SmogRank / Episodes / United States

North-eastern United States and Canada, July and August 2025

For 11 days, from 30 July to 9 August 2025, 241 cities in the United States and Canada had PM2.5 at least twice their usual for the time of year. The worst reading was Marquette, Michigan, United States: 112.0 µg/m³ on 30 July, about 14× its usual 8.1.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached241in 2 countries
Days1130 July to 9 August 2025
Worst day4 August119 cities counted
Furthest above usual14×Marquette

Day by day

4 August 119 cities at twice their usual or more
MedinaAkronCantonHermitageDublinGahannaColumbusWeirtonWeirton HeightsSpringfieldWilkinsburgDaytonMcKeesportLebanonMasonPortsmouthWhite OakCincinnatiFort ThomasJohnstownAshlandHuntingtonCharlestonAltoonaColumbusLexington-FayetteNicholasvilleJeffersontownSaint MatthewsHarrisonburgJeffersonvilleLouisvilleHagerstownNew AlbanyValley StationElizabethtownCharlottesvilleAshburnKingsportJasperRockvilleSpringfieldScaggsvilleWashingtonRose HillHunt ValleySouth LaurelOxon Hill-GlassmanorBaltimoreEssexOwensboroReadingEdgewoodKnoxvilleShort PumpEvansvilleAshevilleRichmondMaryvilleGreensboroAllentownElktonCookevilleNewarkBethlehemBearChesterDurhamCharlotteHendersonvilleDoverMorrisvilleSpartanburgRoanoke RapidsBensalemNashvilleGreenvilleRaleighClarksvilleEwingTrentonSouth VinelandClaytonChattanoogaEast RidgePaducahFayettevilleColumbiaBayonnePleasantvilleToms RiverAtlantic CityGreenvilleLemayHuntsvilleDecaturHolbrookJacksonDyersburgNew LondonBartlettCoventryWest MemphisHernandoProvidencePawtucketFall RiverBrocktonQuincySpringfieldLittle RockSpringdaleFort SmithTulsaJenksMcAlesterWichitaSaint JohnEdmondOklahoma CityMooreSept-ÎlesLawtonDartmouthCharlottetownMiddletownWest MifflinWestervilleWarrenWake ForestTerre HauteFishersPhiladelphiaLimaPittsburghElizabethCamdenAnn ArborLindenPennsaukenIndianapolisYoungstownWinston-SalemLancasterHarrisburgNew BrunswickJersey CityClevelandSteubenvilleSewellWilmingtonPonca CityBloomingtonRoanokeClemmonsHopewellYorkAbingtonLexingtonHickoryPatersonLincolnKokomoAndersonNepeanLebanonShaker HeightsBostonSt. LouisDerbyEast HamptonNorristownNew York CityPortlandFort WayneBridgeportLynnMuncieLafayetteCarlisleLowellToledoL'Ancienne-LoretteChesapeakePortsmouthDodge CityGranite CityLexingtonRandolphFort LeeNew HavenArnoldWyomingSorel-TracyEast Saint LouisPortageQuébecState CollegeUniversity CityAugustaCleveland HeightsShawiniganMiramichiGaryWaterlooBrossardDerrySaint JosephSouth BendWatertownHaverhillFraminghamRivière-des-Prairies–Pointe-aux-TremblesScrantonWaterburyTrois-RivièresRutlandUpper AltonRedfordDearbornElkhartAnkenyMontréalWorcesterLincoln ParkLewistonDrummondvilleGrand IslandLeawoodTaylorMonctonDanburySt. CatharinesDetroitCalumet CityGranbyChampaignDecaturFrederictonKansas CityPainesvilleHollandWinnipegYpsilantiKalamazooDes MoinesSpringfieldCornwallLaconiaHartfordSherbrookeSaint-Jean-sur-RichelieuNapervilleJolietBridgeviewWindsorPeoriaBay CityMilfordKeeneKansas CityWaterdownOakvilleMiltonLansingMichigan CityHammondOak LawnNorthbrookEdmundstonOttawaWhite PlainsHamiltonDoltonDorvalRaymoreTorontoRochesterElginBangorSpringfieldNorth ChicopeeOlatheMississaugaBuffaloColumbiaTopekaGuelphOmahaSouthfieldEast ChicagoBarrieGreenfieldLibertyBramptonAlbanyBrookingsKingstonKitchenerFranklin ParkSt. ThomasBrantfordSyracusePort HuronBloomingtonSaguenayPittsfieldNewmarketWest FargoAuroraSaint CloudNew CityUticaNewburghGrand RapidsElmwood ParkIowa CityLondonChathamJenisonAberdeenShakopeeSaint PaulBellevilleBrookfieldSarniaPeterboroughRochesterBurnsvilleErieMuscatineDavenportSioux FallsChicagoOconomowocSaint MichaelCedar RapidsNorth BayAllistonEastpointeFort DodgeBellevueGreater SudburyMinneapolisApple ValleyClintonCaryLa VistaDes PlainesRockfordMolineGreen BayMankatoDuluthBlaineSault Ste. MarieMilwaukeeWaukeshaEau ClaireSuperiorAppletonSouth MilwaukeeZionMadisonRouyn-NorandaMarquette
27 Jul301 Aug2581112
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

Rouyn-NorandaRouyn-Noranda, 27 July: 28.9 µg/m³, 3.9× usualRouyn-Noranda, 28 July: 21.7 µg/m³, 2.9× usualRouyn-Noranda, 29 July: 47.3 µg/m³, 6.3× usualRouyn-Noranda, 30 July: 42.2 µg/m³, 5.6× usualRouyn-Noranda, 31 July: 3.7 µg/m³, 0.5× usualRouyn-Noranda, 1 August: 43.6 µg/m³, 5.8× usualRouyn-Noranda, 2 August: 87.3 µg/m³, 12× usualRouyn-Noranda, 3 August: 55.5 µg/m³, 7.4× usualRouyn-Noranda, 4 August: 25.7 µg/m³, 3.4× usualRouyn-Noranda, 5 August: no readingRouyn-Noranda, 6 August: no readingRouyn-Noranda, 7 August: no readingRouyn-Noranda, 8 August: no readingRouyn-Noranda, 9 August: no readingRouyn-Noranda, 10 August: no readingRouyn-Noranda, 11 August: no readingRouyn-Noranda, 12 August: no readingMarquetteMarquette, 27 July: 8.6 µg/m³, 1.1× usualMarquette, 28 July: 11.0 µg/m³, 1.4× usualMarquette, 29 July: 42.7 µg/m³, 5.3× usualMarquette, 30 July: 112.0 µg/m³, 14× usualMarquette, 31 July: 84.7 µg/m³, 10× usualMarquette, 1 August: 58.8 µg/m³, 7.3× usualMarquette, 2 August: 62.6 µg/m³, 7.7× usualMarquette, 3 August: 38.8 µg/m³, 4.8× usualMarquette, 4 August: 33.0 µg/m³, 4.1× usualMarquette, 5 August: 40.1 µg/m³, 5.0× usualMarquette, 6 August: 40.8 µg/m³, 5.0× usualMarquette, 7 August: 19.8 µg/m³, 2.4× usualMarquette, 8 August: 12.3 µg/m³, 1.5× usualMarquette, 9 August: 7.1 µg/m³, 0.9× usualMarquette, 10 August: 6.1 µg/m³, 0.8× usualMarquette, 11 August: 9.1 µg/m³, 1.1× usualMarquette, 12 August: 14.2 µg/m³, 1.8× usualSuperiorSuperior, 27 July: 9.5 µg/m³, 0.9× usualSuperior, 28 July: 11.0 µg/m³, 1.0× usualSuperior, 29 July: 41.1 µg/m³, 3.8× usualSuperior, 30 July: 108.0 µg/m³, 10× usualSuperior, 31 July: 102.0 µg/m³, 9.4× usualSuperior, 1 August: 92.3 µg/m³, 8.5× usualSuperior, 2 August: 66.1 µg/m³, 6.1× usualSuperior, 3 August: 39.2 µg/m³, 3.6× usualSuperior, 4 August: 35.4 µg/m³, 3.3× usualSuperior, 5 August: 44.3 µg/m³, 4.1× usualSuperior, 6 August: 46.8 µg/m³, 4.3× usualSuperior, 7 August: 22.3 µg/m³, 2.1× usualSuperior, 8 August: 18.6 µg/m³, 1.7× usualSuperior, 9 August: 11.5 µg/m³, 1.1× usualSuperior, 10 August: 12.6 µg/m³, 1.2× usualSuperior, 11 August: 37.7 µg/m³, 3.5× usualSuperior, 12 August: 20.2 µg/m³, 1.9× usualDuluthDuluth, 27 July: 6.0 µg/m³, 0.6× usualDuluth, 28 July: 8.0 µg/m³, 0.8× usualDuluth, 29 July: 32.6 µg/m³, 3.3× usualDuluth, 30 July: 91.1 µg/m³, 9.1× usualDuluth, 31 July: 85.4 µg/m³, 8.5× usualDuluth, 1 August: 81.7 µg/m³, 8.2× usualDuluth, 2 August: 57.8 µg/m³, 5.8× usualDuluth, 3 August: 31.3 µg/m³, 3.1× usualDuluth, 4 August: 28.2 µg/m³, 2.8× usualDuluth, 5 August: 32.6 µg/m³, 3.3× usualDuluth, 6 August: 34.0 µg/m³, 3.4× usualDuluth, 7 August: 13.3 µg/m³, 1.3× usualDuluth, 8 August: 11.6 µg/m³, 1.2× usualDuluth, 9 August: 7.3 µg/m³, 0.7× usualDuluth, 10 August: 7.9 µg/m³, 0.8× usualDuluth, 11 August: 25.6 µg/m³, 2.6× usualDuluth, 12 August: 13.8 µg/m³, 1.4× usualOconomowocOconomowoc, 27 July: 13.6 µg/m³, 0.9× usualOconomowoc, 28 July: 8.7 µg/m³, 0.6× usualOconomowoc, 29 July: 14.1 µg/m³, 1.0× usualOconomowoc, 30 July: 39.3 µg/m³, 2.7× usualOconomowoc, 31 July: 111.0 µg/m³, 7.6× usualOconomowoc, 1 August: 46.4 µg/m³, 3.2× usualOconomowoc, 2 August: 65.0 µg/m³, 4.5× usualOconomowoc, 3 August: 77.6 µg/m³, 5.3× usualOconomowoc, 4 August: 49.9 µg/m³, 3.4× usualOconomowoc, 5 August: 48.8 µg/m³, 3.3× usualOconomowoc, 6 August: 40.2 µg/m³, 2.8× usualOconomowoc, 7 August: 25.6 µg/m³, 1.8× usualOconomowoc, 8 August: 19.8 µg/m³, 1.4× usualOconomowoc, 9 August: 19.5 µg/m³, 1.3× usualOconomowoc, 10 August: 7.6 µg/m³, 0.5× usualOconomowoc, 11 August: 9.7 µg/m³, 0.7× usualOconomowoc, 12 August: 6.7 µg/m³, 