SmogRank / Episodes / United States

Eastern United States and Canada, 14 to 19 June 2023

For 6 days, from 14 to 19 June 2023, 161 cities in the United States and Canada had PM2.5 at least twice their usual for the time of year. The worst reading was Saint Paul, Minnesota, United States: 105.0 µg/m³ on 14 June, about 17× its usual 6.3.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached161in 2 countries
Days614 to 19 June 2023
Worst day17 June98 cities counted
Furthest above usual18×Saint Cloud

Day by day

17 June 98 cities at twice their usual or more
FishersKalamazooColumbusHollandWhite OakOak LawnZionBay CitySpringfieldPainesvilleCharlestonClarksvilleHendersonvilleCookevillePaducahEast Saint LouisSt. LouisUniversity CityLemayArnoldMaryvilleColumbiaSault Ste. MarieAshevilleHamiltonDyersburgJacksonHuntsvilleDecaturHickoryGadsdenBartlettGreater SudburyAtlantaAthensWest MemphisTrussvilleLexingtonCharlotteBirminghamHernandoHueytownMcDonoughHagerstownDes MoinesAnkenyRochesterAugustaDurhamMaconCarlisleMorrisvilleSpringfieldWarner RobinsRockvilleSpringfieldWashingtonScaggsvilleYorkSouth LaurelFayettevilleLibertyHunt ValleyHopewellRaymoreLittle RockBaltimoreKansas CityKansas CityLebanonSaint JosephEdgewoodOlatheSyracuseKingstonReadingSpringdaleElktonNorth CharlestonNewarkBearAllentownWilmingtonChesapeakeBethlehemDoverTopekaBellevueNorristownOmahaFort SmithUticaSouth VinelandEwingTrentonLincolnNew BrunswickPleasantvilleTexarkanaLindenElizabethSioux FallsPatersonTulsaToms RiverJenksBayonneJersey CityNewburghNew CityFort LeeBrookingsMcAlesterWhite PlainsAlbanyHempsteadDerbyDanburyWichitaPonca CityBridgeportPittsfieldHolbrookWaterburyNew HavenAdaGrand IslandBurlingtonRutlandHartfordEdmondNorth ChicopeeSpringfieldGreenfieldOklahoma CityMooreKeeneNew LondonWorcesterDallasDentonCoventryDrummondvilleShawiniganTrois-RivièresProvidencePawtucketLawtonSaginawFort WorthLaconiaLowellDerryFall RiverBostonBrocktonHaverhillQuincyLynnPortsmouthL'Ancienne-LoretteQuébecSaguenayCheektowagaCandler-McAfeeGaryOwensboroChattanoogaEast RidgeHarrisburgGreensboroGranite CityRoanoke RapidsChicagoPennsaukenEvansvilleNew York CityGrand RapidsFranklin ParkTerre HauteLawrencevillePhiladelphiaLimaWest MifflinClemmonsTorontoWinston-SalemSaint AndrewsElkhartGreenvilleLafayetteRaleighDecaturKenmoreClaytonKnoxvilleFlorenceGainesvilleLa CrosseJenisonNorthbrookToledoKokomoEast HamptonKingsportRichmondLancasterLansingBarrieBrantfordBensalemPortageSteubenvilleSpartanburgMiddletownRose HillScrantonHammondCincinnatiNorwoodCharlottesvilleFlintJolietRedfordChesterGreenvilleWarrenAltoonaDes PlainesCaryMcKeesportCalumet CityDaytonSpringfieldPittsburghNew AlbanyLebanonKitchenerYoungstownMilwaukeeWilkinsburgNapervilleIndianapolisLexington-FayetteJohnstownMasonAshlandLondonBuffaloCantonHermitageValley StationState CollegeBrossardPort HuronRoanokeEast ChicagoClevelandBloomingtonSarniaSouth BendDearbornErieSouth MilwaukeeWeirton HeightsSt. CatharinesGranbyDorvalSt. ThomasAndersonRivière-des-Prairies–Pointe-aux-TremblesFort ThomasMedinaDetroitGahannaBloomingtonYpsilantiWaukeshaAkronLincoln ParkWindsorSaint-Jean-sur-RichelieuPeterboroughMontréalRockfordElizabethtownLouisvilleConwayChathamMuscatineShaker HeightsTaylorDublinSaint MatthewsJeffersonvilleJeffersontownCornwallRouyn-NorandaWatertownGreen BayAppletonWaterlooMadisonOttawaIowa CityDavenportRochesterAberdeenClintonMolineBellevilleSuperiorNorth BayEau ClaireDuluthWest FargoApple ValleyShakopeeBlaineBurnsvilleMinneapolisSaint PaulSaint MichaelSaint Cloud
11 Jun1213141516171819202122
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

