elkton, 3 June: 11.6 µg/m³Elkton, 4 June: 6.7 µg/m³Elkton, 5 June: 7.6 µg/m³Elkton, 6 June: 34.7 µg/m³, 6.1× its usual 5.7Elkton, 7 June: 132.0 µg/m³, 23× its usual 5.7Elkton, 8 June: 185.0 µg/m³, 32× its usual 5.7Elkton, 9 June: 26.6 µg/m³, 4.7× its usual 5.7Elkton, 10 June: 20.3 µg/m³Elkton, 11 June: 26.4 µg/m³, 4.5× its usual 5.9Elkton, 12 June: 16.1 µg/m³Elkton, 13 June: 8.9 µg/m³Elkton, 14 June: 8.3 µg/m³Elkton, 15 June: 8.1 µg/m³SyracuseSyracuse, 28 May: 6.9 µg/m³Syracuse, 29 May: 8.3 µg/m³Syracuse, 30 May: 10.9 µg/m³Syracuse, 31 May: 10.6 µg/m³Syracuse, 1 June: 14.9 µg/m³Syracuse, 2 June: 15.5 µg/m³Syracuse, 3 June: 12.4 µg/m³Syracuse, 4 June: 8.5 µg/m³Syracuse, 5 June: 24.7 µg/m³Syracuse, 6 June: 89.5 µg/m³, 17× its usual 5.2Syracuse, 7 June: 181.0 µg/m³, 35× its usual 5.2Syracuse, 8 June: 40.4 µg/m³, 7.8× its usual 5.2Syracuse, 9 June: 11.6 µg/m³Syracuse, 10 June: 18.5 µg/m³Syracuse, 11 June: 20.1 µg/m³Syracuse, 12 June: 21.2 µg/m³Syracuse, 13 June: 9.3 µg/m³Syracuse, 14 June: 7.7 µg/m³Syracuse, 15 June: 8.3 µg/m³LebanonLebanon, 28 May: 7.2 µg/m³Lebanon, 29 May: 11.5 µg/m³Lebanon, 30 May: 9.5 µg/m³Lebanon, 31 May: 15.6 µg/m³Lebanon, 1 June: 16.1 µg/m³Lebanon, 2 June: 18.3 µg/m³Lebanon, 3 June: 16.9 µg/m³Lebanon, 4 June: 9.8 µg/m³Lebanon, 5 June: 12.4 µg/m³Lebanon, 6 June: 55.1 µg/m³, 7.5× its usual 7.3Lebanon, 7 June: 181.0 µg/m³, 25× its usual 7.3Lebanon, 8 June: 171.0 µg/m³, 23× its usual 7.4Lebanon, 9 June: 19.9 µg/m³Lebanon, 10 June: 20.5 µg/m³Lebanon, 11 June: 26.0 µg/m³, 3.5× its usual 7.4Lebanon, 12 June: 16.5 µg/m³Lebanon, 13 June: 9.5 µg/m³Lebanon, 14 June: 8.8 µg/m³Lebanon, 15 June: 8.3 µg/m³BearBear, 28 May: 5.1 µg/m³Bear, 29 May: 9.4 µg/m³Bear, 30 May: 16.6 µg/m³Bear, 31 May: 18.9 µg/m³Bear, 1 June: 13.1 µg/m³Bear, 2 June: 12.5 µg/m³Bear, 3 June: 11.7 µg/m³Bear, 4 June: 6.6 µg/m³Bear, 5 June: 8.0 µg/m³Bear, 6 June: 39.9 µg/m³, 6.6× its usual 6.0Bear, 7 June: 154.0 µg/m³, 26× its usual 6.0Bear, 8 June: 181.0 µg/m³, 30× its usual 6.1Bear, 9 June: 26.1 µg/m³, 4.1× its usual 6.3Bear, 10 June: 20.1 µg/m³Bear, 11 June: 27.1 µg/m³, 4.3× its usual 6.3Bear, 12 June: 17.2 µg/m³Bear, 13 June: 9.2 µg/m³Bear, 14 June: 9.1 µg/m³Bear, 15 June: 8.0 µg/m³LancasterLancaster, 28 May: 8.1 µg/m³Lancaster, 29 May: 16.0 µg/m³Lancaster, 30 May: 10.4 µg/m³Lancaster, 31 May: 17.9 µg/m³Lancaster, 1 June: 22.5 µg/m³Lancaster, 2 June: 22.5 µg/m³Lancaster, 3 June: 16.1 µg/m³Lancaster, 4 June: 8.8 µg/m³Lancaster, 5 June: no readingLancaster, 6 June: 51.2 µg/m³, 7.5× its usual 6.8Lancaster, 7 June: 142.0 µg/m³, 21× its usual 6.8Lancaster, 8 June: 172.0 µg/m³, 25× its usual 6.8Lancaster, 9 June: 23.5 µg/m³Lancaster, 10 June: 21.9 µg/m³Lancaster, 11 June: 27.3 µg/m³, 4.0× its usual 6.8Lancaster, 12 June: 16.6 µg/m³Lancaster, 13 June: 10.8 µg/m³Lancaster, 14 June: 10.1 µg/m³Lancaster, 15 June: 10.1 µg/m³New York CityNew York City, 28 May: 6.1 µg/m³New York City, 29 May: 10.8 µg/m³New York City, 30 May: 12.6 µg/m³New York City, 31 May: 11.7 µg/m³New York City, 1 June: 15.7 µg/m³New York City, 2 June: 15.5 µg/m³New York City, 3 June: 12.3 µg/m³New York City, 4 June: 4.7 µg/m³New York City, 5 June: 10.0 µg/m³New York City, 6 June: 79.9 µg/m³, 11× its usual 7.3New York City, 7 June: 170.0 µg/m³, 23× its usual 7.5New York City, 8 June: 92.6 µg/m³, 12× its usual 7.5New York City, 9 June: 13.4 µg/m³New York City, 10 June: 13.4 µg/m³New York City, 11 June: 30.6 µg/m³, 3.8× its usual 8.0New York City, 12 June: 24.4 µg/m³New York City, 13 June: 7.8 µg/m³New York City, 14 June: 9.5 µg/m³New York City, 15 June: 7.9 µg/m³WilmingtonWilmington, 28 May: 5.8 µg/m³Wilmington, 29 May: 11.6 µg/m³Wilmington, 30 May: 15.7 µg/m³Wilmington, 31 May: 23.1 µg/m³Wilmington, 1 June: 15.8 µg/m³Wilmington, 2 June: 18.3 µg/m³Wilmington, 3 June: 19.3 µg/m³Wilmington, 4 June: 7.2 µg/m³Wilmington, 5 June: 8.8 µg/m³Wilmington, 6 June: 45.2 µg/m³, 6.8× its usual 6.6Wilmington, 7 June: 170.0 µg/m³, 26× its usual 6.6Wilmington, 8 June: 169.5 µg/m³, 25× its usual 6.7Wilmington, 9 June: 26.2 µg/m³, 3.9× its usual 6.7Wilmington, 10 June: 22.1 µg/m³Wilmington, 11 June: 30.0 µg/m³, 4.5× its usual 6.7Wilmington, 12 June: 19.3 µg/m³Wilmington, 13 June: 9.8 µg/m³Wilmington, 14 