0.5× usualMankatoMankato, 27 July: 7.0 µg/m³, 0.7× usualMankato, 28 July: 6.7 µg/m³, 0.6× usualMankato, 29 July: 10.8 µg/m³, 1.0× usualMankato, 30 July: 49.9 µg/m³, 4.7× usualMankato, 31 July: 96.9 µg/m³, 9.1× usualMankato, 1 August: 95.4 µg/m³, 8.9× usualMankato, 2 August: 64.9 µg/m³, 6.1× usualMankato, 3 August: 39.0 µg/m³, 3.6× usualMankato, 4 August: 37.2 µg/m³, 3.5× usualMankato, 5 August: 21.4 µg/m³, 2.0× usualMankato, 6 August: 11.6 µg/m³, 1.1× usualMankato, 7 August: 14.1 µg/m³, 1.3× usualMankato, 8 August: 17.2 µg/m³, 1.6× usualMankato, 9 August: 10.9 µg/m³, 1.0× usualMankato, 10 August: 8.3 µg/m³, 0.8× usualMankato, 11 August: 38.2 µg/m³, 3.6× usualMankato, 12 August: 40.5 µg/m³, 3.8× usualMilwaukeeMilwaukee, 27 July: 5.6 µg/m³, 0.6× usualMilwaukee, 28 July: 7.0 µg/m³, 0.7× usualMilwaukee, 29 July: 9.6 µg/m³, 1.0× usualMilwaukee, 30 July: 30.1 µg/m³, 3.1× usualMilwaukee, 31 July: 91.1 µg/m³, 9.4× usualMilwaukee, 1 August: 39.2 µg/m³, 4.0× usualMilwaukee, 2 August: 51.0 µg/m³, 5.3× usualMilwaukee, 3 August: 68.2 µg/m³, 7.0× usualMilwaukee, 4 August: 39.1 µg/m³, 4.0× usualMilwaukee, 5 August: 48.7 µg/m³, 5.0× usualMilwaukee, 6 August: 28.7 µg/m³, 3.0× usualMilwaukee, 7 August: 16.0 µg/m³, 1.6× usualMilwaukee, 8 August: 13.3 µg/m³, 1.4× usualMilwaukee, 9 August: 11.2 µg/m³, 1.2× usualMilwaukee, 10 August: 6.4 µg/m³, 0.7× usualMilwaukee, 11 August: 7.1 µg/m³, 0.7× usualMilwaukee, 12 August: 5.7 µg/m³, 0.6× usualAppletonAppleton, 27 July: 5.5 µg/m³, 0.6× usualAppleton, 28 July: 5.3 µg/m³, 0.6× usualAppleton, 29 July: 8.4 µg/m³, 1.0× usualAppleton, 30 July: 79.1 µg/m³, 9.1× usualAppleton, 31 July: 86.9 µg/m³, 10.0× usualAppleton, 1 August: 42.6 µg/m³, 4.9× usualAppleton, 2 August: 57.4 µg/m³, 6.6× usualAppleton, 3 August: 61.4 µg/m³, 7.1× usualAppleton, 4 August: 51.4 µg/m³, 5.9× usualAppleton, 5 August: 43.5 µg/m³, 5.0× usualAppleton, 6 August: 30.3 µg/m³, 3.5× usualAppleton, 7 August: 14.9 µg/m³, 1.7× usualAppleton, 8 August: 10.7 µg/m³, 1.2× usualAppleton, 9 August: 8.2 µg/m³, 0.9× usualAppleton, 10 August: 4.2 µg/m³, 0.5× usualAppleton, 11 August: 9.1 µg/m³, 1.0× usualAppleton, 12 August: 12.4 µg/m³, 1.4× usualEau ClaireEau Claire, 27 July: 4.8 µg/m³, 0.5× usualEau Claire, 28 July: 5.6 µg/m³, 0.6× usualEau Claire, 29 July: 11.1 µg/m³, 1.2× usualEau Claire, 30 July: 59.2 µg/m³, 6.7× usualEau Claire, 31 July: 86.8 µg/m³, 9.8× usualEau Claire, 1 August: 72.9 µg/m³, 8.2× usualEau Claire, 2 August: 48.9 µg/m³, 5.5× usualEau Claire, 3 August: 37.2 µg/m³, 4.2× usualEau Claire, 4 August: 33.9 µg/m³, 3.8× usualEau Claire, 5 August: 21.8 µg/m³, 2.4× usualEau Claire, 6 August: 24.3 µg/m³, 2.7× usualEau Claire, 7 August: 10.4 µg/m³, 1.2× usualEau Claire, 8 August: 10.5 µg/m³, 1.2× usualEau Claire, 9 August: 6.3 µg/m³, 0.7× usualEau Claire, 10 August: 5.1 µg/m³, 0.6× usualEau Claire, 11 August: 14.7 µg/m³, 1.7× usualEau Claire, 12 August: 21.0 µg/m³, 2.4× usualWaukeshaWaukesha, 27 July: 5.2 µg/m³, 0.6× usualWaukesha, 28 July: 6.4 µg/m³, 0.7× usualWaukesha, 29 July: 9.6 µg/m³, 1.1× usualWaukesha, 30 July: 28.0 µg/m³, 3.1× usualWaukesha, 31 July: 86.0 µg/m³, 9.7× usualWaukesha, 1 August: 36.5 µg/m³, 4.1× usualWaukesha, 2 August: 55.4 µg/m³, 6.2× usualWaukesha, 3 August: 66.8 µg/m³, 7.5× usualWaukesha, 4 August: 39.8 µg/m³, 4.5× usualWaukesha, 5 August: 36.6 µg/m³, 4.1× usualWaukesha, 6 August: 30.6 µg/m³, 3.4× usualWaukesha, 7 August: 14.5 µg/m³, 1.6× usualWaukesha, 8 August: 10.4 µg/m³, 1.2× usualWaukesha, 9 August: 10.0 µg/m³, 1.1× usualWaukesha, 10 August: 5.1 µg/m³, 0.6× usualWaukesha, 11 August: 5.6 µg/m³, 0.6× usualWaukesha, 12 August: 4.9 µg/m³, 0.6× usualGreen BayGreen Bay, 27 July: 8.2 µg/m³, 0.9× usualGreen Bay, 28 July: 7.7 µg/m³, 0.8× usualGreen Bay, 29 July: 9.5 µg/m³, 1.0× usualGreen Bay, 30 July: 85.9 µg/m³, 9.1× usualGreen Bay, 31 July: 85.6 µg/m³, 9.1× usualGreen Bay, 1 August: 47.1 µg/m³, 5.0× usualGreen Bay, 2 August: 58.1 µg/m³, 6.2× usualGreen Bay, 3 August: 61.3 µg/m³, 6.5× usualGreen Bay, 4 August: 58.1 µg/m³, 6.2× usualGreen Bay, 5 August: 49.2 µg/m³, 5.2× usualGreen Bay, 6 August: 29.9 µg/m³, 3.2× usualGreen Bay, 7 August: 15.1 µg/m³, 1.6× usualGreen Bay, 8 August: 13.4 µg/m³, 1.4× usualGreen Bay, 9 August: 10.0 µg/m³, 1.1× usualGreen Bay, 10 August: 4.4 µg/m³, 0.5× usualGreen Bay, 11 August: 12.3 µg/m³, 1.3× usualGreen Bay, 12 August: 11.5 µg/m³, 1.2× usualMadisonMadison, 27 July: 4.3 µg/m³, 0.5× usualMadison, 28 July: 5.0 µg/m³, 0.6× usualMadison, 29 July: 9.7 µg/m³, 1.2× usualMadison, 30 July: 27.0 µg/m³, 3.4× usualMadison, 31 July: 82.4 µg/m³, 10× usualMadison, 1 August: 36.8 µg/m³, 4.6× usualMadison, 2 August: 34.0 µg/m³, 4.3× usualMadison, 3 August: 38.2 µg/m³, 4.8× usualMadison, 4 August: 39.5 µg/m³, 4.9× usualMadison, 5 August: 25.4 µg/m³, 3.2× usualMadison, 6 August: 27.2 µg/m³, 3.4× usualMadison, 7 August: 13.8 µg/m³, 1.7× usualMadison, 8 August: 10.7 µg/m³, 1.3× usualMadison, 9 August: 9.7 µg/m³, 1.2× usualMadison, 10 August: 6.7 µg/m³, 0.8× usualMadison, 11 August: 5.0 µg/m³, 0.6× usualMadison, 12 August: 8.8 µg/m³, 1.1× usualMinneapolisMinneapolis, 27 July: 5.6 µg/m³, 0.5× usualMinneapolis, 28 July: 7.2 µg/m³, 0.7× usualMinneapolis, 29 July: 9.5 µg/m³, 0.9× usualMinneapolis, 30 July: 54.0 µg/m³, 5.3× usualMinneapolis, 31 July: 71.0 µg/m³, 7.0× usualMinneapolis, 1 August: 80.7 µg/m³, 7.9× usualMinneapolis, 2 August: 48.5 µg/m³, 4.8× usualMinneapolis, 3 August: 27.6 µg/m³, 2.7× usualMinneapolis, 4 August: 28.8 µg/m³, 2.8× usualMinneapolis, 5 August: 17.4 µg/m³, 1.7× usualMinneapolis, 6 August: 13.7 µg/m³, 1.3× usualMinneapolis, 7 August: 12.8 µg/m³, 1.3× usualMinneapolis, 8 August: 12.8 µg/m³, 1.3× usualMinneapolis, 9 August: 7.6 µg/m³, 0.7× usualMinneapolis, 10 August: 8.0 µg/m³, 0.8× usualMinneapolis, 11 August: 27.3 µg/m³, 2.7× usualMinneapolis, 12 August: 22.6 µg/m³, 2.2× usualBlaineBlaine, 27 July: 5.2 µg/m³, 0.6× usualBlaine, 28 July: 6.4 µg/m³, 0.7× usualBlaine, 29 July: 8.4 µg/m³, 1.0× usualBlaine, 30 July: 49.7 µg/m³, 5.7× usualBlaine, 31 July: 70.0 µg/m³, 8.0× usualBlaine, 1 August: 79.3 µg/m³, 9.1× usualBlaine, 2 August: 50.5 µg/m³, 5.8× usualBlaine, 3 August: 27.3 µg/m³, 3.1× usualBlaine, 4 August: 30.0 µg/m³, 3.4× usualBlaine, 5 August: 17.7 µg/m³, 2.0× usualBlaine, 6 August: 12.9 µg/m³, 1.5× usualBlaine, 7 August: 10.7 µg/m³, 1.2× usualBlaine, 8 August: 10.4 µg/m³, 1.2× usualBlaine, 9 August: 6.7 µg/m³, 0.8× usualBlaine, 10 August: 7.6 µg/m³, 0.9× usualBlaine, 11 August: 26.3 µg/m³, 3.0× usualBlaine, 12 August: 17.3 µg/m³, 2.0× usualRochesterRochester, 27 July: 5.8 µg/m³, 0.6× usualRochester, 28 July: 4.8 µg/m³, 0.5× usualRochester, 29 July: 10.1 µg/m³, 1.0× usualRochester, 30 July: 41.9 µg/m³, 4.1× usualRochester, 31 July: 76.2 µg/m³, 7.4× usualRochester, 1 August: 71.0 µg/m³, 6.9× usualRochester, 2 August: 39.7 µg/m³, 3.9× usualRochester, 3 August: 27.5 µg/m³, 2.7× usualRochester, 4 August: 32.5 µg/m³, 3.2× usualRochester, 5 August: 16.5 µg/m³, 1.6× usualRochester, 6 August: 15.5 µg/m³, 1.5× usualRochester, 7 August: 11.9 µg/m³, 1.2× usualRochester, 8 August: 12.3 µg/m³, 1.2× usualRochester, 9 August: 7.4 µg/m³, 0.7× usualRochester, 10 August: 4.9 µg/m³, 0.5× usualRochester, 11 August: 15.6 µg/m³, 1.5× usualRochester, 12 August: 21.9 µg/m³, 2.1× usualBurnsvilleBurnsville, 27 July: 5.1 µg/m³, 0.5× usualBurnsville, 28 July: 6.0 µg/m³, 0.6× usualBurnsville, 29 July: no readingBurnsville, 30 July: 53.8 µg/m³, 5.3× usualBurnsville, 31 July: 73.2 µg/m³, 7.2× usualBurnsville, 1 August: 75.1 µg/m³, 7.4× usualBurnsville, 2 August: 47.4 µg/m³, 4.7× usualBurnsville, 3 August: 27.4 µg/m³, 2.7× usualBurnsville, 4 August: 31.6 µg/m³, 