Saint PaulSaint Paul, 11 June: 6.9 µg/m³Saint Paul, 12 June: 12.7 µg/m³Saint Paul, 13 June: 10.9 µg/m³Saint Paul, 14 June: 105.0 µg/m³, 17× its usual 6.3Saint Paul, 15 June: 36.9 µg/m³, 5.9× its usual 6.3Saint Paul, 16 June: 21.0 µg/m³Saint Paul, 17 June: 23.8 µg/m³Saint Paul, 18 June: 18.3 µg/m³Saint Paul, 19 June: 11.8 µg/m³Saint Paul, 20 June: 21.6 µg/m³Saint Paul, 21 June: 20.9 µg/m³Saint Paul, 22 June: 18.7 µg/m³MinneapolisMinneapolis, 11 June: 6.9 µg/m³Minneapolis, 12 June: 12.6 µg/m³Minneapolis, 13 June: 10.6 µg/m³Minneapolis, 14 June: 105.0 µg/m³, 15× its usual 6.8Minneapolis, 15 June: 41.4 µg/m³, 6.1× its usual 6.8Minneapolis, 16 June: 22.0 µg/m³Minneapolis, 17 June: 26.8 µg/m³, 4.0× its usual 6.7Minneapolis, 18 June: 17.0 µg/m³Minneapolis, 19 June: 10.9 µg/m³Minneapolis, 20 June: 22.3 µg/m³Minneapolis, 21 June: 21.5 µg/m³Minneapolis, 22 June: 19.0 µg/m³Saint MichaelSaint Michael, 11 June: 5.8 µg/m³Saint Michael, 12 June: 10.0 µg/m³Saint Michael, 13 June: 9.5 µg/m³Saint Michael, 14 June: 100.0 µg/m³, 17× its usual 5.8Saint Michael, 15 June: 40.4 µg/m³, 7.0× its usual 5.8Saint Michael, 16 June: 21.0 µg/m³Saint Michael, 17 June: 25.4 µg/m³, 4.4× its usual 5.8Saint Michael, 18 June: 16.7 µg/m³Saint Michael, 19 June: 10.8 µg/m³Saint Michael, 20 June: 19.1 µg/m³Saint Michael, 21 June: 21.8 µg/m³Saint Michael, 22 June: 16.2 µg/m³Saint CloudSaint Cloud, 11 June: 7.7 µg/m³Saint Cloud, 12 June: 9.7 µg/m³Saint Cloud, 13 June: 9.5 µg/m³Saint Cloud, 14 June: 99.5 µg/m³, 18× its usual 5.6Saint Cloud, 15 June: 29.3 µg/m³, 5.2× its usual 5.6Saint Cloud, 16 June: 20.6 µg/m³Saint Cloud, 17 June: 27.7 µg/m³, 4.9× its usual 5.6Saint Cloud, 18 June: 15.5 µg/m³Saint Cloud, 19 June: 14.1 µg/m³Saint Cloud, 20 June: 18.3 µg/m³Saint Cloud, 21 June: 22.9 µg/m³Saint Cloud, 22 June: 15.1 µg/m³BurnsvilleBurnsville, 11 June: 6.7 µg/m³Burnsville, 12 June: 12.6 µg/m³Burnsville, 13 June: 10.7 µg/m³Burnsville, 14 June: 95.5 µg/m³, 15× its usual 6.3Burnsville, 15 June: 54.7 µg/m³, 8.7× its usual 6.3Burnsville, 16 June: 21.6 µg/m³Burnsville, 17 June: 26.4 µg/m³, 4.2× its usual 6.3Burnsville, 18 June: 17.0 µg/m³Burnsville, 19 June: 11.8 µg/m³Burnsville, 20 June: 23.9 µg/m³Burnsville, 21 June: 23.2 µg/m³Burnsville, 22 June: 20.0 µg/m³ShakopeeShakopee, 11 June: 6.8 µg/m³Shakopee, 12 June: 10.7 µg/m³Shakopee, 13 June: 9.7 µg/m³Shakopee, 14 June: 89.0 µg/m³, 15× its usual 6.1Shakopee, 15 June: 55.9 µg/m³, 9.2× its usual 6.1Shakopee, 16 June: 19.8 µg/m³Shakopee, 17 June: 24.8 µg/m³Shakopee, 18 June: 13.3 µg/m³Shakopee, 19 June: 10.0 µg/m³Shakopee, 20 June: 19.8 µg/m³Shakopee, 21 June: 21.8 µg/m³Shakopee, 22 June: 17.7 µg/m³BlaineBlaine, 11 June: 3.8 µg/m³Blaine, 12 June: 7.9 µg/m³Blaine, 13 June: 8.0 µg/m³Blaine, 14 June: 84.8 µg/m³, 15× its usual 5.6Blaine, 15 June: 26.9 µg/m³, 4.8× its usual 5.6Blaine, 16 June: 15.9 µg/m³Blaine, 17 June: 21.5 µg/m³Blaine, 18 June: 14.9 µg/m³Blaine, 19 June: 18.5 µg/m³Blaine, 20 June: 25.2 µg/m³Blaine, 21 June: 15.4 µg/m³Blaine, 22 June: 13.8 µg/m³Apple ValleyApple Valley, 11 June: 6.8 µg/m³Apple Valley, 12 June: 10.8 µg/m³Apple Valley, 13 June: 9.8 µg/m³Apple Valley, 14 June: 84.5 µg/m³, 14× its usual 5.9Apple Valley, 15 June: 54.8 µg/m³, 9.3× its usual 5.9Apple Valley, 16 June: 20.1 µg/m³Apple Valley, 17 June: 23.0 µg/m³Apple Valley, 18 June: 14.4 µg/m³Apple Valley, 19 June: 9.2 µg/m³Apple Valley, 20 June: 21.3 µg/m³Apple Valley, 21 June: 21.4 µg/m³Apple Valley, 22 June: 17.5 µg/m³West FargoWest Fargo, 11 June: 9.0 µg/m³West Fargo, 12 June: 13.6 µg/m³West Fargo, 13 June: 15.8 µg/m³West Fargo, 14 June: 75.4 µg/m³, 12× its usual 6.1West Fargo, 15 June: 24.3 µg/m³West Fargo, 16 June: 21.7 µg/m³West Fargo, 17 June: 24.4 µg/m³West Fargo, 18 June: 22.4 µg/m³West Fargo, 19 June: 13.7 µg/m³West Fargo, 20 June: 12.6 µg/m³West Fargo, 