June: 9.5 µg/m³Wilmington, 15 June: 9.5 µg/m³CarlisleCarlisle, 28 May: 7.2 µg/m³Carlisle, 29 May: 10.7 µg/m³Carlisle, 30 May: 11.1 µg/m³Carlisle, 31 May: 15.1 µg/m³Carlisle, 1 June: 14.8 µg/m³Carlisle, 2 June: 15.5 µg/m³Carlisle, 3 June: 15.3 µg/m³Carlisle, 4 June: 11.5 µg/m³Carlisle, 5 June: 11.2 µg/m³Carlisle, 6 June: 43.8 µg/m³, 7.0× its usual 6.3Carlisle, 7 June: 123.0 µg/m³, 20× its usual 6.3Carlisle, 8 June: 160.0 µg/m³, 25× its usual 6.3Carlisle, 9 June: 24.4 µg/m³Carlisle, 10 June: 22.2 µg/m³Carlisle, 11 June: 26.1 µg/m³, 4.1× its usual 6.3Carlisle, 12 June: 17.0 µg/m³Carlisle, 13 June: 9.9 µg/m³Carlisle, 14 June: 6.8 µg/m³Carlisle, 15 June: 8.2 µg/m³LindenLinden, 28 May: 10.0 µg/m³Linden, 29 May: 10.0 µg/m³Linden, 30 May: 12.1 µg/m³Linden, 31 May: 10.7 µg/m³Linden, 1 June: 14.0 µg/m³Linden, 2 June: 16.7 µg/m³Linden, 3 June: 10.7 µg/m³Linden, 4 June: 4.4 µg/m³Linden, 5 June: 10.3 µg/m³Linden, 6 June: 41.7 µg/m³, 6.0× its usual 7.0Linden, 7 June: 147.0 µg/m³, 20× its usual 7.3Linden, 8 June: 83.5 µg/m³, 11× its usual 7.5Linden, 9 June: 10.2 µg/m³Linden, 10 June: 13.0 µg/m³Linden, 11 June: 24.7 µg/m³Linden, 12 June: 21.0 µg/m³Linden, 13 June: 6.3 µg/m³Linden, 14 June: 12.0 µg/m³Linden, 15 June: 6.5 µg/m³DanburyDanbury, 28 May: 7.6 µg/m³Danbury, 29 May: 9.1 µg/m³Danbury, 30 May: 17.9 µg/m³Danbury, 31 May: 10.0 µg/m³Danbury, 1 June: 16.1 µg/m³Danbury, 2 June: 12.7 µg/m³Danbury, 3 June: 9.0 µg/m³Danbury, 4 June: 3.9 µg/m³Danbury, 5 June: 7.1 µg/m³Danbury, 6 June: 69.9 µg/m³, 12× its usual 6.0Danbury, 7 June: 130.0 µg/m³, 21× its usual 6.1Danbury, 8 June: 68.1 µg/m³, 11× its usual 6.4Danbury, 9 June: 9.8 µg/m³Danbury, 10 June: 9.4 µg/m³Danbury, 11 June: 24.1 µg/m³Danbury, 12 June: 22.0 µg/m³Danbury, 13 June: 5.8 µg/m³Danbury, 14 June: 8.1 µg/m³Danbury, 15 June: 5.6 µg/m³New HavenNew Haven, 28 May: 7.0 µg/m³New Haven, 29 May: 8.8 µg/m³New Haven, 30 May: 12.1 µg/m³New Haven, 31 May: 10.1 µg/m³New Haven, 1 June: 16.8 µg/m³New Haven, 2 June: 11.9 µg/m³New Haven, 3 June: 9.7 µg/m³New Haven, 4 June: 3.4 µg/m³New Haven, 5 June: 3.2 µg/m³New Haven, 6 June: 64.0 µg/m³, 11× its usual 5.9New Haven, 7 June: 127.0 µg/m³, 22× its usual 5.9New Haven, 8 June: 83.2 µg/m³, 13× its usual 6.2New Haven, 9 June: 20.2 µg/m³New Haven, 10 June: 7.8 µg/m³New Haven, 11 June: 24.0 µg/m³New Haven, 12 June: 25.0 µg/m³, 3.7× its usual 6.7New Haven, 13 June: 7.4 µg/m³New Haven, 14 June: 9.8 µg/m³New Haven, 15 June: 5.5 µg/m³State CollegeState College, 28 May: 8.7 µg/m³State College, 29 May: 10.1 µg/m³State College, 30 May: 13.8 µg/m³State College, 31 May: 11.6 µg/m³State College, 1 June: 13.2 µg/m³State College, 2 June: 14.6 µg/m³State College, 3 June: 18.2 µg/m³State College, 4 June: 12.5 µg/m³State College, 5 June: 14.1 µg/m³State College, 6 June: 46.1 µg/m³, 7.8× its usual 5.9State College, 7 June: 124.0 µg/m³, 21× its usual 5.9State College, 8 June: 80.1 µg/m³, 14× its usual 5.9State College, 9 June: 28.7 µg/m³, 4.8× its usual 6.0State College, 10 June: 26.1 µg/m³, 4.4× its usual 6.0State College, 11 June: 25.1 µg/m³, 4.2× its usual 6.0State College, 12 June: 13.8 µg/m³State College, 13 June: 10.3 µg/m³State College, 14 June: 5.7 µg/m³State College, 15 June: 8.9 µg/m³PatersonPaterson, 28 May: 10.5 µg/m³Paterson, 29 May: 10.1 µg/m³Paterson, 30 May: 10.0 µg/m³Paterson, 31 May: 11.3 µg/m³Paterson, 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× its usual 7.5Paterson, 7 June: 122.0 µg/m³, 16× its usual 7.5Paterson, 8 June: 70.8 µg/m³, 9.3× its usual 7.6Paterson, 9 June: 7.4 µg/m³Paterson, 10 June: 11.4 µg/m³Paterson, 11 June: no readingPaterson, 12 June: no readingPaterson, 13 June: 6.3 µg/m³Paterson, 14 June: 10.5 µg/m³Paterson, 15 June: 7.1 µg/m³White PlainsWhite Plains, 28 May: 4.7 µg/m³White Plains, 29 May: 7.1 µg/m³White Plains, 30 May: 10.0 µg/m³White Plains, 31 May: 6.5 µg/m³White Plains, 1 June: 11.8 µg/m³White Plains, 2 June: 11.7 µg/m³White Plains, 3 June: 7.9 µg/m³White Plains, 4 June: 1.0 µg/m³White Plains, 5 June: 4.3 µg/m³White Plains, 6 June: 50.2 µg/m³, 10× its usual 3.8White Plains, 7 June: 120.0 µg/m³, 24× its usual 3.9White Plains, 8 June: 62.9 µg/m³, 13× its usual 3.9White Plains, 9 June: 7.7 µg/m³White Plains, 10 June: 