3.1× usualBurnsville, 5 August: 17.5 µg/m³, 1.7× usualBurnsville, 6 August: 13.8 µg/m³, 1.4× usualBurnsville, 7 August: 11.9 µg/m³, 1.2× usualBurnsville, 8 August: 11.9 µg/m³, 1.2× usualBurnsville, 9 August: 6.6 µg/m³, 0.7× usualBurnsville, 10 August: 5.9 µg/m³, 0.6× usualBurnsville, 11 August: 25.8 µg/m³, 2.6× usualBurnsville, 12 August: 27.7 µg/m³, 2.7× usualSaint PaulSaint Paul, 27 July: 5.2 µg/m³, 0.5× usualSaint Paul, 28 July: 6.1 µg/m³, 0.6× usualSaint Paul, 29 July: 9.2 µg/m³, 0.9× usualSaint Paul, 30 July: 53.3 µg/m³, 5.3× usualSaint Paul, 31 July: 65.1 µg/m³, 6.4× usualSaint Paul, 1 August: 73.0 µg/m³, 7.2× usualSaint Paul, 2 August: 45.6 µg/m³, 4.5× usualSaint Paul, 3 August: 24.1 µg/m³, 2.4× usualSaint Paul, 4 August: 28.8 µg/m³, 2.9× usualSaint Paul, 5 August: 16.3 µg/m³, 1.6× usualSaint Paul, 6 August: 13.9 µg/m³, 1.4× usualSaint Paul, 7 August: 11.5 µg/m³, 1.1× usualSaint Paul, 8 August: 11.6 µg/m³, 1.1× usualSaint Paul, 9 August: 6.8 µg/m³, 0.7× usualSaint Paul, 10 August: 7.4 µg/m³, 0.7× usualSaint Paul, 11 August: 24.2 µg/m³, 2.4× usualSaint Paul, 12 August: 22.5 µg/m³, 2.2× usualSault Ste. MarieSault Ste. Marie, 27 July: 12.8 µg/m³, 1.7× usualSault Ste. Marie, 28 July: 12.6 µg/m³, 1.6× usualSault Ste. Marie, 29 July: 19.5 µg/m³, 2.5× usualSault Ste. Marie, 30 July: 71.6 µg/m³, 9.3× usualSault Ste. Marie, 31 July: 32.2 µg/m³, 4.2× usualSault Ste. Marie, 1 August: 34.2 µg/m³, 4.4× usualSault Ste. Marie, 2 August: 60.0 µg/m³, 7.8× usualSault Ste. Marie, 3 August: 50.3 µg/m³, 6.5× usualSault Ste. Marie, 4 August: 34.7 µg/m³, 4.5× usualSault Ste. Marie, 5 August: 39.9 µg/m³, 5.2× usualSault Ste. Marie, 6 August: 35.3 µg/m³, 4.6× usualSault Ste. Marie, 7 August: 25.5 µg/m³, 3.3× usualSault Ste. Marie, 8 August: 11.9 µg/m³, 1.5× usualSault Ste. Marie, 9 August: 9.5 µg/m³, 1.2× usualSault Ste. Marie, 10 August: 6.4 µg/m³, 0.8× usualSault Ste. Marie, 11 August: 6.4 µg/m³, 0.8× usualSault Ste. Marie, 12 August: 7.3 µg/m³, 0.9× usualSaint MichaelSaint Michael, 27 July: 4.8 µg/m³, 0.5× usualSaint Michael, 28 July: 6.3 µg/m³, 0.7× usualSaint Michael, 29 July: 8.2 µg/m³, 0.9× usualSaint Michael, 30 July: 46.3 µg/m³, 5.1× usualSaint Michael, 31 July: 61.6 µg/m³, 6.8× usualSaint Michael, 1 August: 69.3 µg/m³, 7.6× usualSaint Michael, 2 August: 46.9 µg/m³, 5.2× usualSaint Michael, 3 August: 28.9 µg/m³, 3.2× usualSaint Michael, 4 August: 26.0 µg/m³, 2.9× usualSaint Michael, 5 August: 16.6 µg/m³, 1.8× usualSaint Michael, 6 August: 9.5 µg/m³, 1.0× usualSaint Michael, 7 August: 8.7 µg/m³, 1.0× usualSaint Michael, 8 August: 11.0 µg/m³, 1.2× usualSaint Michael, 9 August: 5.6 µg/m³, 0.6× usualSaint Michael, 10 August: 6.7 µg/m³, 0.7× usualSaint Michael, 11 August: no readingSaint Michael, 12 August: 11.4 µg/m³, 1.3× usualShakopeeShakopee, 27 July: 5.0 µg/m³, 0.5× usualShakopee, 28 July: 5.9 µg/m³, 0.6× usualShakopee, 29 July: 8.5 µg/m³, 0.9× usualShakopee, 30 July: 49.4 µg/m³, 5.1× usualShakopee, 31 July: 68.9 µg/m³, 7.2× usualShakopee, 1 August: 68.7 µg/m³, 7.2× usualShakopee, 2 August: 44.1 µg/m³, 4.6× usualShakopee, 3 August: 27.0 µg/m³, 2.8× usualShakopee, 4 August: 28.9 µg/m³, 3.0× usualShakopee, 5 August: 16.9 µg/m³, 1.8× usualShakopee, 6 August: 10.5 µg/m³, 1.1× usualShakopee, 7 August: 11.1 µg/m³, 1.2× usualShakopee, 8 August: 11.3 µg/m³, 1.2× usualShakopee, 9 August: 7.0 µg/m³, 0.7× usualShakopee, 10 August: 6.6 µg/m³, 0.7× usualShakopee, 11 August: 27.7 µg/m³, 2.9× usualShakopee, 12 August: 25.2 µg/m³, 2.6× usualWest FargoWest Fargo, 27 July: no readingWest Fargo, 28 July: no readingWest Fargo, 29 July: no readingWest Fargo, 30 July: 58.3 µg/m³, 6.0× usualWest Fargo, 31 July: 67.2 µg/m³, 6.9× usualWest Fargo, 1 August: 55.0 µg/m³, 5.7× usualWest Fargo, 2 August: 47.4 µg/m³, 4.9× usualWest Fargo, 3 August: 26.8 µg/m³, 2.8× usualWest Fargo, 4 August: 19.8 µg/m³, 2.0× usualWest Fargo, 5 August: 11.9 µg/m³, 1.2× usualWest Fargo, 6 August: 3.8 µg/m³, 0.4× usualWest Fargo, 7 August: 4.6 µg/m³, 0.5× usualWest Fargo, 8 August: 3.8 µg/m³, 0.4× usualWest Fargo, 9 August: 3.4 µg/m³, 0.4× usualWest Fargo, 10 August: 12.2 µg/m³, 1.3× usualWest Fargo, 11 August: 58.0 µg/m³, 6.0× usualWest Fargo, 12 August: 17.3 µg/m³, 1.8× usualApple ValleyApple Valley, 27 July: 4.1 µg/m³, 0.5× usualApple Valley, 28 July: 5.4 µg/m³, 0.6× usualApple Valley, 29 July: 7.9 µg/m³, 0.9× usualApple Valley, 30 July: 46.0 µg/m³, 5.5× usualApple Valley, 31 July: 65.5 µg/m³, 7.8× usualApple Valley, 1 August: 66.1 µg/m³, 7.9× usualApple Valley, 2 August: 40.4 µg/m³, 4.8× usualApple Valley, 3 August: 23.9 µg/m³, 2.8× usualApple Valley, 4 August: 27.9 µg/m³, 3.3× usualApple Valley, 5 August: 14.9 µg/m³, 1.8× usualApple Valley, 6 August: 11.5 µg/m³, 1.4× usualApple Valley, 7 August: 9.9 µg/m³, 1.2× usualApple Valley, 8 August: 9.3 µg/m³, 1.1× usualApple Valley, 9 August: 5.8 µg/m³, 0.7× usualApple Valley, 10 August: 4.7 µg/m³, 0.6× usualApple Valley, 11 August: 21.2 µg/m³, 2.5× usualApple Valley, 12 August: 23.6 µg/m³, 2.8× usualSaint CloudSaint Cloud, 27 July: 4.9 µg/m³, 0.5× usualSaint Cloud, 28 July: 6.1 µg/m³, 0.7× usualSaint Cloud, 29 July: 9.8 µg/m³, 1.1× usualSaint Cloud, 30 July: 53.4 µg/m³, 5.9× usualSaint Cloud, 31 July: 57.1 µg/m³, 6.3× usualSaint Cloud, 1 August: 63.7 µg/m³, 7.0× usualSaint Cloud, 2 August: 51.5 µg/m³, 5.7× usualSaint Cloud, 3 August: 30.8 µg/m³, 3.4× usualSaint Cloud, 4 August: 23.4 µg/m³, 2.6× usualSaint Cloud, 5 August: 17.5 µg/m³, 1.9× usualSaint Cloud, 6 August: 8.1 µg/m³, 0.9× usualSaint Cloud, 7 August: 7.2 µg/m³, 0.8× usualSaint Cloud, 8 August: 10.2 µg/m³, 1.1× usualSaint Cloud, 9 August: 4.5 µg/m³, 0.5× usualSaint Cloud, 10 August: 9.1 µg/m³, 1.0× usualSaint Cloud, 11 August: 46.6 µg/m³, 5.1× usualSaint Cloud, 12 August: 9.0 µg/m³, 1.0× usualGreater SudburyGreater Sudbury, 27 July: 22.4 µg/m³, 2.8× usualGreater Sudbury, 28 July: 8.3 µg/m³, 1.0× usualGreater Sudbury, 29 July: 11.1 µg/m³, 1.4× usualGreater Sudbury, 30 July: 63.1 µg/m³, 7.9× usualGreater Sudbury, 31 July: 11.8 µg/m³, 1.5× usualGreater Sudbury, 1 August: 7.4 µg/m³, 0.9× usualGreater Sudbury, 2 August: 46.3 µg/m³, 5.8× usualGreater Sudbury, 3 August: 49.3 µg/m³, 6.2× usualGreater Sudbury, 4 August: 21.8 µg/m³, 2.7× usualGreater Sudbury, 5 August: 6.6 µg/m³, 0.8× usualGreater Sudbury, 6 August: 17.7 µg/m³, 2.2× usualGreater Sudbury, 7 August: 25.8 µg/m³, 3.2× usualGreater Sudbury, 8 August: 13.3 µg/m³, 1.7× usualGreater Sudbury, 9 August: 10.9 µg/m³, 1.4× usualGreater Sudbury, 10 August: 11.7 µg/m³, 1.5× usualGreater Sudbury, 11 August: 11.1 µg/m³, 1.4× usualGreater Sudbury, 12 August: 8.8 µg/m³, 1.1× usualWindsorWindsor, 27 July: 10.4 µg/m³, 1.0× usualWindsor, 28 July: 9.2 µg/m³, 0.9× usualWindsor, 29 July: 13.6 µg/m³, 1.3× usualWindsor, 30 July: 25.9 µg/m³, 2.4× usualWindsor, 31 July: 54.5 µg/m³, 5.1× usualWindsor, 1 August: 19.2 µg/m³, 1.8× usualWindsor, 2 August: 9.6 µg/m³, 0.9× usualWindsor, 3 August: 27.5 µg/m³, 2.6× usualWindsor, 4 August: 61.9 µg/m³, 5.8× usualWindsor, 5 August: 39.9 µg/m³, 3.8× usualWindsor, 6 August: 28.3 µg/m³, 2.7× usualWindsor, 7 August: 20.4 µg/m³, 1.9× usualWindsor, 8 August: 13.6 µg/m³, 1.3× usualWindsor, 9 August: 15.2 µg/m³, 1.4× usualWindsor, 10 August: 16.8 µg/m³, 1.6× usualWindsor, 11 August: 14.7 µg/m³, 1.4× usualWindsor, 12 August: 15.5 µg/m³, 1.5× usualNewmarketNewmarket, 27 July: 9.8 µg/m³, 1.1× usualNewmarket, 28 July: 13.0 µg/m³, 1.5× usualNewmarket, 29 July: 8.5 µg/m³, 1.0× usualNewmarket, 30 July: 25.3 µg/m³, 2.9× usualNewmarket, 31 July: 46.8 µg/m³, 5.4× usualNewmarket, 1 August: 6.3 µg/m³, 0.7× usualNewmarket, 2 August: 21.0 µg/m³, 2.4× usualNewmarket, 