21 June: 15.1 µg/m³West Fargo, 22 June: 9.4 µg/m³DuluthDuluth, 11 June: 5.6 µg/m³Duluth, 12 June: 7.7 µg/m³Duluth, 13 June: 20.2 µg/m³Duluth, 14 June: 62.2 µg/m³, 11× its usual 5.7Duluth, 15 June: 11.2 µg/m³Duluth, 16 June: 8.3 µg/m³Duluth, 17 June: 14.9 µg/m³Duluth, 18 June: 18.6 µg/m³Duluth, 19 June: 29.2 µg/m³Duluth, 20 June: 22.5 µg/m³Duluth, 21 June: 22.5 µg/m³Duluth, 22 June: 21.3 µg/m³SuperiorSuperior, 11 June: 6.0 µg/m³Superior, 12 June: 7.9 µg/m³Superior, 13 June: 18.5 µg/m³Superior, 14 June: 58.9 µg/m³, 8.7× its usual 6.8Superior, 15 June: 10.7 µg/m³Superior, 16 June: 9.2 µg/m³Superior, 17 June: 12.9 µg/m³Superior, 18 June: 15.9 µg/m³Superior, 19 June: 28.0 µg/m³Superior, 20 June: 21.4 µg/m³Superior, 21 June: 22.3 µg/m³Superior, 22 June: 24.4 µg/m³ClintonClinton, 11 June: 9.6 µg/m³Clinton, 12 June: 9.7 µg/m³Clinton, 13 June: 13.5 µg/m³Clinton, 14 June: 25.3 µg/m³, 3.8× its usual 6.7Clinton, 15 June: 56.0 µg/m³, 8.0× its usual 7.0Clinton, 16 June: 17.0 µg/m³Clinton, 17 June: 30.6 µg/m³, 4.3× its usual 7.2Clinton, 18 June: 27.8 µg/m³, 3.8× its usual 7.3Clinton, 19 June: 23.7 µg/m³Clinton, 20 June: 19.4 µg/m³Clinton, 21 June: 18.7 µg/m³Clinton, 22 June: 19.0 µg/m³Eau ClaireEau Claire, 11 June: 5.8 µg/m³Eau Claire, 12 June: 7.1 µg/m³Eau Claire, 13 June: 14.4 µg/m³Eau Claire, 14 June: 55.9 µg/m³, 9.8× its usual 5.7Eau Claire, 15 June: 20.6 µg/m³Eau Claire, 16 June: 19.1 µg/m³Eau Claire, 17 June: 23.6 µg/m³Eau Claire, 18 June: 24.3 µg/m³Eau Claire, 19 June: 22.4 µg/m³Eau Claire, 20 June: 23.0 µg/m³Eau Claire, 21 June: 19.6 µg/m³Eau Claire, 22 June: 19.1 µg/m³RochesterRochester, 11 June: 6.0 µg/m³Rochester, 12 June: 11.0 µg/m³Rochester, 13 June: 13.5 µg/m³Rochester, 14 June: 48.1 µg/m³, 6.9× its usual 7.0Rochester, 15 June: 55.5 µg/m³, 7.9× its usual 7.0Rochester, 16 June: 20.1 µg/m³Rochester, 17 June: 22.7 µg/m³Rochester, 18 June: 21.0 µg/m³Rochester, 19 June: 14.8 µg/m³Rochester, 20 June: 21.8 µg/m³Rochester, 21 June: 18.7 µg/m³Rochester, 22 June: 18.6 µg/m³MadisonMadison, 11 June: 7.0 µg/m³Madison, 12 June: 7.3 µg/m³Madison, 13 June: 12.6 µg/m³Madison, 14 June: 40.3 µg/m³, 6.9× its usual 5.8Madison, 15 June: 33.2 µg/m³, 5.6× its usual 5.9Madison, 16 June: 17.4 µg/m³Madison, 17 June: 32.5 µg/m³, 5.3× its usual 6.1Madison, 18 June: 30.2 µg/m³, 5.0× its usual 6.1Madison, 19 June: 26.9 µg/m³, 4.1× its usual 6.6Madison, 20 June: 22.0 µg/m³Madison, 21 June: 19.3 µg/m³Madison, 22 June: 21.1 µg/m³AppletonAppleton, 11 June: 5.5 µg/m³Appleton, 12 June: 7.1 µg/m³Appleton, 13 June: 17.5 µg/m³Appleton, 14 June: 28.8 µg/m³, 4.8× its usual 6.0Appleton, 15 June: 16.4 µg/m³Appleton, 16 June: 25.6 µg/m³Appleton, 17 June: 40.2 µg/m³, 6.5× its usual 6.2Appleton, 18 June: 34.8 µg/m³, 5.6× its usual 6.2Appleton, 19 June: 28.2 µg/m³, 4.3× its usual 6.5Appleton, 20 June: 23.1 µg/m³Appleton, 21 June: 19.4 µg/m³Appleton, 22 June: 27.7 µg/m³RockfordRockford, 11 June: 6.9 µg/m³Rockford, 12 June: 7.2 µg/m³Rockford, 13 June: 10.5 µg/m³Rockford, 14 June: 33.4 µg/m³, 4.5× its usual 7.4Rockford, 15 June: 36.3 µg/m³, 4.9× its usual 7.4Rockford, 16 June: 17.0 µg/m³Rockford, 17 June: 30.1 µg/m³, 4.0× its usual 7.6Rockford, 18 June: 27.2 µg/m³, 3.5× its usual 7.8Rockford, 19 June: 24.9 µg/m³Rockford, 20 June: 20.2 µg/m³Rockford, 21 June: 19.0 µg/m³Rockford, 22 June: 20.6 µg/m³La CrosseLa Crosse, 11 June: 6.6 µg/m³La Crosse, 12 June: 6.5 µg/m³La Crosse, 13 June: 13.0 µg/m³La Crosse, 14 June: 27.9 µg/m³, 2.3× its usual 12.1La Crosse, 15 June: 35.1 µg/m³, 3.2× its usual 11.1La Crosse, 16 June: 17.1 µg/m³La Crosse, 17 June: 19.4 µg/m³La Crosse, 18 June: 25.2 µg/m³, 2.3× its usual 11.1La Crosse, 19 June: 21.4 µg/m³La Crosse, 20 June: 22.1 µg/m³La Crosse, 21 June: 18.0 