8.6 µg/m³White Plains, 11 June: 20.2 µg/m³White Plains, 12 June: 16.5 µg/m³White Plains, 13 June: 3.0 µg/m³White Plains, 14 June: 6.1 µg/m³White Plains, 15 June: 3.6 µg/m³New CityNew City, 28 May: 6.6 µg/m³New City, 29 May: 7.4 µg/m³New City, 30 May: 9.4 µg/m³New City, 31 May: 11.0 µg/m³New City, 1 June: 10.7 µg/m³New City, 2 June: 11.6 µg/m³New City, 3 June: 6.8 µg/m³New City, 4 June: 1.1 µg/m³New City, 5 June: 14.1 µg/m³New City, 6 June: 72.2 µg/m³, 14× its usual 3.9New City, 7 June: 119.0 µg/m³, 24× its usual 3.9New City, 8 June: 56.6 µg/m³, 11× its usual 3.9New City, 9 June: 3.2 µg/m³New City, 10 June: 7.2 µg/m³New City, 11 June: 19.1 µg/m³New City, 12 June: 17.7 µg/m³New City, 13 June: 3.2 µg/m³New City, 14 June: 5.9 µg/m³New City, 15 June: 4.3 µg/m³Fort LeeFort Lee, 28 May: 4.9 µg/m³Fort Lee, 29 May: 7.7 µg/m³Fort Lee, 30 May: 10.1 µg/m³Fort Lee, 31 May: 9.0 µg/m³Fort Lee, 1 June: 13.4 µg/m³Fort Lee, 2 June: 16.8 µg/m³Fort Lee, 3 June: 9.1 µg/m³Fort Lee, 4 June: 2.4 µg/m³Fort Lee, 5 June: 7.8 µg/m³Fort Lee, 6 June: 58.7 µg/m³, 9.6× its usual 6.1Fort Lee, 7 June: 119.0 µg/m³, 19× its usual 6.2Fort Lee, 8 June: 68.8 µg/m³, 10× its usual 6.7Fort Lee, 9 June: 4.5 µg/m³Fort Lee, 10 June: 9.3 µg/m³Fort Lee, 11 June: 23.4 µg/m³Fort Lee, 12 June: 19.1 µg/m³Fort Lee, 13 June: 4.5 µg/m³Fort Lee, 14 June: 7.3 µg/m³Fort Lee, 15 June: 5.2 µg/m³BaltimoreBaltimore, 28 May: 5.9 µg/m³Baltimore, 29 May: 8.6 µg/m³Baltimore, 30 May: no readingBaltimore, 31 May: no readingBaltimore, 1 June: no readingBaltimore, 2 June: no readingBaltimore, 3 June: 13.9 µg/m³Baltimore, 4 June: 6.9 µg/m³Baltimore, 5 June: 6.9 µg/m³Baltimore, 6 June: 27.9 µg/m³, 4.1× its usual 6.8Baltimore, 7 June: 82.3 µg/m³, 12× its usual 6.7Baltimore, 8 June: 117.0 µg/m³, 17× its usual 6.7Baltimore, 9 June: 20.4 µg/m³Baltimore, 10 June: 15.9 µg/m³Baltimore, 11 June: 23.2 µg/m³Baltimore, 12 June: 13.8 µg/m³Baltimore, 13 June: 7.8 µg/m³Baltimore, 14 June: 8.0 µg/m³Baltimore, 15 June: 8.2 µg/m³HolbrookHolbrook, 28 May: 4.3 µg/m³Holbrook, 29 May: 6.6 µg/m³Holbrook, 30 May: 8.6 µg/m³Holbrook, 31 May: 10.3 µg/m³Holbrook, 1 June: 6.8 µg/m³Holbrook, 2 June: 6.2 µg/m³Holbrook, 3 June: 7.0 µg/m³Holbrook, 4 June: 1.3 µg/m³Holbrook, 5 June: 2.4 µg/m³Holbrook, 6 June: 41.8 µg/m³, 8.2× its usual 5.1Holbrook, 7 June: 115.0 µg/m³, 23× its usual 5.1Holbrook, 8 June: 65.7 µg/m³, 13× its usual 5.2Holbrook, 9 June: 14.4 µg/m³Holbrook, 10 June: 15.5 µg/m³Holbrook, 11 June: 17.9 µg/m³Holbrook, 12 June: 15.7 µg/m³Holbrook, 13 June: 8.7 µg/m³Holbrook, 14 June: 4.1 µg/m³Holbrook, 15 June: 2.3 µg/m³BayonneBayonne, 28 May: 2.9 µg/m³Bayonne, 29 May: 7.2 µg/m³Bayonne, 30 May: 8.6 µg/m³Bayonne, 31 May: 7.6 µg/m³Bayonne, 1 June: 9.8 µg/m³Bayonne, 2 June: 10.1 µg/m³Bayonne, 3 June: 6.7 µg/m³Bayonne, 4 June: 1.4 µg/m³Bayonne, 5 June: 12.3 µg/m³Bayonne, 6 June: 55.3 µg/m³, 11× its usual 3.8Bayonne, 7 June: 113.0 µg/m³, 23× its usual 3.9Bayonne, 8 June: 61.7 µg/m³, 12× its usual 3.9Bayonne, 9 June: 4.9 µg/m³Bayonne, 10 June: 8.0 µg/m³Bayonne, 11 June: 17.6 µg/m³Bayonne, 12 June: 14.2 µg/m³Bayonne, 13 June: 4.1 µg/m³Bayonne, 14 June: 4.4 µg/m³Bayonne, 15 June: 3.3 µg/m³EwingEwing, 28 May: 8.4 µg/m³Ewing, 29 May: 11.1 µg/m³Ewing, 30 May: no readingEwing, 31 May: 14.1 µg/m³Ewing, 1 June: 14.0 µg/m³Ewing, 2 June: 17.1 µg/m³Ewing, 3 June: 17.0 µg/m³Ewing, 4 June: 5.4 µg/m³Ewing, 5 June: 10.1 µg/m³Ewing, 6 June: 30.0 µg/m³, 3.6× its usual 8.4Ewing, 7 June: no readingEwing, 8 June: 113.0 µg/m³, 13× its usual 8.5Ewing, 9 June: 19.5 µg/m³Ewing, 10 June: 15.8 µg/m³Ewing, 11 June: 24.8 µg/m³Ewing, 12 June: 17.2 µg/m³Ewing, 13 June: 10.1 µg/m³Ewing, 14 June: 10.6 µg/m³Ewing, 15 June: 8.9 µg/m³Jersey CityJersey City, 28 May: 6.3 µg/m³Jersey City, 29 May: 9.1 µg/m³Jersey City, 30 May: 10.0 µg/m³Jersey City, 31 May: 9.8 µg/m³Jersey City, 1 June: 14.0 µg/m³Jersey City, 2 June: 16.1 µg/m³Jersey City, 3 June: 10.3 µg/m³Jersey City, 4 June: 3.9 µg/m³Jersey City, 5 June: 8.7 µg/m³Jersey City, 6 June: 51.3 µg/m³, 6.9× its usual 7.4Jersey City, 7 June: 110.5 µg/m³, 15× its usual 7.5Jersey City, 8 June: 66.3 µg/m³, 8.7× its usual 7.6Jersey City, 9 June: 8.2 µg/m³Jersey City, 10 June: 9.8 µg/m³Jersey City, 11 June: 23.0 