3 August: 60.2 µg/m³, 6.9× usualNewmarket, 4 August: 48.5 µg/m³, 5.6× usualNewmarket, 5 August: 38.6 µg/m³, 4.4× usualNewmarket, 6 August: 34.1 µg/m³, 3.9× usualNewmarket, 7 August: 37.2 µg/m³, 4.3× usualNewmarket, 8 August: 30.3 µg/m³, 3.5× usualNewmarket, 9 August: 21.9 µg/m³, 2.5× usualNewmarket, 10 August: 18.7 µg/m³, 2.1× usualNewmarket, 11 August: 18.2 µg/m³, 2.1× usualNewmarket, 12 August: 12.0 µg/m³, 1.4× usualSouth MilwaukeeSouth Milwaukee, 27 July: 4.4 µg/m³, 0.5× usualSouth Milwaukee, 28 July: 6.1 µg/m³, 0.8× usualSouth Milwaukee, 29 July: 7.9 µg/m³, 1.0× usualSouth Milwaukee, 30 July: 24.0 µg/m³, 3.0× usualSouth Milwaukee, 31 July: 82.9 µg/m³, 10× usualSouth Milwaukee, 1 August: 36.4 µg/m³, 4.5× usualSouth Milwaukee, 2 August: 40.5 µg/m³, 5.0× usualSouth Milwaukee, 3 August: 53.3 µg/m³, 6.6× usualSouth Milwaukee, 4 August: 35.4 µg/m³, 4.4× usualSouth Milwaukee, 5 August: 43.0 µg/m³, 5.3× usualSouth Milwaukee, 6 August: 25.0 µg/m³, 3.1× usualSouth Milwaukee, 7 August: 13.9 µg/m³, 1.7× usualSouth Milwaukee, 8 August: 11.3 µg/m³, 1.4× usualSouth Milwaukee, 9 August: 9.7 µg/m³, 1.2× usualSouth Milwaukee, 10 August: 5.1 µg/m³, 0.6× usualSouth Milwaukee, 11 August: 6.2 µg/m³, 0.8× usualSouth Milwaukee, 12 August: 5.2 µg/m³, 0.6× usualRockfordRockford, 27 July: 5.9 µg/m³, 0.6× usualRockford, 28 July: 6.4 µg/m³, 0.7× usualRockford, 29 July: 8.6 µg/m³, 0.9× usualRockford, 30 July: 10.9 µg/m³, 1.1× usualRockford, 31 July: 79.8 µg/m³, 8.3× usualRockford, 1 August: 42.6 µg/m³, 4.4× usualRockford, 2 August: 33.4 µg/m³, 3.5× usualRockford, 3 August: 41.3 µg/m³, 4.3× usualRockford, 4 August: 33.7 µg/m³, 3.5× usualRockford, 5 August: 25.6 µg/m³, 2.7× usualRockford, 6 August: 28.6 µg/m³, 3.0× usualRockford, 7 August: 13.4 µg/m³, 1.4× usualRockford, 8 August: 12.9 µg/m³, 1.3× usualRockford, 9 August: 12.9 µg/m³, 1.3× usualRockford, 10 August: 8.6 µg/m³, 0.9× usualRockford, 11 August: 6.4 µg/m³, 0.7× usualRockford, 12 August: 5.8 µg/m³, 0.6× usualZionZion, 27 July: 3.9 µg/m³, 0.5× usualZion, 28 July: 5.8 µg/m³, 0.8× usualZion, 29 July: 7.3 µg/m³, 1.0× usualZion, 30 July: 14.7 µg/m³, 1.9× usualZion, 31 July: 77.5 µg/m³, 10× usualZion, 1 August: 37.8 µg/m³, 5.0× usualZion, 2 August: 34.9 µg/m³, 4.6× usualZion, 3 August: 41.8 µg/m³, 5.5× usualZion, 4 August: 29.9 µg/m³, 3.9× usualZion, 5 August: 39.6 µg/m³, 5.2× usualZion, 6 August: 21.9 µg/m³, 2.9× usualZion, 7 August: 12.9 µg/m³, 1.7× usualZion, 8 August: 11.7 µg/m³, 1.5× usualZion, 9 August: 9.9 µg/m³, 1.3× usualZion, 10 August: 5.1 µg/m³, 0.7× usualZion, 11 August: 6.2 µg/m³, 0.8× usualZion, 12 August: 4.2 µg/m³, 0.6× usualFranklin ParkFranklin Park, 27 July: 9.1 µg/m³, 0.8× usualFranklin Park, 28 July: 10.6 µg/m³, 0.9× usualFranklin Park, 29 July: 11.8 µg/m³, 1.0× usualFranklin Park, 30 July: 12.8 µg/m³, 1.1× usualFranklin Park, 31 July: 76.9 µg/m³, 6.7× usualFranklin Park, 1 August: 52.0 µg/m³, 4.6× usualFranklin Park, 2 August: 31.6 µg/m³, 2.8× usualFranklin Park, 3 August: 38.3 µg/m³, 3.4× usualFranklin Park, 4 August: 31.1 µg/m³, 2.7× usualFranklin Park, 5 August: 32.4 µg/m³, 2.8× usualFranklin Park, 6 August: 37.1 µg/m³, 3.3× usualFranklin Park, 7 August: 18.2 µg/m³, 1.6× usualFranklin Park, 8 August: 15.5 µg/m³, 1.4× usualFranklin Park, 9 August: 14.0 µg/m³, 1.2× usualFranklin Park, 10 August: 11.0 µg/m³, 1.0× usualFranklin Park, 11 August: 10.6 µg/m³, 0.9× usualFranklin Park, 12 August: 9.5 µg/m³, 0.8× usualMolineMoline, 27 July: 6.2 µg/m³, 0.7× usualMoline, 28 July: 5.2 µg/m³, 0.6× usualMoline, 29 July: 6.2 µg/m³, 0.7× usualMoline, 30 July: 5.5 µg/m³, 0.6× usualMoline, 31 July: 76.0 µg/m³, 8.6× usualMoline, 1 August: 59.2 µg/m³, 6.7× usualMoline, 2 August: 32.5 µg/m³, 3.7× usualMoline, 3 August: 29.7 µg/m³, 3.4× usualMoline, 4 August: 21.1 µg/m³, 2.4× usualMoline, 5 August: 18.4 µg/m³, 2.1× usualMoline, 6 August: 19.4 µg/m³, 2.2× usualMoline, 7 August: 13.0 µg/m³, 1.5× usualMoline, 8 August: 12.6 µg/m³, 1.4× usualMoline, 9 August: 11.9 µg/m³, 1.4× usualMoline, 10 August: 8.6 µg/m³, 1.0× usualMoline, 11 August: 7.1 µg/m³, 0.8× usualMoline, 12 August: 5.8 µg/m³, 0.7× usualDes PlainesDes Plaines, 27 July: 8.4 µg/m³, 0.9× usualDes Plaines, 28 July: 9.7 µg/m³, 1.1× usualDes Plaines, 29 July: 10.7 µg/m³, 1.2× usualDes Plaines, 30 July: 12.4 µg/m³, 1.3× usualDes Plaines, 31 July: 75.8 µg/m³, 8.2× usualDes Plaines, 1 August: 47.7 µg/m³, 5.2× usualDes Plaines, 2 August: 31.3 µg/m³, 3.4× usualDes Plaines, 3 August: 38.1 µg/m³, 4.1× usualDes Plaines, 4 August: 29.7 µg/m³, 3.2× usualDes Plaines, 5 August: 32.0 µg/m³, 3.5× usualDes Plaines, 6 August: 33.2 µg/m³, 3.6× usualDes Plaines, 7 August: 18.0 µg/m³, 2.0× usualDes Plaines, 8 August: 15.2 µg/m³, 1.7× usualDes Plaines, 9 August: 14.0 µg/m³, 1.5× usualDes Plaines, 10 August: 10.2 µg/m³, 1.1× usualDes Plaines, 11 August: 9.2 µg/m³, 1.0× usualDes Plaines, 12 August: 8.1 µg/m³, 0.9× usualCaryCary, 27 July: 6.5 µg/m³, 0.7× usualCary, 28 July: 8.1 µg/m³, 0.9× usualCary, 29 July: 8.1 µg/m³, 0.9× usualCary, 30 July: 11.0 µg/m³, 1.2× usualCary, 31 July: 75.0 µg/m³, 8.1× usualCary, 1 August: 42.0 µg/m³, 4.5× usualCary, 2 August: 32.0 µg/m³, 3.4× usualCary, 3 August: 40.3 µg/m³, 4.3× usualCary, 4 August: 29.2 µg/m³, 3.1× usualCary, 5 August: 26.0 µg/m³, 2.8× usualCary, 6 August: 28.8 µg/m³, 3.1× usualCary, 7 August: 15.4 µg/m³, 1.7× usualCary, 8 August: 12.8 µg/m³, 1.4× usualCary, 9 August: 12.6 µg/m³, 1.4× usualCary, 10 August: 8.4 µg/m³, 0.9× usualCary, 11 August: 6.9 µg/m³, 0.7× usualCary, 12 August: 5.3 µg/m³, 0.6× usualFort DodgeFort Dodge, 27 July: 4.7 µg/m³, 0.5× usualFort Dodge, 28 July: 5.0 µg/m³, 0.5× usualFort Dodge, 29 July: 7.9 µg/m³, 0.8× usualFort Dodge, 30 July: 12.2 µg/m³, 1.3× usualFort Dodge, 31 July: 74.8 µg/m³, 7.8× usualFort Dodge, 1 August: 67.3 µg/m³, 7.0× usualFort Dodge, 2 August: 45.5 µg/m³, 4.7× usualFort Dodge, 3 August: 26.1 µg/m³, 2.7× usualFort Dodge, 4 August: 22.5 µg/m³, 2.3× usualFort Dodge, 5 August: 11.8 µg/m³, 1.2× usualFort Dodge, 6 August: 8.4 µg/m³, 0.9× usualFort Dodge, 7 August: 9.2 µg/m³, 1.0× usualFort Dodge, 8 August: 11.2 µg/m³, 1.2× usualFort Dodge, 9 August: 8.0 µg/m³, 0.8× usualFort Dodge, 10 August: 6.8 µg/m³, 0.7× usualFort Dodge, 11 August: 21.2 µg/m³, 2.2× usualFort Dodge, 12 August: 20.2 µg/m³, 2.1× usualClintonClinton, 27 July: 5.1 µg/m³, 0.6× usualClinton, 28 July: 4.9 µg/m³, 0.5× usualClinton, 29 July: 5.6 µg/m³, 0.6× usualClinton, 30 July: 5.7 µg/m³, 0.6× usualClinton, 31 July: 73.9 µg/m³, 8.0× usualClinton, 1 August: 48.4 µg/m³, 5.3× usualClinton, 2 August: 29.8 µg/m³, 3.2× usualClinton, 3 August: 28.8 µg/m³, 3.1× usualClinton, 4 August: 23.6 µg/m³, 2.6× usualClinton, 5 August: 18.3 µg/m³, 2.0× usualClinton, 6 August: 18.2 µg/m³, 2.0× usualClinton, 7 August: 9.9 µg/m³, 1.1× usualClinton, 8 August: 10.5 µg/m³, 1.1× usualClinton, 9 August: 11.0 µg/m³, 1.2× usualClinton, 10 August: 7.1 µg/m³, 0.8× usualClinton, 11 August: 6.4 µg/m³, 0.7× usualClinton, 12 August: 5.2 µg/m³, 0.6× usualElginElgin, 27 July: 6.7 µg/m³, 0.6× usualElgin, 28 July: 7.7 µg/m³, 0.7× usualElgin, 29 July: 9.2 µg/m³, 0.8× usualElgin, 30 July: 10.1 µg/m³, 0.9× usualElgin, 31 July: 73.7 µg/m³, 6.3× usualElgin, 1 August: 49.8 µg/m³, 4.3× usualElgin, 2 August: 33.3 µg/m³, 2.8× usualElgin, 3 August: 39.0 µg/m³, 3.3× usualElgin, 4 August: 29.6 µg/m³, 2.5× usualElgin, 5 August: 26.3 µg/m³, 2.2× usualElgin, 6 August: 29.7 µg/m³, 2.5× usualElgin, 7 August: 14.5 µg/m³, 1.2× usualElgin, 8 August: 13.2 µg/m³, 1.1× usualElgin, 9 August: 12.3 µg/m³, 1.1× usualElgin, 10 August: 9.1 µg/m³, 0.8× usualElgin, 11 August: 7.1 µg/m³, 0.6× usualElgin, 12 August: 5.8 