µg/m³La Crosse, 22 June: 16.9 µg/m³WaterlooWaterloo, 11 June: 8.5 µg/m³Waterloo, 12 June: 11.3 µg/m³Waterloo, 13 June: 11.7 µg/m³Waterloo, 14 June: 21.0 µg/m³Waterloo, 15 June: 51.3 µg/m³, 6.8× its usual 7.6Waterloo, 16 June: 20.2 µg/m³Waterloo, 17 June: 17.8 µg/m³Waterloo, 18 June: 12.9 µg/m³Waterloo, 19 June: 19.7 µg/m³Waterloo, 20 June: 19.5 µg/m³Waterloo, 21 June: 16.7 µg/m³Waterloo, 22 June: 19.0 µg/m³MolineMoline, 11 June: 11.1 µg/m³Moline, 12 June: 9.8 µg/m³Moline, 13 June: 12.2 µg/m³Moline, 14 June: 23.1 µg/m³Moline, 15 June: 49.9 µg/m³, 8.2× its usual 6.1Moline, 16 June: 17.6 µg/m³Moline, 17 June: 28.7 µg/m³, 4.6× its usual 6.3Moline, 18 June: 22.3 µg/m³Moline, 19 June: 22.7 µg/m³Moline, 20 June: 20.7 µg/m³Moline, 21 June: 19.3 µg/m³Moline, 22 June: 20.2 µg/m³DavenportDavenport, 11 June: 10.3 µg/m³Davenport, 12 June: 9.2 µg/m³Davenport, 13 June: 11.7 µg/m³Davenport, 14 June: 22.2 µg/m³Davenport, 15 June: 49.0 µg/m³, 7.3× its usual 6.7Davenport, 16 June: 16.9 µg/m³Davenport, 17 June: 26.5 µg/m³, 3.8× its usual 6.9Davenport, 18 June: 20.2 µg/m³Davenport, 19 June: 20.8 µg/m³Davenport, 20 June: 19.3 µg/m³Davenport, 21 June: 18.0 µg/m³Davenport, 22 June: 18.8 µg/m³Iowa CityIowa City, 11 June: 11.8 µg/m³Iowa City, 12 June: 9.9 µg/m³Iowa City, 13 June: 11.9 µg/m³Iowa City, 14 June: 18.0 µg/m³Iowa City, 15 June: 46.3 µg/m³, 7.2× its usual 6.4Iowa City, 16 June: 19.1 µg/m³Iowa City, 17 June: 21.9 µg/m³Iowa City, 18 June: 19.5 µg/m³Iowa City, 19 June: 19.0 µg/m³Iowa City, 20 June: 19.5 µg/m³Iowa City, 21 June: 18.3 µg/m³Iowa City, 22 June: 20.4 µg/m³JeffersonvilleJeffersonville, 11 June: 19.1 µg/m³Jeffersonville, 12 June: 12.8 µg/m³Jeffersonville, 13 June: 12.9 µg/m³Jeffersonville, 14 June: 17.2 µg/m³Jeffersonville, 15 June: 43.8 µg/m³, 5.3× its usual 8.2Jeffersonville, 16 June: 27.3 µg/m³, 3.3× its usual 8.2Jeffersonville, 17 June: 33.5 µg/m³, 3.9× its usual 8.5Jeffersonville, 18 June: 35.0 µg/m³, 4.0× its usual 8.7Jeffersonville, 19 June: 12.6 µg/m³Jeffersonville, 20 June: 16.6 µg/m³Jeffersonville, 21 June: 17.4 µg/m³Jeffersonville, 22 June: 6.0 µg/m³AberdeenAberdeen, 11 June: 5.2 µg/m³Aberdeen, 12 June: 6.5 µg/m³Aberdeen, 13 June: 8.9 µg/m³Aberdeen, 14 June: 24.7 µg/m³Aberdeen, 15 June: 39.9 µg/m³, 8.0× its usual 3.7Aberdeen, 16 June: 20.5 µg/m³Aberdeen, 17 June: 15.6 µg/m³Aberdeen, 18 June: 14.8 µg/m³Aberdeen, 19 June: 8.3 µg/m³Aberdeen, 20 June: 6.5 µg/m³Aberdeen, 21 June: 11.3 µg/m³Aberdeen, 22 June: 8.6 µg/m³LouisvilleLouisville, 11 June: 16.2 µg/m³Louisville, 12 June: 12.1 µg/m³Louisville, 13 June: 13.0 µg/m³Louisville, 14 June: 15.1 µg/m³Louisville, 15 June: 39.8 µg/m³, 4.9× its usual 8.1Louisville, 16 June: 24.9 µg/m³Louisville, 17 June: 28.6 µg/m³, 3.4× its usual 8.4Louisville, 18 June: 31.9 µg/m³, 3.7× its usual 8.6Louisville, 19 June: 12.4 µg/m³Louisville, 20 June: 15.0 µg/m³Louisville, 21 June: 16.1 µg/m³Louisville, 22 June: 5.5 µg/m³Saint MatthewsSaint Matthews, 11 June: 14.7 µg/m³Saint Matthews, 12 June: 11.9 µg/m³Saint Matthews, 13 June: 11.3 µg/m³Saint Matthews, 14 June: 14.6 µg/m³Saint Matthews, 15 June: 39.5 µg/m³, 5.3× its usual 7.5Saint Matthews, 16 June: 25.9 µg/m³, 3.4× its usual 7.7Saint Matthews, 17 June: 29.6 µg/m³, 3.7× its usual 7.9Saint Matthews, 18 June: 36.7 µg/m³, 4.6× its usual 8.0Saint Matthews, 19 June: 11.8 µg/m³Saint Matthews, 20 June: 14.4 µg/m³Saint Matthews, 21 June: 15.3 µg/m³Saint Matthews, 22 June: 4.6 µg/m³JeffersontownJeffersontown, 11 June: 15.9 µg/m³Jeffersontown, 12 June: 12.4 µg/m³Jeffersontown, 13 June: 11.6 µg/m³Jeffersontown, 14 June: 15.8 µg/m³Jeffersontown, 15 June: 39.3 µg/m³, 5.5× its usual 7.2Jeffersontown, 16 June: 27.4 µg/m³, 3.6× its usual 7.6Jeffersontown, 17 June: 30.4 