µg/m³Jersey City, 12 June: 19.0 µg/m³Jersey City, 13 June: 5.9 µg/m³Jersey City, 14 June: 7.9 µg/m³Jersey City, 15 June: 6.5 µg/m³UticaUtica, 28 May: 6.5 µg/m³Utica, 29 May: 8.3 µg/m³Utica, 30 May: 6.9 µg/m³Utica, 31 May: 8.8 µg/m³Utica, 1 June: 11.4 µg/m³Utica, 2 June: 13.5 µg/m³Utica, 3 June: 9.4 µg/m³Utica, 4 June: 3.1 µg/m³Utica, 5 June: 23.2 µg/m³Utica, 6 June: 67.6 µg/m³, 14× its usual 4.4Utica, 7 June: 109.0 µg/m³, 22× its usual 4.6Utica, 8 June: 43.9 µg/m³, 8.8× its usual 4.5Utica, 9 June: 4.1 µg/m³Utica, 10 June: 11.0 µg/m³Utica, 11 June: 14.7 µg/m³Utica, 12 June: 17.4 µg/m³Utica, 13 June: 4.5 µg/m³Utica, 14 June: 3.7 µg/m³Utica, 15 June: 6.5 µg/m³ScaggsvilleScaggsville, 28 May: 5.2 µg/m³Scaggsville, 29 May: 6.7 µg/m³Scaggsville, 30 May: 16.0 µg/m³Scaggsville, 31 May: 15.4 µg/m³Scaggsville, 1 June: 22.2 µg/m³Scaggsville, 2 June: 21.3 µg/m³Scaggsville, 3 June: 14.2 µg/m³Scaggsville, 4 June: 6.0 µg/m³Scaggsville, 5 June: 5.1 µg/m³Scaggsville, 6 June: 25.0 µg/m³, 3.2× its usual 7.8Scaggsville, 7 June: 66.2 µg/m³, 8.3× its usual 8.0Scaggsville, 8 June: 109.0 µg/m³, 13× its usual 8.1Scaggsville, 9 June: 20.4 µg/m³Scaggsville, 10 June: 14.3 µg/m³Scaggsville, 11 June: 20.0 µg/m³Scaggsville, 12 June: 13.3 µg/m³Scaggsville, 13 June: 7.6 µg/m³Scaggsville, 14 June: 8.8 µg/m³Scaggsville, 15 June: 6.1 µg/m³NewburghNewburgh, 28 May: 6.7 µg/m³Newburgh, 29 May: 7.6 µg/m³Newburgh, 30 May: 10.5 µg/m³Newburgh, 31 May: 12.7 µg/m³Newburgh, 1 June: 12.2 µg/m³Newburgh, 2 June: 12.3 µg/m³Newburgh, 3 June: 6.5 µg/m³Newburgh, 4 June: 1.3 µg/m³Newburgh, 5 June: 10.0 µg/m³Newburgh, 6 June: 59.5 µg/m³, 12× its usual 4.1Newburgh, 7 June: 101.0 µg/m³, 20× its usual 4.0Newburgh, 8 June: 56.9 µg/m³, 11× its usual 4.3Newburgh, 9 June: 2.9 µg/m³Newburgh, 10 June: 15.6 µg/m³Newburgh, 11 June: 17.7 µg/m³Newburgh, 12 June: 16.6 µg/m³Newburgh, 13 June: no readingNewburgh, 14 June: 7.5 µg/m³Newburgh, 15 June: 3.2 µg/m³Hunt ValleyHunt Valley, 28 May: 3.6 µg/m³Hunt Valley, 29 May: 6.6 µg/m³Hunt Valley, 30 May: 10.1 µg/m³Hunt Valley, 31 May: 14.9 µg/m³Hunt Valley, 1 June: 16.0 µg/m³Hunt Valley, 2 June: 15.5 µg/m³Hunt Valley, 3 June: 11.5 µg/m³Hunt Valley, 4 June: 5.3 µg/m³Hunt Valley, 5 June: 5.5 µg/m³Hunt Valley, 6 June: 25.4 µg/m³, 4.0× its usual 6.4Hunt Valley, 7 June: 66.3 µg/m³, 10× its usual 6.6Hunt Valley, 8 June: 98.5 µg/m³, 14× its usual 6.8Hunt Valley, 9 June: 19.8 µg/m³Hunt Valley, 10 June: 16.2 µg/m³Hunt Valley, 11 June: 22.1 µg/m³Hunt Valley, 12 June: 10.5 µg/m³Hunt Valley, 13 June: 6.1 µg/m³Hunt Valley, 14 June: 6.6 µg/m³Hunt Valley, 15 June: 7.7 µg/m³WaterburyWaterbury, 28 May: 7.8 µg/m³Waterbury, 29 May: 8.7 µg/m³Waterbury, 30 May: 10.9 µg/m³Waterbury, 31 May: 10.3 µg/m³Waterbury, 1 June: 17.1 µg/m³Waterbury, 2 June: 14.0 µg/m³Waterbury, 3 June: 9.2 µg/m³Waterbury, 4 June: 3.8 µg/m³Waterbury, 5 June: 5.6 µg/m³Waterbury, 6 June: 58.2 µg/m³, 9.7× its usual 6.0Waterbury, 7 June: 96.5 µg/m³, 16× its usual 6.0Waterbury, 8 June: 75.4 µg/m³, 13× its usual 6.0Waterbury, 9 June: 11.5 µg/m³Waterbury, 10 June: 6.2 µg/m³Waterbury, 11 June: 20.3 µg/m³Waterbury, 12 June: 25.2 µg/m³, 3.7× its usual 6.8Waterbury, 13 June: 6.4 µg/m³Waterbury, 14 June: 9.3 µg/m³Waterbury, 15 June: 6.0 µg/m³CornwallCornwall, 28 May: 5.9 µg/m³Cornwall, 29 May: 7.1 µg/m³Cornwall, 30 May: 9.8 µg/m³Cornwall, 31 May: 12.3 µg/m³Cornwall, 1 June: 14.6 µg/m³Cornwall, 2 June: 16.5 µg/m³Cornwall, 3 June: 7.3 µg/m³Cornwall, 4 June: 5.9 µg/m³Cornwall, 5 June: 11.8 µg/m³Cornwall, 6 June: 93.5 µg/m³, 17× its usual 5.6Cornwall, 7 June: 82.9 µg/m³, 15× its usual 5.7Cornwall, 8 June: 4.0 µg/m³Cornwall, 9 June: 5.1 µg/m³Cornwall, 10 June: 6.5 µg/m³Cornwall, 11 June: 16.9 µg/m³Cornwall, 12 June: 20.3 µg/m³Cornwall, 13 June: 10.6 µg/m³Cornwall, 14 June: 10.9 µg/m³Cornwall, 15 June: 14.6 µg/m³PittsfieldPittsfield, 28 May: 11.8 µg/m³Pittsfield, 29 May: 10.3 µg/m³Pittsfield, 30 May: 5.1 µg/m³Pittsfield, 31 May: 12.7 µg/m³Pittsfield, 1 June: 10.9 µg/m³Pittsfield, 2 June: 13.2 µg/m³Pittsfield, 3 June: 5.3 µg/m³Pittsfield, 4 June: 3.9 µg/m³Pittsfield, 5 June: 12.8 µg/m³Pittsfield, 6 June: 65.0 µg/m³, 12× its usual 5.3Pittsfield, 7 June: 80.9 µg/m³, 15× its usual 5.3Pittsfield, 8 June: 76.4 µg/m³, 