µg/m³, 0.5× usualGrand RapidsGrand Rapids, 27 July: 7.4 µg/m³, 0.7× usualGrand Rapids, 28 July: 8.3 µg/m³, 0.8× usualGrand Rapids, 29 July: 7.9 µg/m³, 0.8× usualGrand Rapids, 30 July: 23.1 µg/m³, 2.2× usualGrand Rapids, 31 July: 73.2 µg/m³, 7.1× usualGrand Rapids, 1 August: 24.7 µg/m³, 2.4× usualGrand Rapids, 2 August: 43.2 µg/m³, 4.2× usualGrand Rapids, 3 August: 56.0 µg/m³, 5.4× usualGrand Rapids, 4 August: 39.3 µg/m³, 3.8× usualGrand Rapids, 5 August: 42.8 µg/m³, 4.2× usualGrand Rapids, 6 August: 24.4 µg/m³, 2.4× usualGrand Rapids, 7 August: 11.9 µg/m³, 1.2× usualGrand Rapids, 8 August: 11.0 µg/m³, 1.1× usualGrand Rapids, 9 August: 11.2 µg/m³, 1.1× usualGrand Rapids, 10 August: 7.1 µg/m³, 0.7× usualGrand Rapids, 11 August: 8.2 µg/m³, 0.8× usualGrand Rapids, 12 August: 5.7 µg/m³, 0.6× usualColumbiaColumbia, 27 July: 13.5 µg/m³, 1.2× usualColumbia, 28 July: 13.5 µg/m³, 1.2× usualColumbia, 29 July: 9.2 µg/m³, 0.8× usualColumbia, 30 July: 5.9 µg/m³, 0.5× usualColumbia, 31 July: 29.6 µg/m³, 2.6× usualColumbia, 1 August: 72.5 µg/m³, 6.4× usualColumbia, 2 August: 46.3 µg/m³, 4.1× usualColumbia, 3 August: 23.5 µg/m³, 2.1× usualColumbia, 4 August: 15.5 µg/m³, 1.4× usualColumbia, 5 August: 17.9 µg/m³, 1.6× usualColumbia, 6 August: 22.1 µg/m³, 1.9× usualColumbia, 7 August: 22.5 µg/m³, 2.0× usualColumbia, 8 August: 18.7 µg/m³, 1.6× usualColumbia, 9 August: 21.0 µg/m³, 1.8× usualColumbia, 10 August: 13.8 µg/m³, 1.2× usualColumbia, 11 August: 13.1 µg/m³, 1.1× usualColumbia, 12 August: no readingElmwood ParkElmwood Park, 27 July: 7.4 µg/m³, 0.7× usualElmwood Park, 28 July: 9.2 µg/m³, 0.9× usualElmwood Park, 29 July: 11.3 µg/m³, 1.1× usualElmwood Park, 30 July: 11.7 µg/m³, 1.1× usualElmwood Park, 31 July: 72.0 µg/m³, 7.1× usualElmwood Park, 1 August: 48.6 µg/m³, 4.8× usualElmwood Park, 2 August: 28.6 µg/m³, 2.8× usualElmwood Park, 3 August: 34.0 µg/m³, 3.3× usualElmwood Park, 4 August: 27.7 µg/m³, 2.7× usualElmwood Park, 5 August: 32.9 µg/m³, 3.2× usualElmwood Park, 6 August: 33.3 µg/m³, 3.3× usualElmwood Park, 7 August: 18.9 µg/m³, 1.9× usualElmwood Park, 8 August: 15.3 µg/m³, 1.5× usualElmwood Park, 9 August: 14.3 µg/m³, 1.4× usualElmwood Park, 10 August: 10.6 µg/m³, 1.0× usualElmwood Park, 11 August: 9.1 µg/m³, 0.9× usualElmwood Park, 12 August: 8.0 µg/m³, 0.8× usualChicagoChicago, 27 July: 7.9 µg/m³, 0.9× usualChicago, 28 July: 9.3 µg/m³, 1.0× usualChicago, 29 July: 11.1 µg/m³, 1.2× usualChicago, 30 July: 12.4 µg/m³, 1.3× usualChicago, 31 July: 69.7 µg/m³, 7.6× usualChicago, 1 August: 47.9 µg/m³, 5.2× usualChicago, 2 August: 26.2 µg/m³, 2.8× usualChicago, 3 August: 33.6 µg/m³, 3.7× usualChicago, 4 August: 22.2 µg/m³, 2.4× usualChicago, 5 August: 32.4 µg/m³, 3.5× usualChicago, 6 August: 35.0 µg/m³, 3.8× usualChicago, 7 August: 17.6 µg/m³, 1.9× usualChicago, 8 August: 14.3 µg/m³, 1.6× usualChicago, 9 August: 13.2 µg/m³, 1.4× usualChicago, 10 August: 10.4 µg/m³, 1.1× usualChicago, 11 August: 8.7 µg/m³, 0.9× usualChicago, 12 August: 8.3 µg/m³, 0.9× usualBridgeviewBridgeview, 27 July: 8.5 µg/m³, 0.7× usualBridgeview, 28 July: 9.2 µg/m³, 0.8× usualBridgeview, 29 July: 11.7 µg/m³, 1.0× usualBridgeview, 30 July: 13.9 µg/m³, 1.2× usualBridgeview, 31 July: 68.0 µg/m³, 5.8× usualBridgeview, 1 August: 52.2 µg/m³, 4.5× usualBridgeview, 2 August: 26.8 µg/m³, 2.3× usualBridgeview, 3 August: 32.2 µg/m³, 2.8× usualBridgeview, 4 August: 22.6 µg/m³, 1.9× usualBridgeview, 5 August: 30.8 µg/m³, 2.6× usualBridgeview, 6 August: 33.4 µg/m³, 2.9× usualBridgeview, 7 August: 14.9 µg/m³, 1.3× usualBridgeview, 8 August: 13.8 µg/m³, 1.2× usualBridgeview, 9 August: 12.7 µg/m³, 1.1× usualBridgeview, 10 August: 10.0 µg/m³, 0.9× usualBridgeview, 11 August: 8.7 µg/m³, 0.7× usualBridgeview, 12 August: 8.6 µg/m³, 0.7× usualJenisonJenison, 27 July: 6.3 µg/m³, 0.7× usualJenison, 28 July: 6.8 µg/m³, 0.7× usualJenison, 29 July: 7.3 µg/m³, 0.8× usualJenison, 30 July: 21.1 µg/m³, 2.3× usualJenison, 31 July: 67.1 µg/m³, 7.2× usualJenison, 1 August: 28.5 µg/m³, 3.1× usualJenison, 2 August: 38.6 µg/m³, 4.2× usualJenison, 3 August: 47.3 µg/m³, 5.1× usualJenison, 4 August: 33.0 µg/m³, 3.5× usualJenison, 5 August: 38.9 µg/m³, 4.2× usualJenison, 6 August: 25.3 µg/m³, 2.7× usualJenison, 7 August: 11.3 µg/m³, 1.2× usualJenison, 8 August: 10.6 µg/m³, 1.1× usualJenison, 9 August: 10.8 µg/m³, 1.2× usualJenison, 10 August: 7.0 µg/m³, 0.8× usualJenison, 11 August: 7.5 µg/m³, 0.8× usualJenison, 12 August: 5.2 µg/m³, 0.6× usualCedar RapidsCedar Rapids, 27 July: 5.4 µg/m³, 0.6× usualCedar Rapids, 28 July: 4.7 µg/m³, 0.5× usualCedar Rapids, 29 July: 6.8 µg/m³, 0.8× usualCedar Rapids, 30 July: 6.2 µg/m³, 0.7× usualCedar Rapids, 31 July: 66.5 µg/m³, 7.7× usualCedar Rapids, 1 August: 42.5 µg/m³, 4.9× usualCedar Rapids, 2 August: 36.0 µg/m³, 4.2× usualCedar Rapids, 3 August: 24.8 µg/m³, 2.9× usualCedar Rapids, 4 August: 19.2 µg/m³, 2.2× usualCedar Rapids, 5 August: 14.2 µg/m³, 1.7× usualCedar Rapids, 6 August: 15.4 µg/m³, 1.8× usualCedar Rapids, 7 August: 8.9 µg/m³, 1.0× usualCedar Rapids, 8 August: 10.2 µg/m³, 1.2× usualCedar Rapids, 9 August: 10.2 µg/m³, 1.2× usualCedar Rapids, 10 August: 6.1 µg/m³, 0.7× usualCedar Rapids, 11 August: 4.8 µg/m³, 0.6× usualCedar Rapids, 12 August: 7.2 µg/m³, 0.8× usualBrookfieldBrookfield, 27 July: 6.2 µg/m³, 0.7× usualBrookfield, 28 July: 6.8 µg/m³, 0.7× usualBrookfield, 29 July: 11.1 µg/m³, 1.2× usualBrookfield, 30 July: 11.1 µg/m³, 1.2× usualBrookfield, 31 July: 66.3 µg/m³, 7.3× usualBrookfield, 1 August: 51.0 µg/m³, 5.6× usualBrookfield, 2 August: 27.8 µg/m³, 3.1× usualBrookfield, 3 August: 33.8 µg/m³, 3.7× usualBrookfield, 4 August: 25.2 µg/m³, 2.8× usualBrookfield, 5 August: 28.0 µg/m³, 3.1× usualBrookfield, 6 August: 32.7 µg/m³, 3.6× usualBrookfield, 7 August: 13.9 µg/m³, 1.5× usualBrookfield, 8 August: 13.6 µg/m³, 1.5× usualBrookfield, 9 August: 10.5 µg/m³, 1.2× usualBrookfield, 10 August: 7.5 µg/m³, 0.8× usualBrookfield, 11 August: 7.9 µg/m³, 0.9× usualBrookfield, 12 August: 7.7 µg/m³, 0.8× usualIowa CityIowa City, 27 July: 4.1 µg/m³, 0.5× usualIowa City, 28 July: 4.7 µg/m³, 0.5× usualIowa City, 29 July: 5.0 µg/m³, 0.5× usualIowa City, 30 July: 4.2 µg/m³, 0.5× usualIowa City, 31 July: 64.9 µg/m³, 7.1× usualIowa City, 1 August: 48.1 µg/m³, 5.3× usualIowa City, 2 August: 36.4 µg/m³, 4.0× usualIowa City, 3 August: 23.6 µg/m³, 2.6× usualIowa City, 4 August: 19.7 µg/m³, 2.2× usualIowa City, 5 August: 14.3 µg/m³, 1.6× usualIowa City, 6 August: 14.4 µg/m³, 1.6× usualIowa City, 7 August: 8.6 µg/m³, 0.9× usualIowa City, 8 August: 9.5 µg/m³, 1.0× usualIowa City, 9 August: 9.6 µg/m³, 1.1× usualIowa City, 10 August: 6.9 µg/m³, 0.8× usualIowa City, 11 August: 5.3 µg/m³, 0.6× usualIowa City, 12 August: 4.9 µg/m³, 0.5× usualDoltonDolton, 27 July: 7.6 µg/m³, 0.7× usualDolton, 28 July: 9.7 µg/m³, 0.9× usualDolton, 29 July: 11.0 µg/m³, 1.0× usualDolton, 30 July: 13.4 µg/m³, 1.3× usualDolton, 31 July: 64.8 µg/m³, 6.2× usualDolton, 1 August: 48.0 µg/m³, 4.6× usualDolton, 2 August: 25.3 µg/m³, 2.4× usualDolton, 3 August: 28.9 µg/m³, 2.8× usualDolton, 4 August: 18.2 µg/m³, 1.7× usualDolton, 5 August: 32.7 µg/m³, 3.1× usualDolton, 6 August: 32.3 µg/m³, 3.1× usualDolton, 7 August: 15.8 µg/m³, 1.5× usualDolton, 8 August: 15.1 µg/m³, 1.4× usualDolton, 9 August: 13.0 µg/m³, 1.2× usualDolton, 10 August: 10.5 µg/m³, 1.0× usualDolton, 11 August: 10.2 µg/m³, 1.0× usualDolton, 12 August: 9.4 µg/m³, 0.9× usualDavenportDavenport, 27 July: 4.6 µg/m³, 0.5× usualDavenport, 28 July: 4.2 µg/m³, 0.5× usualDavenport, 29 July: 5.1 µg/m³, 0.6× usualDavenport, 30 July: 4.8 µg/m³, 0.6× usualDavenport, 31 July: 64.4 µg/m³, 