µg/m³, 3.9× its usual 7.8Jeffersontown, 18 June: 30.6 µg/m³, 3.8× its usual 8.0Jeffersontown, 19 June: 12.5 µg/m³Jeffersontown, 20 June: 14.7 µg/m³Jeffersontown, 21 June: 16.0 µg/m³Jeffersontown, 22 June: 4.9 µg/m³IndianapolisIndianapolis, 11 June: 21.7 µg/m³Indianapolis, 12 June: 11.0 µg/m³Indianapolis, 13 June: 10.7 µg/m³Indianapolis, 14 June: 15.6 µg/m³Indianapolis, 15 June: 28.3 µg/m³, 3.0× its usual 9.3Indianapolis, 16 June: 20.3 µg/m³Indianapolis, 17 June: 33.7 µg/m³, 3.4× its usual 9.9Indianapolis, 18 June: 38.9 µg/m³, 3.9× its usual 10.0Indianapolis, 19 June: 24.9 µg/m³Indianapolis, 20 June: 15.9 µg/m³Indianapolis, 21 June: 18.6 µg/m³Indianapolis, 22 June: 8.6 µg/m³WatertownWatertown, 11 June: 7.0 µg/m³Watertown, 12 June: 7.8 µg/m³Watertown, 13 June: 11.0 µg/m³Watertown, 14 June: 20.7 µg/m³Watertown, 15 June: 36.6 µg/m³, 6.2× its usual 5.9Watertown, 16 June: 22.3 µg/m³Watertown, 17 June: 16.5 µg/m³Watertown, 18 June: 14.5 µg/m³Watertown, 19 June: 10.6 µg/m³Watertown, 20 June: 13.7 µg/m³Watertown, 21 June: 20.2 µg/m³Watertown, 22 June: 14.5 µg/m³NapervilleNaperville, 11 June: 8.0 µg/m³Naperville, 12 June: 7.2 µg/m³Naperville, 13 June: 11.0 µg/m³Naperville, 14 June: 22.7 µg/m³Naperville, 15 June: 29.2 µg/m³, 3.5× its usual 8.4Naperville, 16 June: 15.7 µg/m³Naperville, 17 June: 34.8 µg/m³, 3.9× its usual 8.9Naperville, 18 June: 30.5 µg/m³, 3.4× its usual 9.0Naperville, 19 June: 27.2 µg/m³, 2.9× its usual 9.3Naperville, 20 June: 21.9 µg/m³Naperville, 21 June: 23.1 µg/m³Naperville, 22 June: 22.9 µg/m³MuscatineMuscatine, 11 June: 10.0 µg/m³Muscatine, 12 June: 6.5 µg/m³Muscatine, 13 June: 8.8 µg/m³Muscatine, 14 June: 14.9 µg/m³Muscatine, 15 June: 34.0 µg/m³, 5.0× its usual 6.8Muscatine, 16 June: 16.8 µg/m³Muscatine, 17 June: 16.2 µg/m³Muscatine, 18 June: 20.3 µg/m³Muscatine, 19 June: 18.4 µg/m³Muscatine, 20 June: 18.6 µg/m³Muscatine, 21 June: 16.7 µg/m³Muscatine, 22 June: 19.7 µg/m³Valley StationValley Station, 11 June: 17.1 µg/m³Valley Station, 12 June: 11.7 µg/m³Valley Station, 13 June: 11.7 µg/m³Valley Station, 14 June: 12.6 µg/m³Valley Station, 15 June: 34.0 µg/m³, 4.1× its usual 8.2Valley Station, 16 June: 24.8 µg/m³Valley Station, 17 June: 27.6 µg/m³, 3.2× its usual 8.6Valley Station, 18 June: 32.4 µg/m³, 3.8× its usual 8.6Valley Station, 19 June: 10.8 µg/m³Valley Station, 20 June: 13.4 µg/m³Valley Station, 21 June: 15.2 µg/m³Valley Station, 22 June: 5.7 µg/m³North BayNorth Bay, 11 June: 14.8 µg/m³North Bay, 12 June: 13.2 µg/m³North Bay, 13 June: 6.4 µg/m³North Bay, 14 June: 8.9 µg/m³North Bay, 15 June: 14.2 µg/m³North Bay, 16 June: 35.9 µg/m³, 5.7× its usual 6.3North Bay, 17 June: 33.3 µg/m³, 5.2× its usual 6.4North Bay, 18 June: 60.4 µg/m³, 9.3× its usual 6.5North Bay, 19 June: 23.8 µg/m³North Bay, 20 June: 29.5 µg/m³North Bay, 21 June: 42.3 µg/m³North Bay, 22 June: 34.3 µg/m³BellevilleBelleville, 11 June: 29.5 µg/m³Belleville, 12 June: 21.6 µg/m³Belleville, 13 June: 11.5 µg/m³Belleville, 14 June: 11.0 µg/m³Belleville, 15 June: 9.8 µg/m³Belleville, 16 June: 29.2 µg/m³, 5.0× its usual 5.8Belleville, 17 June: 50.5 µg/m³, 8.6× its usual 5.9Belleville, 18 June: 24.6 µg/m³Belleville, 19 June: 8.5 µg/m³Belleville, 20 June: 9.2 µg/m³Belleville, 21 June: 14.6 µg/m³Belleville, 22 June: no readingOttawaOttawa, 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/m³Ottawa, 16 June: 44.5 µg/m³, 7.2× its usual 6.2Ottawa, 17 June: 10.2 µg/m³Ottawa, 18 June: 4.2 µg/m³Ottawa, 19 June: 6.2 µg/m³Ottawa, 20 June: 11.7 µg/m³Ottawa, 21 June: 8.0 µg/m³Ottawa, 22 June: 8.0 µg/m³ClevelandCleveland, 11 June: 25.0 µg/m³Cleveland, 12 June: 11.3 µg/m³Cleveland, 13 June: 12.3 µg/m³Cleveland, 14 June: 12.5 µg/m³Cleveland, 15 June: 16.2 µg/m³Cleveland, 16 