14× its usual 5.3Pittsfield, 9 June: 10.0 µg/m³Pittsfield, 10 June: 6.3 µg/m³Pittsfield, 11 June: 16.9 µg/m³Pittsfield, 12 June: 24.2 µg/m³Pittsfield, 13 June: 6.6 µg/m³Pittsfield, 14 June: 8.2 µg/m³Pittsfield, 15 June: 7.0 µg/m³Toms RiverToms River, 28 May: 7.4 µg/m³Toms River, 29 May: 9.4 µg/m³Toms River, 30 May: 8.4 µg/m³Toms River, 31 May: 19.8 µg/m³Toms River, 1 June: 8.2 µg/m³Toms River, 2 June: 11.6 µg/m³Toms River, 3 June: 9.3 µg/m³Toms River, 4 June: 3.9 µg/m³Toms River, 5 June: 5.8 µg/m³Toms River, 6 June: no readingToms River, 7 June: 186.0 µg/m³, 27× its usual 6.8Toms River, 8 June: 119.0 µg/m³, 18× its usual 6.8Toms River, 9 June: 24.3 µg/m³Toms River, 10 June: 14.8 µg/m³Toms River, 11 June: 22.4 µg/m³Toms River, 12 June: 17.0 µg/m³Toms River, 13 June: 5.3 µg/m³Toms River, 14 June: 8.0 µg/m³Toms River, 15 June: 7.1 µg/m³TrentonTrenton, 28 May: 7.1 µg/m³Trenton, 29 May: 11.7 µg/m³Trenton, 30 May: 11.8 µg/m³Trenton, 31 May: 14.9 µg/m³Trenton, 1 June: 15.4 µg/m³Trenton, 2 June: 18.4 µg/m³Trenton, 3 June: no readingTrenton, 4 June: no readingTrenton, 5 June: no readingTrenton, 6 June: no readingTrenton, 7 June: 170.0 µg/m³, 22× its usual 7.7Trenton, 8 June: 97.5 µg/m³, 13× its usual 7.8Trenton, 9 June: 15.1 µg/m³Trenton, 10 June: 16.5 µg/m³Trenton, 11 June: 24.7 µg/m³Trenton, 12 June: 18.3 µg/m³Trenton, 13 June: 6.8 µg/m³Trenton, 14 June: 10.4 µg/m³Trenton, 15 June: 8.1 µg/m³ElizabethElizabeth, 28 May: 10.3 µg/m³Elizabeth, 29 May: 17.0 µg/m³Elizabeth, 30 May: 17.2 µg/m³Elizabeth, 31 May: 12.7 µg/m³Elizabeth, 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× its usual 8.7Elizabeth, 8 June: 99.6 µg/m³, 11× its usual 8.7Elizabeth, 9 June: 14.4 µg/m³Elizabeth, 10 June: 13.3 µg/m³Elizabeth, 11 June: 29.7 µg/m³, 3.3× its usual 9.0Elizabeth, 12 June: 24.3 µg/m³Elizabeth, 13 June: 13.3 µg/m³Elizabeth, 14 June: 12.9 µg/m³Elizabeth, 15 June: no readingEdgewoodEdgewood, 28 May: 6.2 µg/m³Edgewood, 29 May: 7.7 µg/m³Edgewood, 30 May: no readingEdgewood, 31 May: no readingEdgewood, 1 June: no readingEdgewood, 2 June: 17.4 µg/m³Edgewood, 3 June: 12.7 µg/m³Edgewood, 4 June: 5.0 µg/m³Edgewood, 5 June: 5.3 µg/m³Edgewood, 6 June: 22.9 µg/m³Edgewood, 7 June: 71.8 µg/m³, 13× its usual 5.7Edgewood, 8 June: 126.0 µg/m³, 22× its usual 5.8Edgewood, 9 June: 24.0 µg/m³Edgewood, 10 June: 14.5 µg/m³Edgewood, 11 June: 23.5 µg/m³Edgewood, 12 June: 15.0 µg/m³Edgewood, 13 June: 7.0 µg/m³Edgewood, 14 June: 7.7 µg/m³Edgewood, 15 June: 8.4 µg/m³South LaurelSouth Laurel, 28 May: 3.9 µg/m³South Laurel, 29 May: 4.4 µg/m³South Laurel, 30 May: 12.6 µg/m³South Laurel, 31 May: 15.7 µg/m³South Laurel, 1 June: 22.5 µg/m³South Laurel, 2 June: 21.6 µg/m³South Laurel, 3 June: 12.8 µg/m³South Laurel, 4 June: 5.3 µg/m³South Laurel, 5 June: 4.5 µg/m³South Laurel, 6 June: 24.1 µg/m³South Laurel, 7 June: 66.2 µg/m³, 11× its usual 6.0South Laurel, 8 June: 116.0 µg/m³, 19× its usual 6.1South Laurel, 9 June: 18.3 µg/m³South Laurel, 10 June: 11.8 µg/m³South Laurel, 11 June: 18.3 µg/m³South Laurel, 12 June: 9.9 µg/m³South Laurel, 13 June: 5.1 µg/m³South Laurel, 14 June: 5.8 µg/m³South Laurel, 15 June: 6.1 µg/m³East HamptonEast Hampton, 28 May: 4.9 µg/m³East Hampton, 29 May: 3.4 µg/m³East Hampton, 30 May: 18.7 µg/m³East Hampton, 31 May: 21.7 µg/m³East Hampton, 1 June: 8.7 µg/m³East Hampton, 2 June: 4.9 µg/m³East Hampton, 3 June: 8.5 µg/m³East Hampton, 4 June: 7.2 µg/m³East Hampton, 5 June: 8.9 µg/m³East Hampton, 6 June: 18.6 µg/m³East Hampton, 7 June: 88.9 µg/m³, 13× its usual 6.7East Hampton, 8 June: 28.6 µg/m³, 4.3× its usual 6.7East Hampton, 9 June: 32.6 µg/m³, 4.8× its usual 6.8East Hampton, 10 June: 33.3 µg/m³, 4.9× its usual 6.8East Hampton, 11 June: 29.2 µg/m³, 4.3× its usual 6.8East Hampton, 12 June: 13.9 µg/m³East Hampton, 13 June: 7.0 µg/m³East Hampton, 14 June: 11.5 µg/m³East Hampton, 15 June: 10.1 µg/m³New BrunswickNew Brunswick, 28 May: 6.4 µg/m³New Brunswick, 29 May: 10.3 µg/m³New Brunswick, 30 May: 13.2 µg/m³New Brunswick, 31 May: 9.9 µg/m³New Brunswick, 1 June: 14.5 µg/m³New Brunswick, 2 June: 17.3 µg/m³New Brunswick, 3 June: 16.2 µg/m³New Brunswick, 4 June: 4.5 µg/m³New Brunswick, 5 June: 8.8 µg/m³New Brunswick, 6 June: no readingNew Brunswick, 7 June: no readingNew Brunswick, 8 June: 112.0 µg/m³, 16× its usual 7.0New Brunswick, 9 June: 14.7 µg/m³New Brunswick, 10 June: 14.2 µg/m³New Brunswick, 11 June: 28.0 µg/m³, 3.9× its usual 7.2New Brunswick, 12 June: 20.7 µg/m³New Brunswick, 13 June: 6.1 µg/m³New Brunswick, 14 June: 10.1 µg/m³New Brunswick, 15 June: 8.1 µg/m³28 May301 Jun3579111315