7.5× usualDavenport, 1 August: 50.7 µg/m³, 5.9× usualDavenport, 2 August: 28.5 µg/m³, 3.3× usualDavenport, 3 August: 30.1 µg/m³, 3.5× usualDavenport, 4 August: 19.6 µg/m³, 2.3× usualDavenport, 5 August: 16.1 µg/m³, 1.9× usualDavenport, 6 August: 14.8 µg/m³, 1.7× usualDavenport, 7 August: 9.2 µg/m³, 1.1× usualDavenport, 8 August: 9.1 µg/m³, 1.1× usualDavenport, 9 August: 8.5 µg/m³, 1.0× usualDavenport, 10 August: 6.0 µg/m³, 0.7× usualDavenport, 11 August: 6.3 µg/m³, 0.7× usualDavenport, 12 August: 4.7 µg/m³, 0.5× usualAuroraAurora, 27 July: 6.3 µg/m³, 0.7× usualAurora, 28 July: 7.4 µg/m³, 0.8× usualAurora, 29 July: 7.5 µg/m³, 0.8× usualAurora, 30 July: 9.7 µg/m³, 1.1× usualAurora, 31 July: 63.4 µg/m³, 7.0× usualAurora, 1 August: 48.2 µg/m³, 5.3× usualAurora, 2 August: 29.0 µg/m³, 3.2× usualAurora, 3 August: 31.5 µg/m³, 3.5× usualAurora, 4 August: 24.4 µg/m³, 2.7× usualAurora, 5 August: 23.1 µg/m³, 2.5× usualAurora, 6 August: 26.7 µg/m³, 2.9× usualAurora, 7 August: 12.6 µg/m³, 1.4× usualAurora, 8 August: 12.1 µg/m³, 1.3× usualAurora, 9 August: 11.3 µg/m³, 1.2× usualAurora, 10 August: 9.1 µg/m³, 1.0× usualAurora, 11 August: 6.6 µg/m³, 0.7× usualAurora, 12 August: 6.4 µg/m³, 0.7× usualLondonLondon, 27 July: 5.9 µg/m³, 0.7× usualLondon, 28 July: 9.9 µg/m³, 1.1× usualLondon, 29 July: 8.8 µg/m³, 1.0× usualLondon, 30 July: 18.8 µg/m³, 2.1× usualLondon, 31 July: 44.9 µg/m³, 5.1× usualLondon, 1 August: 19.6 µg/m³, 2.2× usualLondon, 2 August: 11.5 µg/m³, 1.3× usualLondon, 3 August: 45.8 µg/m³, 5.2× usualLondon, 4 August: 63.1 µg/m³, 7.2× usualLondon, 5 August: 33.4 µg/m³, 3.8× usualLondon, 6 August: 37.8 µg/m³, 4.3× usualLondon, 7 August: 21.5 µg/m³, 2.4× usualLondon, 8 August: 19.7 µg/m³, 2.2× usualLondon, 9 August: 14.5 µg/m³, 1.6× usualLondon, 10 August: 16.7 µg/m³, 1.9× usualLondon, 11 August: 14.7 µg/m³, 1.7× usualLondon, 12 August: 10.2 µg/m³, 1.2× usualNapervilleNaperville, 27 July: 8.0 µg/m³, 0.7× usualNaperville, 28 July: 8.7 µg/m³, 0.8× usualNaperville, 29 July: 8.6 µg/m³, 0.8× usualNaperville, 30 July: 11.2 µg/m³, 1.0× usualNaperville, 31 July: 63.0 µg/m³, 5.8× usualNaperville, 1 August: 49.4 µg/m³, 4.5× usualNaperville, 2 August: 28.5 µg/m³, 2.6× usualNaperville, 3 August: 31.5 µg/m³, 2.9× usualNaperville, 4 August: 24.6 µg/m³, 2.3× usualNaperville, 5 August: 24.9 µg/m³, 2.3× usualNaperville, 6 August: 26.9 µg/m³, 2.5× usualNaperville, 7 August: 13.3 µg/m³, 1.2× usualNaperville, 8 August: 13.3 µg/m³, 1.2× usualNaperville, 9 August: 12.1 µg/m³, 1.1× usualNaperville, 10 August: 9.7 µg/m³, 0.9× usualNaperville, 11 August: 7.5 µg/m³, 0.7× usualNaperville, 12 August: 7.2 µg/m³, 0.7× usualSarniaSarnia, 27 July: 7.4 µg/m³, 0.9× usualSarnia, 28 July: 9.0 µg/m³, 1.1× usualSarnia, 29 July: 8.9 µg/m³, 1.1× usualSarnia, 30 July: 24.0 µg/m³, 2.9× usualSarnia, 31 July: 50.9 µg/m³, 6.1× usualSarnia, 1 August: 9.5 µg/m³, 1.1× usualSarnia, 2 August: 12.2 µg/m³, 1.5× usualSarnia, 3 August: 45.7 µg/m³, 5.4× usualSarnia, 4 August: 62.5 µg/m³, 7.4× usualSarnia, 5 August: 37.5 µg/m³, 4.5× usualSarnia, 6 August: 36.2 µg/m³, 4.3× usualSarnia, 7 August: 20.0 µg/m³, 2.4× usualSarnia, 8 August: 16.0 µg/m³, 1.9× usualSarnia, 9 August: 12.2 µg/m³, 1.5× usualSarnia, 10 August: 15.1 µg/m³, 1.8× usualSarnia, 11 August: 13.3 µg/m³, 1.6× usualSarnia, 12 August: 7.7 µg/m³, 0.9× usualKalamazooKalamazoo, 27 July: 5.9 µg/m³, 0.5× usualKalamazoo, 28 July: 7.4 µg/m³, 0.7× usualKalamazoo, 29 July: 8.2 µg/m³, 0.8× usualKalamazoo, 30 July: 16.9 µg/m³, 1.6× usualKalamazoo, 31 July: 61.6 µg/m³, 5.7× usualKalamazoo, 1 August: 28.1 µg/m³, 2.6× usualKalamazoo, 2 August: 28.6 µg/m³, 2.6× usualKalamazoo, 3 August: 41.0 µg/m³, 3.8× usualKalamazoo, 4 August: 31.6 µg/m³, 2.9× usualKalamazoo, 5 August: 41.9 µg/m³, 3.8× usualKalamazoo, 6 August: 25.7 µg/m³, 2.4× usualKalamazoo, 7 August: 11.5 µg/m³, 1.1× usualKalamazoo, 8 August: 11.9 µg/m³, 1.1× usualKalamazoo, 9 August: 11.1 µg/m³, 1.0× usualKalamazoo, 10 August: 10.7 µg/m³, 1.0× usualKalamazoo, 11 August: 9.1 µg/m³, 0.8× usualKalamazoo, 12 August: 7.7 µg/m³, 0.7× usualPeoriaPeoria, 27 July: 9.0 µg/m³, 0.9× usualPeoria, 28 July: 6.5 µg/m³, 0.6× usualPeoria, 29 July: 8.9 µg/m³, 0.9× usualPeoria, 30 July: 6.6 µg/m³, 0.6× usualPeoria, 31 July: 57.1 µg/m³, 5.5× usualPeoria, 1 August: 61.5 µg/m³, 5.9× usualPeoria, 2 August: 27.2 µg/m³, 2.6× usualPeoria, 3 August: 16.7 µg/m³, 1.6× usualPeoria, 4 August: 12.0 µg/m³, 1.2× usualPeoria, 5 August: 13.5 µg/m³, 1.3× usualPeoria, 6 August: 13.2 µg/m³, 1.3× usualPeoria, 7 August: 12.7 µg/m³, 1.2× usualPeoria, 8 August: 13.4 µg/m³, 1.3× usualPeoria, 9 August: 13.6 µg/m³, 1.3× usualPeoria, 10 August: 9.9 µg/m³, 1.0× usualPeoria, 11 August: 12.3 µg/m³, 1.2× usualPeoria, 12 August: 10.0 µg/m³, 1.0× usualNorthbrookNorthbrook, 27 July: 5.3 µg/m³, 0.5× usualNorthbrook, 28 July: 7.8 µg/m³, 0.8× usualNorthbrook, 29 July: 8.4 µg/m³, 0.8× usualNorthbrook, 30 July: 12.4 µg/m³, 1.3× usualNorthbrook, 31 July: 60.7 µg/m³, 6.1× usualNorthbrook, 1 August: 37.6 µg/m³, 3.8× usualNorthbrook, 2 August: no readingNorthbrook, 3 August: no readingNorthbrook, 4 August: no readingNorthbrook, 5 August: no readingNorthbrook, 6 August: 26.6 µg/m³, 2.7× usualNorthbrook, 7 August: 15.3 µg/m³, 1.5× usualNorthbrook, 8 August: 13.2 µg/m³, 1.3× usualNorthbrook, 9 August: 12.3 µg/m³, 1.2× usualNorthbrook, 10 August: 7.5 µg/m³, 0.8× usualNorthbrook, 11 August: 7.8 µg/m³, 0.8× usualNorthbrook, 12 August: 6.8 µg/m³, 0.7× usualHammondHammond, 27 July: 8.0 µg/m³, 0.8× usualHammond, 28 July: 10.0 µg/m³, 1.0× usualHammond, 29 July: 9.8 µg/m³, 1.0× usualHammond, 30 July: 14.2 µg/m³, 1.4× usualHammond, 31 July: 60.4 µg/m³, 6.1× usualHammond, 1 August: 48.5 µg/m³, 4.9× usualHammond, 2 August: 26.4 µg/m³, 2.7× usualHammond, 3 August: 28.6 µg/m³, 2.9× usualHammond, 4 August: 16.9 µg/m³, 1.7× usualHammond, 5 August: 30.8 µg/m³, 3.1× usualHammond, 6 August: 30.2 µg/m³, 3.1× usualHammond, 7 August: 13.8 µg/m³, 1.4× usualHammond, 8 August: 14.3 µg/m³, 1.4× usualHammond, 9 August: 12.6 µg/m³, 1.3× usualHammond, 10 August: 10.2 µg/m³, 1.0× usualHammond, 11 August: 8.2 µg/m³, 0.8× usualHammond, 12 August: 7.8 µg/m³, 0.8× usualJolietJoliet, 27 July: 7.0 µg/m³, 0.7× usualJoliet, 28 July: 6.5 µg/m³, 0.6× usualJoliet, 29 July: 8.9 µg/m³, 0.8× usualJoliet, 30 July: 11.0 µg/m³, 1.0× usualJoliet, 31 July: 60.4 µg/m³, 5.8× usualJoliet, 1 August: 51.4 µg/m³, 4.9× usualJoliet, 2 August: 25.0 µg/m³, 2.4× usualJoliet, 3 August: 26.2 µg/m³, 2.5× usualJoliet, 4 August: 17.4 µg/m³, 1.7× usualJoliet, 5 August: 25.4 µg/m³, 2.4× usualJoliet, 6 August: 24.5 µg/m³, 2.3× usualJoliet, 7 August: 12.2 µg/m³, 1.2× usualJoliet, 8 August: 13.3 µg/m³, 1.3× usualJoliet, 9 August: 11.7 µg/m³, 1.1× usualJoliet, 10 August: 9.1 µg/m³, 0.9× usualJoliet, 11 August: 9.4 µg/m³, 0.9× usualJoliet, 12 August: 7.4 µg/m³, 0.7× usualKitchenerKitchener, 27 July: 8.8 µg/m³, 1.0× usualKitchener, 28 July: 11.0 µg/m³, 1.2× usualKitchener, 29 July: 7.9 µg/m³, 0.9× usualKitchener, 30 July: 20.6 µg/m³, 2.3× usualKitchener, 31 July: 42.7 µg/m³, 4.7× usualKitchener, 1 August: 9.5 µg/m³, 1.1× usualKitchener, 2 August: 16.1 µg/m³, 1.8× usualKitchener, 3 August: 49.0 µg/m³, 5.4× usualKitchener, 4 August: 59.9 µg/m³, 6.7× usualKitchener, 5 August: 37.8 µg/m³, 4.2× usualKitchener, 6 August: 29.2 µg/m³, 3.2× usualKitchener, 7 August: 27.6 µg/m³, 3.1× usualKitchener, 8 August: 21.6 µg/m³, 2.4× usualKitchener, 9 August: 14.2 µg/m³, 1.6× usualKitchener, 10 August: 16.8 µg/m³, 1.9× usualKitchener, 11 August: 14.6 µg/m³, 1.6× usualKitchener, 12 August: 10.4 µg/m³, 1.2× usualOlatheOlathe, 27 July: 9.1 µg/m³, 0.9× usualOlathe, 28 July: 9.2 µg/m³, 