June: 25.2 µg/m³, 2.7× its usual 9.4Cleveland, 17 June: 40.4 µg/m³, 4.2× its usual 9.6Cleveland, 18 June: 27.1 µg/m³, 2.8× its usual 9.8Cleveland, 19 June: 25.9 µg/m³, 2.6× its usual 9.9Cleveland, 20 June: 22.6 µg/m³Cleveland, 21 June: 20.8 µg/m³Cleveland, 22 June: 6.0 µg/m³DetroitDetroit, 11 June: 20.8 µg/m³Detroit, 12 June: 9.5 µg/m³Detroit, 13 June: 14.3 µg/m³Detroit, 14 June: 12.6 µg/m³Detroit, 15 June: 16.2 µg/m³Detroit, 16 June: 32.7 µg/m³, 3.8× its usual 8.5Detroit, 17 June: 40.3 µg/m³, 4.6× its usual 8.7Detroit, 18 June: no readingDetroit, 19 June: no readingDetroit, 20 June: 16.4 µg/m³Detroit, 21 June: 17.2 µg/m³Detroit, 22 June: 13.6 µg/m³WindsorWindsor, 11 June: 19.7 µg/m³Windsor, 12 June: 9.0 µg/m³Windsor, 13 June: 12.3 µg/m³Windsor, 14 June: 11.5 µg/m³Windsor, 15 June: 14.5 µg/m³Windsor, 16 June: 32.5 µg/m³, 4.0× its usual 8.1Windsor, 17 June: 40.0 µg/m³, 4.8× its usual 8.3Windsor, 18 June: 18.9 µg/m³Windsor, 19 June: 25.0 µg/m³, 2.9× its usual 8.6Windsor, 20 June: 15.4 µg/m³Windsor, 21 June: 15.5 µg/m³Windsor, 22 June: 11.7 µg/m³Lincoln ParkLincoln Park, 11 June: 22.6 µg/m³Lincoln Park, 12 June: 9.1 µg/m³Lincoln Park, 13 June: 12.1 µg/m³Lincoln Park, 14 June: 11.1 µg/m³Lincoln Park, 15 June: 13.6 µg/m³Lincoln Park, 16 June: 32.4 µg/m³, 3.9× its usual 8.3Lincoln Park, 17 June: 39.6 µg/m³, 4.8× its usual 8.2Lincoln Park, 18 June: no readingLincoln Park, 19 June: no readingLincoln Park, 20 June: 16.4 µg/m³Lincoln Park, 21 June: 16.8 µg/m³Lincoln Park, 22 June: 11.6 µg/m³DearbornDearborn, 11 June: 21.3 µg/m³Dearborn, 12 June: 9.4 µg/m³Dearborn, 13 June: 14.0 µg/m³Dearborn, 14 June: 13.3 µg/m³Dearborn, 15 June: 15.7 µg/m³Dearborn, 16 June: 32.6 µg/m³, 3.7× its usual 8.7Dearborn, 17 June: 38.7 µg/m³, 4.3× its usual 8.9Dearborn, 18 June: no readingDearborn, 19 June: no readingDearborn, 20 June: 16.2 µg/m³Dearborn, 21 June: 17.2 µg/m³Dearborn, 22 June: 12.9 µg/m³TaylorTaylor, 11 June: 20.8 µg/m³Taylor, 12 June: 8.5 µg/m³Taylor, 13 June: 11.8 µg/m³Taylor, 14 June: 10.7 µg/m³Taylor, 15 June: 14.9 µg/m³Taylor, 16 June: 31.0 µg/m³, 4.3× its usual 7.2Taylor, 17 June: 36.9 µg/m³, 5.1× its usual 7.3Taylor, 18 June: no readingTaylor, 19 June: no readingTaylor, 20 June: 15.4 µg/m³Taylor, 21 June: 16.0 µg/m³Taylor, 22 June: 11.5 µg/m³ElizabethtownElizabethtown, 11 June: 14.1 µg/m³Elizabethtown, 12 June: 11.3 µg/m³Elizabethtown, 13 June: 11.7 µg/m³Elizabethtown, 14 June: 11.9 µg/m³Elizabethtown, 15 June: 23.0 µg/m³Elizabethtown, 16 June: 26.4 µg/m³, 3.7× its usual 7.1Elizabethtown, 17 June: 31.6 µg/m³, 4.3× its usual 7.3Elizabethtown, 18 June: 36.6 µg/m³, 4.9× its usual 7.4Elizabethtown, 19 June: 8.7 µg/m³Elizabethtown, 20 June: 11.9 µg/m³Elizabethtown, 21 June: 15.1 µg/m³Elizabethtown, 22 June: 5.6 µg/m³RedfordRedford, 11 June: 20.2 µg/m³Redford, 12 June: 8.6 µg/m³Redford, 13 June: 14.6 µg/m³Redford, 14 June: 11.1 µg/m³Redford, 15 June: 15.7 µg/m³Redford, 16 June: 27.4 µg/m³, 2.7× its usual 10.0Redford, 17 June: 36.1 µg/m³, 3.6× its usual 10.0Redford, 18 June: no readingRedford, 19 June: no readingRedford, 20 June: 16.3 µg/m³Redford, 21 June: 15.6 µg/m³Redford, 22 June: 14.2 µg/m³CornwallCornwall, 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/m³Cornwall, 16 June: 35.0 µg/m³, 5.6× its usual 6.3Cornwall, 17 June: 7.7 µg/m³Cornwall, 18 June: 5.6 µg/m³Cornwall, 19 June: 5.1 µg/m³Cornwall, 20 June: 8.2 µg/m³Cornwall, 21 June: 7.5 µg/m³Cornwall, 22 June: 6.9 µg/m³MontréalMontréal, 11 June: 15.5 µg/m³Montréal, 12 June: 18.8 µg/m³Montréal, 13 June: 12.5 µg/m³Montréal, 14 June: 12.0 µg/m³Montréal, 15 June: 14.5 µg/m³Montréal, 16 June: 34.9 µg/m³, 4.9× its usual 7.1Montréal, 17 June: 4.8 µg/m³Montréal, 18 June: 4.1 µg/m³Montréal, 19 June: 4.6 