The 60 cities with the highest readings of 261, 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
BethlehemPennsylvania, United States3 253.07 June6.142×
KingstonOntario, Canada5 210.07 June5.340×
OttawaOntario, Canada3 208.07 June5.439×
AllentownPennsylvania, United States3 239.07 June6.437×
Rouyn-NorandaQuebec, Canada3 183.03 June5.037×
SyracuseNew York, United States3 181.07 June5.235×
ElktonMaryland, United States5 185.08 June5.733×
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×
WilmingtonDelaware, United States5 170.07 June6.626×
BridgeportConnecticut, United States6 165.07 June6.426×
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×
Fort LeeNew Jersey, United States3 119.07 June6.219×
South LaurelMaryland, United States2 116.08 June6.119×
SpringfieldVirginia, United States6 128.08 June7.118×
BaltimoreMaryland, United States3 117.08 June6.718×
ElizabethNew Jersey, United States3 151.07 June8.717×
CornwallOntario, Canada2 93.56 June5.617×
AlbanyNew York, United States5 102.07 June6.217×
PatersonNew Jersey, United States3 122.07 June7.516×
WaterburyConnecticut, United States4 96.57 June6.016×
New BrunswickNew Jersey, United States2 112.08 June7.016×
WashingtonDistrict of Columbia, United States5 115.58 June7.515×
RochesterNew York, United States4 88.07 June5.715×
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 June6.815×
New LondonConnecticut, United States5 76.58 June5.314×
PeterboroughOntario, Canada5 71.75 June5.114×
Green BayWisconsin, United States2 75.94 June5.514×
Greater SudburyOntario, Canada7 78.33 June5.714×
ScaggsvilleMaryland, United States3 109.08 June8.114×
EwingNew Jersey, United States2 113.08 June8.513×
East HamptonVirginia, United States5 88.97 June6.713×
AltoonaPennsylvania, United States3 73.37 June5.513×
HagerstownMaryland, United States2 65.88 June4.813×
BuffaloNew York, United States7 91.77 June7.313×
HartfordConnecticut, United States4 74.47 June5.913×
RockvilleMaryland, United States2 72.88 June5.813×
Eau ClaireWisconsin, United States3 68.15 June5.512×
North ChicopeeMassachusetts, United States3 61.88 June4.812×
CharlottesvilleVirginia, United States6 76.28 June6.811×
ChesapeakeVirginia, United States5 78.87 June7.311×
WorcesterMassachusetts, United States3 53.36 June5.310×
Port HuronMichigan, United States6 61.97 June6.39.8×
SarniaOntario, Canada6 62.37 June6.49.7×
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×
Lincoln ParkMichigan, United States8 63.97 June7.28.9×
TaylorMichigan, United States5 58.17 June6.58.9×
WindsorOntario, Canada6 63.07 June7.28.8×
LondonOntario, Canada6 60.07 June6.98.7×
North BayOntario, Canada4 44.19 June5.18.6×
DuluthMinnesota, United States1 42.95 June4.78.6×
RichmondVirginia, United States6 55.57 June6.58.5×
YpsilantiMichigan, United States5 54.78 June6.58.4×
SpringfieldMassachusetts, United States2 51.48 June6.18.4×
KenmoreNew York, United States4 50.07 June6.08.3×
Shaker HeightsOhio, United States3 51.07 June6.28.2×
DetroitMichigan, United States6 66.27 June8.38.0×
LansingMichigan, United States5 55.08 June6.98.0×
St. CatharinesOntario, Canada7 50.97 June6.48.0×
MadisonWisconsin, United States3 44.04 June5.58.0×
Fort ThomasKentucky, United States3 45.17 June5.87.8×
MedinaOhio, United States3 48.67 June6.37.7×
MontréalQuebec, Canada1 47.66 June6.27.7×
SuperiorWisconsin, United States1 41.05 June5.47.6×
HopewellVirginia, United States6 44.87 June6.07.5×
Sault Ste. MarieOntario, Canada1 40.55 June5.47.5×
DublinOhio, United States6 50.87 June6.97.4×
CoventryRhode Island, United States3 37.26 June3.47.4×
DearbornMichigan, United States6 59.57 June8.17.3×
KitchenerOntario, Canada7 52.56 June7.37.2×
GahannaOhio, United States3 36.87 June5.17.2×
Saint CloudMinnesota, United States1 36.36 June5.17.1×
ShawiniganQuebec, Canada1 41.46 June5.97.0×
AndersonIndiana, United States6 43.77 June6.36.9×