0.9× usualOlathe, 29 July: 8.6 µg/m³, 0.9× usualOlathe, 30 July: 4.8 µg/m³, 0.5× usualOlathe, 31 July: 12.6 µg/m³, 1.3× usualOlathe, 1 August: 64.0 µg/m³, 6.4× usualOlathe, 2 August: 41.8 µg/m³, 4.2× usualOlathe, 3 August: 20.3 µg/m³, 2.0× usualOlathe, 4 August: 12.2 µg/m³, 1.2× usualOlathe, 5 August: 10.9 µg/m³, 1.1× usualOlathe, 6 August: 14.0 µg/m³, 1.4× usualOlathe, 7 August: 14.3 µg/m³, 1.4× usualOlathe, 8 August: 12.1 µg/m³, 1.2× usualOlathe, 9 August: 11.4 µg/m³, 1.1× usualOlathe, 10 August: 7.5 µg/m³, 0.8× usualOlathe, 11 August: 5.8 µg/m³, 0.6× usualOlathe, 12 August: 6.5 µg/m³, 0.7× usualTopekaTopeka, 27 July: 8.2 µg/m³, 0.9× usualTopeka, 28 July: 8.3 µg/m³, 0.9× usualTopeka, 29 July: 8.2 µg/m³, 0.9× usualTopeka, 30 July: 4.1 µg/m³, 0.4× usualTopeka, 31 July: 8.9 µg/m³, 0.9× usualTopeka, 1 August: 62.0 µg/m³, 6.5× usualTopeka, 2 August: 41.5 µg/m³, 4.3× usualTopeka, 3 August: 23.0 µg/m³, 2.4× usualTopeka, 4 August: 13.8 µg/m³, 1.4× usualTopeka, 5 August: 11.2 µg/m³, 1.2× usualTopeka, 6 August: 13.7 µg/m³, 1.4× usualTopeka, 7 August: 12.9 µg/m³, 1.3× usualTopeka, 8 August: 9.6 µg/m³, 1.0× usualTopeka, 9 August: 8.8 µg/m³, 0.9× usualTopeka, 10 August: 6.7 µg/m³, 0.7× usualTopeka, 11 August: 5.0 µg/m³, 0.5× usualTopeka, 12 August: 5.6 µg/m³, 0.6× usualWinnipegWinnipeg, 27 July: no readingWinnipeg, 28 July: no readingWinnipeg, 29 July: no readingWinnipeg, 30 July: no readingWinnipeg, 31 July: no readingWinnipeg, 1 August: no readingWinnipeg, 2 August: 54.3 µg/m³, 5.7× usualWinnipeg, 3 August: 46.8 µg/m³, 4.9× usualWinnipeg, 4 August: 36.9 µg/m³, 3.8× usualWinnipeg, 5 August: 35.0 µg/m³, 3.6× usualWinnipeg, 6 August: 16.7 µg/m³, 1.7× usualWinnipeg, 7 August: 97.7 µg/m³, 10× usualWinnipeg, 8 August: 91.0 µg/m³, 9.5× usualWinnipeg, 9 August: 10.2 µg/m³, 1.1× usualWinnipeg, 10 August: 6.8 µg/m³, 0.7× usualWinnipeg, 11 August: 73.6 µg/m³, 7.7× usualWinnipeg, 12 August: 26.5 µg/m³, 2.8× usual27 Jul29311 Aug24681012
The 60 cities with the highest readings of 241, 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
MarquetteMichigan, United States8 112.030 July8.114×
Rouyn-NorandaQuebec, Canada3 87.32 August7.512×
MadisonWisconsin, United States8 82.431 July8.010×
South MilwaukeeWisconsin, United States7 82.931 July8.110×
ZionIllinois, United States6 77.531 July7.610×
WinnipegManitoba, Canada2 97.77 August9.610×
SuperiorWisconsin, United States6 108.030 July10.810×
AppletonWisconsin, United States8 86.931 July8.710.0×
Eau ClaireWisconsin, United States6 86.831 July8.99.8×
WaukeshaWisconsin, United States8 86.031 July8.99.7×
MilwaukeeWisconsin, United States8 91.131 July9.79.4×
Sault Ste. MarieOntario, Canada9 71.630 July7.79.3×
Green BayWisconsin, United States8 85.930 July9.49.1×
BlaineMinnesota, United States6 79.31 August8.79.1×
DuluthMinnesota, United States6 91.130 July10.09.1×
MankatoMinnesota, United States6 96.931 July10.79.1×
MolineIllinois, United States4 76.031 July8.88.6×
RockfordIllinois, United States7 79.831 July9.68.3×
Des PlainesIllinois, United States7 75.831 July9.28.2×
La VistaNebraska, United States2 48.51 August5.98.2×
CaryIllinois, United States7 75.031 July9.38.1×
ClintonIowa, United States4 73.931 July9.28.0×
MinneapolisMinnesota, United States6 80.71 August10.27.9×
Greater SudburyOntario, Canada4 63.130 July8.07.9×
Apple ValleyMinnesota, United States5 66.11 August8.47.9×
BellevueNebraska, United States2 49.51 August6.37.9×
EastpointeMichigan, United States4 51.74 August6.67.8×
Fort DodgeIowa, United States4 74.831 July9.67.8×
Cedar RapidsIowa, United States3 66.531 July8.67.7×
AllistonOntario, Canada7 53.83 August7.07.7×
North BayOntario, Canada4 53.030 July6.97.7×
Sioux FallsSouth Dakota, United States3 45.11 August5.97.6×
Saint MichaelMinnesota, United States6 69.31 August9.17.6×
OconomowocWisconsin, United States8 111.031 July14.67.6×
ChicagoIllinois, United States6 69.731 July9.27.6×
EriePennsylvania, United States5 53.34 August7.17.5×
DavenportIowa, United States4 64.431 July8.67.5×
MuscatineIowa, United States3 50.131 July6.77.5×
SarniaOntario, Canada5 62.54 August8.47.4×
BurnsvilleMinnesota, United States6 75.11 August10.17.4×
RochesterMinnesota, United States6 76.231 July10.37.4×
PeterboroughOntario, Canada6 52.53 August7.17.4×
BellevilleOntario, Canada5 51.14 August7.07.3×
BrookfieldIllinois, United States7 66.331 July9.17.3×
Saint PaulMinnesota, United States5 73.01 August10.17.2×
JenisonMichigan, United States7 67.131 July9.37.2×
AberdeenSouth Dakota, United States4 41.11 August5.77.2×
ShakopeeMinnesota, United States6 68.931 July9.67.2×
ChathamOntario, Canada3 53.14 August7.47.2×
LondonOntario, Canada5 63.14 August8.87.2×
Iowa CityIowa, United States3 64.931 July9.17.1×
Grand RapidsMichigan, United States5 73.231 July10.37.1×
New CityNew York, United States1 35.55 August4.97.1×
NewburghNew York, United States2 35.45 August5.07.1×
UticaNew York, United States4 35.47 August4.97.1×
Elmwood ParkIllinois, United States7 72.031 July10.27.1×
Saint CloudMinnesota, United States5 63.71 August9.17.0×
AuroraIllinois, United States5 63.431 July9.17.0×
West FargoNorth Dakota, United States5 67.231 July9.76.9×
NewmarketOntario, Canada8 60.23 August8.76.9×
PittsfieldMassachusetts, United States3 44.75 August6.56.9×
Port HuronMichigan, United States5 58.84 August8.66.8×
SaguenayQuebec, Canada2 53.73 August7.96.8×
St. ThomasOntario, Canada5 55.64 August8.26.8×
SyracuseNew York, United States7 45.44 August6.76.8×
BloomingtonIllinois, United States2 57.51 August8.56.8×
BrantfordOntario, Canada6 59.54 August8.86.8×
Franklin ParkIllinois, United States7 76.931 July11.46.7×
KingstonOntario, Canada4 47.24 August7.06.7×
KitchenerOntario, Canada6 59.94 August9.06.7×
BrookingsSouth Dakota, United States5 45.71 August6.96.6×
GreenfieldMassachusetts, United States2 40.45 August6.16.6×
BramptonOntario, Canada6 54.73 August8.36.6×
LibertyMissouri, United States2 44.61 August6.86.6×
AlbanyNew York, United States5 49.85 August7.66.6×
GuelphOntario, Canada5 57.54 August8.86.5×
East ChicagoIndiana, United States4 59.431 July9.16.5×
OmahaNebraska, United States3 50.91 August7.86.5×
SouthfieldMichigan, United States5 56.14 August8.66.5×
BarrieOntario, Canada8 57.93 August8.96.5×
TopekaKansas, United States2 62.01 August9.66.5×
North ChicopeeMassachusetts, United States2 39.35 August6.16.4×
OlatheKansas, United States2 64.01 August10.06.4×
MississaugaOntario, Canada5 51.73 August8.16.4×
BangorMaine, United States1 35.14 August5.56.4×
SpringfieldMassachusetts, United States2 45.25 August7.16.4×
ColumbiaMissouri, United States3 72.51 August11.46.4×
BuffaloNew York, United States7 50.24 August7.96.4×
RaymoreMissouri, United States2 45.01 August7.16.3×
RochesterNew York, United States7 46.04 August7.36.3×
ElginIllinois, United States7 73.731 July11.76.3×
TorontoOntario, Canada7 57.93 August9.26.3×
DorvalQuebec, Canada4 44.24 August7.16.2×
HamiltonOntario, Canada6 55.44 August8.96.2×
White PlainsNew York, United States1 31.05 August4.76.2×
DoltonIllinois, United States6 64.831 July10.56.2×
OakvilleOntario, Canada5 55.83 August9.16.1×
NorthbrookIllinois, United States3 60.731 July9.96.1×
KeeneNew Hampshire, United States2 39.25 August6.46.1×
Michigan CityIndiana, United States5 56.931 July9.36.1×
OttawaOntario, Canada5 45.23 August7.46.1×
MiltonOntario, Canada6 58.63 August9.66.1×
Kansas CityKansas, United States2 58.61 August9.66.1×
EdmundstonNew Brunswick, Canada2 41.53 August6.86.1×
HammondIndiana, United States6 60.431 July9.96.1×
Oak LawnIllinois, United States5 56.731 July9.36.1×
LansingMichigan, United States5 59.731 July9.86.1×
WaterdownOntario, Canada5 51.14 August8.46.1×