µg/m³Montréal, 20 June: 7.9 µg/m³Montréal, 21 June: 7.5 µg/m³Montréal, 22 June: 8.3 µg/m³YpsilantiYpsilanti, 11 June: 19.4 µg/m³Ypsilanti, 12 June: 9.2 µg/m³Ypsilanti, 13 June: 12.1 µg/m³Ypsilanti, 14 June: 10.2 µg/m³Ypsilanti, 15 June: 18.0 µg/m³Ypsilanti, 16 June: 30.9 µg/m³, 4.4× its usual 7.1Ypsilanti, 17 June: 34.8 µg/m³, 4.7× its usual 7.4Ypsilanti, 18 June: no readingYpsilanti, 19 June: no readingYpsilanti, 20 June: 18.0 µg/m³Ypsilanti, 21 June: 18.5 µg/m³Ypsilanti, 22 June: 14.1 µg/m³MedinaMedina, 11 June: 24.8 µg/m³Medina, 12 June: 8.4 µg/m³Medina, 13 June: 10.7 µg/m³Medina, 14 June: 8.3 µg/m³Medina, 15 June: 10.8 µg/m³Medina, 16 June: 26.7 µg/m³, 3.7× its usual 7.3Medina, 17 June: 34.3 µg/m³, 4.6× its usual 7.4Medina, 18 June: 21.9 µg/m³Medina, 19 June: 19.9 µg/m³Medina, 20 June: 20.4 µg/m³Medina, 21 June: 20.4 µg/m³Medina, 22 June: 5.0 µg/m³Green BayGreen Bay, 11 June: 4.6 µg/m³Green Bay, 12 June: 6.1 µg/m³Green Bay, 13 June: 11.4 µg/m³Green Bay, 14 June: 21.8 µg/m³Green Bay, 15 June: 12.7 µg/m³Green Bay, 16 June: 22.7 µg/m³Green Bay, 17 June: 40.6 µg/m³, 6.4× its usual 6.3Green Bay, 18 June: 34.0 µg/m³, 5.2× its usual 6.5Green Bay, 19 June: 21.2 µg/m³Green Bay, 20 June: 19.9 µg/m³Green Bay, 21 June: 17.3 µg/m³Green Bay, 22 June: 27.7 µg/m³DublinDublin, 11 June: 24.0 µg/m³Dublin, 12 June: 8.0 µg/m³Dublin, 13 June: 12.1 µg/m³Dublin, 14 June: 6.4 µg/m³Dublin, 15 June: 15.5 µg/m³Dublin, 16 June: 22.3 µg/m³Dublin, 17 June: 40.2 µg/m³, 5.2× its usual 7.7Dublin, 18 June: 37.0 µg/m³, 4.7× its usual 7.9Dublin, 19 June: 26.4 µg/m³, 3.3× its usual 7.9Dublin, 20 June: 13.4 µg/m³Dublin, 21 June: 18.0 µg/m³Dublin, 22 June: 5.2 µg/m³Rouyn-NorandaRouyn-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/m³Rouyn-Noranda, 16 June: 21.2 µg/m³Rouyn-Noranda, 17 June: 26.4 µg/m³, 4.0× its usual 6.6Rouyn-Noranda, 18 June: 39.0 µg/m³, 5.9× its usual 6.6Rouyn-Noranda, 19 June: 17.3 µg/m³Rouyn-Noranda, 20 June: 32.2 µg/m³Rouyn-Noranda, 21 June: 52.2 µg/m³Rouyn-Noranda, 22 June: 51.9 µg/m³CantonCanton, 11 June: 27.5 µg/m³Canton, 12 June: 11.0 µg/m³Canton, 13 June: 13.6 µg/m³Canton, 14 June: 8.4 µg/m³Canton, 15 June: 16.9 µg/m³Canton, 16 June: 23.1 µg/m³Canton, 17 June: 38.2 µg/m³, 4.0× its usual 9.5Canton, 18 June: 27.4 µg/m³, 2.9× its usual 9.5Canton, 19 June: 25.0 µg/m³, 2.5× its usual 9.9Canton, 20 June: 21.2 µg/m³Canton, 21 June: 19.0 µg/m³Canton, 22 June: 5.6 µg/m³South BendSouth Bend, 11 June: 19.1 µg/m³South Bend, 12 June: 7.1 µg/m³South Bend, 13 June: 10.3 µg/m³South Bend, 14 June: 5.5 µg/m³South Bend, 15 June: 20.0 µg/m³South Bend, 16 June: 14.1 µg/m³South Bend, 17 June: 26.5 µg/m³, 3.1× its usual 8.6South Bend, 18 June: 38.2 µg/m³, 4.3× its usual 8.9South Bend, 19 June: 20.6 µg/m³South Bend, 20 June: 19.8 µg/m³South Bend, 21 June: 21.3 µg/m³South Bend, 22 June: 15.6 µg/m³AkronAkron, 11 June: 25.5 µg/m³Akron, 12 June: 11.1 µg/m³Akron, 13 June: 11.3 µg/m³Akron, 14 June: 8.3 µg/m³Akron, 15 June: 12.7 µg/m³Akron, 16 June: 24.5 µg/m³Akron, 17 June: 37.1 µg/m³, 4.8× its usual 7.7Akron, 18 June: 27.0 µg/m³, 3.5× its usual 7.8Akron, 19 June: 21.1 µg/m³Akron, 20 June: 21.2 µg/m³Akron, 21 June: 19.3 µg/m³Akron, 22 June: 4.7 µg/m³MiddletownMiddletown, 11 June: 20.2 µg/m³Middletown, 12 June: 9.8 µg/m³Middletown, 13 June: 10.5 µg/m³Middletown, 14 June: 8.7 µg/m³Middletown, 15 June: 20.4 µg/m³Middletown, 16 June: 22.6 µg/m³Middletown, 17 June: 35.5 µg/m³, 3.4× its usual 10.5Middletown, 18 June: 35.5 µg/m³, 3.3× its usual 10.7Middletown, 19 June: 23.5 µg/m³Middletown, 20 June: 15.4 µg/m³Middletown, 21 June: 18.2 µg/m³Middletown, 22 June: 5.8 µg/m³PittsburghPittsburgh, 11 June: 27.2 µg/m³Pittsburgh, 12 June: 13.1 µg/m³Pittsburgh, 13 June: 10.9 