WaukeshaWisconsin, United States3 43.44 June6.36.9×
BloomingtonIndiana, United States4 43.36 June6.36.9×
DorvalQuebec, Canada1 42.66 June6.26.9×
ProvidenceRhode Island, United States3 34.66 June4.66.9×
JenisonMichigan, United States3 45.18 June6.66.8×
BrocktonMassachusetts, United States2 39.56 June5.86.8×
Rivière-des-Prairies–Pointe-aux-TremblesQuebec, Canada1 38.56 June5.76.8×
Saint-Jean-sur-RichelieuQuebec, Canada1 34.16 June4.76.8×
AkronOhio, United States5 48.67 June7.36.7×
BarrieOntario, Canada6 48.16 June7.26.7×
ZionIllinois, United States1 36.54 June5.56.6×
Saint MichaelMinnesota, United States1 35.86 June5.46.6×
ClevelandOhio, United States5 54.97 June8.56.5×
South MilwaukeeWisconsin, United States3 39.74 June6.16.5×
DaytonOhio, United States6 49.47 June7.86.3×
RaleighNorth Carolina, United States4 46.99 June7.46.3×
ElizabethtownKentucky, United States6 37.19 June5.96.3×
BrantfordOntario, Canada7 48.37 June7.86.2×
RochesterMinnesota, United States3 42.15 June6.86.2×
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×
CincinnatiOhio, United States3 46.27 June7.85.9×
MilwaukeeWisconsin, United States3 43.94 June7.45.9×
FlintMichigan, United States4 41.37 June7.05.9×
Weirton HeightsWest Virginia, United States4 36.06 June6.15.9×
RutlandVermont, United States1 32.46 June5.55.9×
BrossardQuebec, Canada1 35.56 June6.15.8×
JohnstownPennsylvania, United States3 34.76 June6.05.8×
Lexington-FayetteKentucky, United States4 33.28 June5.75.8×
MiddletownOhio, United States6 52.57 June9.25.7×
Grand RapidsMichigan, United States4 41.38 June7.25.7×
EriePennsylvania, United States6 35.67 June6.25.7×
YoungstownOhio, United States5 38.68 June6.95.6×
Apple ValleyMinnesota, United States2 30.05 June5.45.6×
CheektowagaNew York, United States4 53.17 June9.65.5×
AshlandKentucky, United States4 38.57 June7.05.5×
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×
IndianapolisIndiana, United States6 44.87 June8.55.3×
SpringfieldOhio, United States6 43.77 June8.25.3×
WilkinsburgPennsylvania, United States6 37.36 June7.15.3×
RockfordIllinois, United States1 35.64 June6.75.3×
WarrenOhio, United States6 41.87 June8.15.2×
HamiltonOntario, Canada6 41.27 June7.95.2×
JeffersonvilleIndiana, United States6 39.26 June7.65.2×
TorontoOntario, Canada2 34.96 June6.75.2×
JeffersontownKentucky, United States5 34.16 June6.65.2×
PainesvilleOhio, United States3 31.07 June6.05.2×
Saint PaulMinnesota, United States2 30.46 June5.95.2×
ShakopeeMinnesota, United States2 30.06 June5.85.2×
MolineIllinois, United States2 29.74 June5.75.2×
QuincyMassachusetts, United States2 27.512 June5.35.2×
KeeneNew Hampshire, United States1 26.76 June5.15.2×
BlaineMinnesota, United States1 26.46 June5.15.2×
BensalemPennsylvania, United States6 40.56 June8.05.1×
ClemmonsNorth Carolina, United States4 37.66 June7.45.1×
ColumbusIndiana, United States3 35.56 June7.05.1×
LebanonOhio, United States2 35.37 June6.95.1×
MinneapolisMinnesota, United States2 31.66 June6.25.1×
BurnsvilleMinnesota, United States2 31.36 June6.15.1×
LowellMassachusetts, United States2 29.612 June5.85.1×
DerryNew Hampshire, United States1 25.312 June5.05.1×
ToledoOhio, United States4 38.77 June7.75.0×
White OakOhio, United States3 31.47 June6.35.0×
BloomingtonIllinois, United States1 30.64 June6.15.0×
PittsburghPennsylvania, United States5 35.66 June7.34.9×
ClintonIowa, United States1 32.14 June6.54.9×
ConwaySouth Carolina, United States2 30.610 June6.24.9×
RoanokeVirginia, United States4 30.07 June6.14.9×
LynnMassachusetts, United States1 27.712 June5.74.9×
RedfordMichigan, United States4 44.07 June9.24.8×
KalamazooMichigan, United States5 37.76 June7.94.8×
BostonMassachusetts, United States2 29.612 June6.24.8×
WaterlooIowa, United States2 35.35 June7.54.7×
PortsmouthNew Hampshire, United States1 27.112 June5.84.7×
HernandoMississippi, United States4 33.87 June7.44.6×
South BendIndiana, United States3 33.26 June7.24.6×
DecaturIllinois, United States3 32.84 June7.24.6×
McKeesportPennsylvania, United States4 31.86 June7.04.5×
Saint MatthewsKentucky, United States5 30.46 June6.74.5×
GranbyQuebec, Canada1 25.36 June5.64.5×
West MifflinPennsylvania, United States6 40.26 June9.14.4×