MilfordMassachusetts, United States2 34.75 August5.86.0×
PeoriaIllinois, United States3 61.51 August10.45.9×
Bay CityMichigan, United States6 51.44 August8.75.9×
WindsorOntario, Canada6 61.94 August10.65.8×
SherbrookeQuebec, Canada2 39.03 August6.75.8×
BridgeviewIllinois, United States6 68.031 July11.75.8×
LaconiaNew Hampshire, United States2 29.04 August4.55.8×
HartfordConnecticut, United States2 45.15 August7.85.8×
NapervilleIllinois, United States5 63.031 July10.95.8×
Saint-Jean-sur-RichelieuQuebec, Canada3 35.13 August6.15.8×
JolietIllinois, United States5 60.431 July10.55.8×
Des MoinesIowa, United States3 48.331 July8.45.7×
CornwallOntario, Canada4 41.44 August7.35.7×
SpringfieldIllinois, United States2 53.31 August9.45.7×
YpsilantiMichigan, United States3 49.231 July8.75.7×
KalamazooMichigan, United States7 61.631 July10.95.7×
HollandMichigan, United States6 55.331 July9.85.6×
Kansas CityMissouri, United States2 47.01 August8.45.6×
FrederictonNew Brunswick, Canada1 30.24 August5.45.6×
PainesvilleOhio, United States2 36.24 August6.55.6×
GranbyQuebec, Canada4 44.33 August8.05.5×
ChampaignIllinois, United States2 49.61 August9.05.5×
DecaturIllinois, United States2 52.31 August9.55.5×
MonctonNew Brunswick, Canada1 28.64 August5.35.4×
DetroitMichigan, United States5 56.14 August10.45.4×
St. CatharinesOntario, Canada7 41.54 August7.75.4×
Calumet CityIllinois, United States5 56.031 July10.45.4×
DanburyConnecticut, United States2 40.25 August7.55.4×
TaylorMichigan, United States4 48.04 August9.05.3×
Grand IslandNebraska, United States2 42.51 August8.05.3×
LewistonMaine, United States1 32.24 August6.15.3×
DrummondvilleQuebec, Canada3 36.43 August6.95.3×
LeawoodKansas, United States2 44.11 August8.45.3×
WorcesterMassachusetts, United States2 34.05 August6.55.2×
Lincoln ParkMichigan, United States3 49.84 August9.65.2×
Trois-RivièresQuebec, Canada3 36.03 August7.05.1×
WaterburyConnecticut, United States2 38.55 August7.55.1×
MontréalQuebec, Canada4 38.33 August7.55.1×
RutlandVermont, United States3 34.74 August6.85.1×
RedfordMichigan, United States4 46.44 August9.15.1×
ScrantonPennsylvania, United States4 41.25 August8.15.1×
AnkenyIowa, United States3 48.331 July9.55.1×
QuébecQuebec, Canada3 41.627 July8.25.1×
Upper AltonIllinois, United States1 50.21 August9.95.1×
ElkhartIndiana, United States5 46.131 July9.15.1×
DearbornMichigan, United States5 53.64 August10.65.1×
Rivière-des-Prairies–Pointe-aux-TremblesQuebec, Canada4 36.33 August7.25.0×
FraminghamMassachusetts, United States2 26.85 August5.45.0×
HaverhillMassachusetts, United States1 29.74 August6.05.0×
DerryNew Hampshire, United States2 32.04 August6.54.9×
WatertownSouth Dakota, United States4 45.21 August9.34.9×
Saint JosephMissouri, United States2 48.61 August10.04.9×
South BendIndiana, United States3 44.731 July9.24.9×
L'Ancienne-LoretteQuebec, Canada2 45.027 July9.34.8×
WaterlooIowa, United States2 41.61 August8.64.8×
BrossardQuebec, Canada4 37.73 August7.84.8×
MiramichiNew Brunswick, Canada2 26.028 July5.54.7×
GaryIndiana, United States4 45.931 July9.84.7×
ShawiniganQuebec, Canada3 37.827 July8.14.7×
University CityMissouri, United States1 36.21 August7.84.6×
Cleveland HeightsOhio, United States2 34.34 August7.44.6×
State CollegePennsylvania, United States2 33.66 August7.34.6×
SewellNew Jersey, United States1 34.927 July7.64.6×
AugustaMaine, United States2 31.24 August6.84.6×
LexingtonMassachusetts, United States3 41.027 July9.04.6×
PortageIndiana, United States5 46.131 July10.24.5×
East Saint LouisIllinois, United States1 46.01 August10.34.5×
ArnoldMissouri, United States1 35.11 August7.94.4×
New HavenConnecticut, United States1 33.75 August7.64.4×
WyomingMichigan, United States5 54.731 July12.44.4×
RandolphNew Jersey, United States1 32.55 August7.44.4×
Sorel-TracyQuebec, Canada5 39.93 August9.14.4×
Fort LeeNew Jersey, United States1 31.45 August7.24.4×
Granite CityIllinois, United States1 47.61 August11.04.3×
PortsmouthNew Hampshire, United States1 28.54 August6.64.3×
ChesapeakeVirginia, United States1 34.97 August8.14.3×
Dodge CityKansas, United States1 30.72 August7.24.3×
CarlislePennsylvania, United States3 32.76 August7.74.2×
LowellMassachusetts, United States2 27.527 July6.54.2×
ToledoOhio, United States4 38.44 August9.14.2×
MuncieIndiana, United States1 34.61 August8.64.0×
LafayetteIndiana, United States1 31.81 August8.04.0×
BridgeportConnecticut, United States1 31.35 August7.94.0×
LynnMassachusetts, United States1 25.74 August6.54.0×
PortlandMaine, United States1 31.54 August8.03.9×
New York CityNew York, United States1 32.85 August8.43.9×
NorristownPennsylvania, United States1 27.95 August7.23.9×
Fort WayneIndiana, United States3 35.91 August9.33.9×
East HamptonVirginia, United States1 28.97 August7.53.9×
PatersonNew Jersey, United States1 30.427 July7.93.8×
St. LouisMissouri, United States1 37.71 August9.83.8×
LebanonPennsylvania, United States2 32.36 August8.43.8×
DerbyKansas, United States2 36.91 August9.63.8×
BostonMassachusetts, United States1 26.84 August7.03.8×
Shaker HeightsOhio, United States1 31.44 August8.33.8×
AndersonIndiana, United States1 30.41 August8.23.7×
NepeanOntario, Canada7 57.630 July15.63.7×
LincolnNebraska, United States1 27.32 August7.43.7×
KokomoIndiana, United States1 30.51 August8.33.7×
HickoryNorth Carolina, United States1 28.48 August7.83.6×
New BrunswickNew Jersey, United States1 27.627 July7.63.6×
LexingtonNorth Carolina, United States1 29.88 August8.33.6×
PennsaukenNew Jersey, United States1 30.427 July8.63.5×
YorkPennsylvania, United States1 29.26 August8.33.5×
HopewellVirginia, United States1 25.37 August7.23.5×
AbingtonPennsylvania, United States1 25.75 August7.43.5×
ClemmonsNorth Carolina, United States1 27.48 August7.93.5×
RoanokeVirginia, United States1 25.38 August7.33.5×
SteubenvilleOhio, United States2 31.08 August9.13.4×
Ponca CityOklahoma, United States2 34.42 August10.13.4×
WilmingtonDelaware, United States1 26.05 August7.73.4×
BloomingtonIndiana, United States1 26.61 August7.93.4×
Jersey CityNew Jersey, United States1 27.45 August8.23.3×
ClevelandOhio, United States3 34.54 August10.43.3×
LindenNew Jersey, United States1 27.827 July8.43.3×
Winston-SalemNorth Carolina, United States1 28.08 August8.53.3×
HarrisburgPennsylvania, United States2 30.56 August9.33.3×
LancasterPennsylvania, United States2 28.66 August8.83.3×
YoungstownOhio, United States2 26.88 August8.33.2×
IndianapolisIndiana, United States1 33.11 August10.73.1×
PittsburghPennsylvania, United States1 27.18 August9.22.9×
CamdenNew Jersey, United States1 27.35 August9.32.9×
Ann ArborMichigan, United States3 38.931 July13.42.9×
ElizabethNew Jersey, United States1 27.85 August9.62.9×
LimaOhio, United States1 26.51 August9.52.8×
PhiladelphiaPennsylvania, United States1 27.55 August10.02.8×
Terre HauteIndiana, United States1 28.01 August10.22.7×
Wake ForestNorth Carolina, United States2 33.08 August12.42.7×
FishersIndiana, United States1 26.51 August10.02.7×
WarrenOhio, United States1 25.66 August9.92.6×
WestervilleOhio, United States1 25.91 August10.42.5×
West MifflinPennsylvania, United States1 26.18 August10.62.5×
MiddletownOhio, United States1 26.01 August11.62.2×

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 4 of 106 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 106.

Use this page

SmogRank, North-eastern United States and Canada, July and August 2025: 241 cities with PM2.5 at twice their usual or more, 30 July to 9 August 2025, smogrank.com/episodes/2025-07-north-eastern-united-states-and-canada-3 (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.