East Saint LouisIllinois, United States4 35.86 June8.14.4×
ClaytonNorth Carolina, United States4 35.89 June8.24.4×
LouisvilleKentucky, United States5 34.16 June7.74.4×
FishersIndiana, United States2 31.27 June7.14.4×
DavenportIowa, United States1 27.24 June6.24.4×
PhiladelphiaPennsylvania, United States3 36.26 June8.44.3×
MorrisvilleNorth Carolina, United States5 34.79 June8.14.3×
GreenvilleNorth Carolina, United States3 30.57 June7.14.3×
CharlestonWest Virginia, United States3 29.08 June6.84.3×
SpringdaleArkansas, United States2 39.16 June9.44.2×
OwensboroKentucky, United States5 37.68 June8.94.2×
SteubenvilleOhio, United States5 35.16 June8.34.2×
KnoxvilleTennessee, United States3 32.37 June7.74.2×
OlatheKansas, United States1 26.26 June6.34.2×
Iowa CityIowa, United States1 25.06 June5.94.2×
Des MoinesIowa, United States2 29.56 June7.24.1×
New AlbanyIndiana, United States1 25.36 June6.14.1×
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×
Kansas CityKansas, United States1 27.56 June6.84.0×
KokomoIndiana, United States5 27.49 June6.94.0×
AthensGeorgia, United States2 27.310 June6.94.0×
FayettevilleNorth Carolina, United States2 32.87 June8.53.9×
EvansvilleIndiana, United States4 31.77 June8.23.9×
AnkenyIowa, United States2 30.56 June7.93.9×
East ChicagoIndiana, United States2 28.06 June7.23.9×
NorthbrookIllinois, United States1 26.64 June6.93.9×
Valley StationKentucky, United States7 30.56 June8.13.8×
HollandMichigan, United States1 28.66 June7.53.8×
SpringfieldIllinois, United States1 27.04 June7.23.8×
LafayetteIndiana, United States1 26.46 June7.03.8×
CaryIllinois, United States2 26.24 June6.93.8×
SavannahGeorgia, United States1 25.510 June6.83.8×
LexingtonNorth Carolina, United States2 30.77 June8.43.7×
HammondIndiana, United States2 28.76 June7.73.7×
AugustaGeorgia, United States2 28.410 June7.73.7×
ElkhartIndiana, United States2 28.26 June7.63.7×
MaryvilleTennessee, United States1 28.27 June7.73.7×
DurhamNorth Carolina, United States1 27.29 June7.33.7×
PaducahKentucky, United States4 26.59 June7.13.7×
Des PlainesIllinois, United States2 26.16 June7.13.7×
La CrosseWisconsin, United States2 58.95 June16.23.6×
BirminghamAlabama, United States3 32.89 June9.23.6×
Roanoke RapidsNorth Carolina, United States3 29.39 June8.23.6×
NapervilleIllinois, United States3 27.76 June7.83.6×
JolietIllinois, United States2 27.76 June7.63.6×
TrussvilleAlabama, United States1 27.110 June7.53.6×
HendersonvilleTennessee, United States2 27.07 June7.53.6×
HuntsvilleAlabama, United States1 25.110 June7.03.6×
FlorenceSouth Carolina, United States3 29.79 June8.53.5×
LawrencevilleGeorgia, United States2 29.010 June8.43.5×
Phenix CityAlabama, United States2 28.19 June8.03.5×
GreenvilleSouth Carolina, United States1 26.47 June7.63.5×
ChattanoogaTennessee, United States3 32.09 June9.33.4×
GreensboroNorth Carolina, United States1 27.26 June7.93.4×
CharlotteNorth Carolina, United States1 27.17 June8.03.4×
St. LouisMissouri, United States4 32.16 June9.73.3×
Saint AndrewsSouth Carolina, United States2 27.89 June8.33.3×
East RidgeTennessee, United States3 30.810 June9.73.2×
SpartanburgSouth Carolina, United States2 29.47 June9.13.2×
GainesvilleGeorgia, United States3 30.010 June9.63.1×
HueytownAlabama, United States1 25.09 June8.13.1×
Terre HauteIndiana, United States2 30.76 June10.33.0×
BartlettTennessee, United States2 26.57 June8.73.0×
MaconGeorgia, United States2 26.39 June8.93.0×
Little RockArkansas, United States2 28.67 June10.22.8×

Daily means in µg/m³, over the days each city counted in this episode. Highest: its highest of those days. Usual: the city's median for the time of year of that day (its days within 21 days of the date, every year, leaving out the week around it). Above usual: its highest day against that, with a usual under 5 µg/m³ taken as 5.

Against other episodes in the United States and Canada

Number 3 of 141 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 141.

Use this page

SmogRank, Eastern United States and Canada, May and June 2023: 261 cities with PM2.5 at twice their usual or more, 31 May to 12 June 2023, smogrank.com/episodes/2023-05-eastern-united-states-and-canada (accessed 4 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.