µg/m³Pittsburgh, 14 June: 7.0 µg/m³Pittsburgh, 15 June: 12.4 µg/m³Pittsburgh, 16 June: 17.0 µg/m³Pittsburgh, 17 June: 34.6 µg/m³, 3.8× its usual 9.2Pittsburgh, 18 June: 22.9 µg/m³Pittsburgh, 19 June: 21.4 µg/m³Pittsburgh, 20 June: 19.4 µg/m³Pittsburgh, 21 June: 13.7 µg/m³Pittsburgh, 22 June: 3.6 µg/m³CheektowagaCheektowaga, 11 June: 23.1 µg/m³Cheektowaga, 12 June: 14.4 µg/m³Cheektowaga, 13 June: 3.8 µg/m³Cheektowaga, 14 June: 4.0 µg/m³Cheektowaga, 15 June: 8.6 µg/m³Cheektowaga, 16 June: 14.1 µg/m³Cheektowaga, 17 June: 28.0 µg/m³, 2.0× its usual 13.9Cheektowaga, 18 June: 34.4 µg/m³, 2.1× its usual 16.4Cheektowaga, 19 June: 17.1 µg/m³Cheektowaga, 20 June: 8.4 µg/m³Cheektowaga, 21 June: no readingCheektowaga, 22 June: no readingShaker HeightsShaker Heights, 11 June: 22.0 µg/m³Shaker Heights, 12 June: 11.4 µg/m³Shaker Heights, 13 June: 10.7 µg/m³Shaker Heights, 14 June: 11.8 µg/m³Shaker Heights, 15 June: 12.1 µg/m³Shaker Heights, 16 June: 22.5 µg/m³Shaker Heights, 17 June: 34.2 µg/m³, 5.0× its usual 6.9Shaker Heights, 18 June: 20.1 µg/m³Shaker Heights, 19 June: 20.5 µg/m³Shaker Heights, 20 June: 19.7 µg/m³Shaker Heights, 21 June: 19.0 µg/m³Shaker Heights, 22 June: 4.5 µg/m³SpringfieldSpringfield, 11 June: 19.8 µg/m³Springfield, 12 June: 8.7 µg/m³Springfield, 13 June: 9.7 µg/m³Springfield, 14 June: 5.9 µg/m³Springfield, 15 June: 16.6 µg/m³Springfield, 16 June: 21.5 µg/m³Springfield, 17 June: 33.1 µg/m³, 3.8× its usual 8.8Springfield, 18 June: 34.2 µg/m³, 3.8× its usual 8.9Springfield, 19 June: 26.3 µg/m³, 2.9× its usual 9.2Springfield, 20 June: 12.3 µg/m³Springfield, 21 June: 16.5 µg/m³Springfield, 22 June: 5.7 µg/m³WaukeshaWaukesha, 11 June: 5.8 µg/m³Waukesha, 12 June: 8.0 µg/m³Waukesha, 13 June: 14.5 µg/m³Waukesha, 14 June: 18.5 µg/m³Waukesha, 15 June: 23.2 µg/m³Waukesha, 16 June: 22.0 µg/m³Waukesha, 17 June: 33.8 µg/m³, 4.8× its usual 7.0Waukesha, 18 June: 31.9 µg/m³, 4.6× its usual 7.0Waukesha, 19 June: 29.2 µg/m³, 4.1× its usual 7.2Waukesha, 20 June: 22.1 µg/m³Waukesha, 21 June: 20.8 µg/m³Waukesha, 22 June: 26.2 µg/m³West MifflinWest Mifflin, 11 June: 34.3 µg/m³West Mifflin, 12 June: 12.4 µg/m³West Mifflin, 13 June: 11.8 µg/m³West Mifflin, 14 June: 7.1 µg/m³West Mifflin, 15 June: 19.5 µg/m³West Mifflin, 16 June: 16.2 µg/m³West Mifflin, 17 June: 29.7 µg/m³, 2.8× its usual 10.6West Mifflin, 18 June: 33.7 µg/m³, 3.0× its usual 11.1West Mifflin, 19 June: 22.5 µg/m³West Mifflin, 20 June: 19.0 µg/m³West Mifflin, 21 June: 12.4 µg/m³West Mifflin, 22 June: 3.3 µg/m³11 Jun1315171921
The 60 cities with the highest readings of 161, 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
Saint CloudMinnesota, United States3 99.514 June5.618×
Saint MichaelMinnesota, United States3 100.014 June5.817×
Saint PaulMinnesota, United States2 105.014 June6.317×
MinneapolisMinnesota, United States3 105.014 June6.815×
BurnsvilleMinnesota, United States3 95.514 June6.315×
BlaineMinnesota, United States2 84.814 June5.615×
ShakopeeMinnesota, United States2 89.014 June6.115×
Apple ValleyMinnesota, United States2 84.514 June5.914×
West FargoNorth Dakota, United States1 75.414 June6.112×
DuluthMinnesota, United States1 62.214 June5.711×
Eau ClaireWisconsin, United States1 55.914 June5.79.8×
North BayOntario, Canada3 60.418 June6.59.3×
SuperiorWisconsin, United States1 58.914 June6.88.7×
BellevilleOntario, Canada2 50.517 June5.98.6×
MolineIllinois, United States2 49.915 June6.18.2×
ClintonIowa, United States4 56.015 June7.08.0×
AberdeenSouth Dakota, United States1 39.915 June3.78.0×
RochesterMinnesota, United States2 55.515 June7.07.9×
DavenportIowa, United States2 49.015 June6.77.3×
Iowa CityIowa, United States1 46.315 June6.47.2×
OttawaOntario, Canada1 44.516 June6.27.2×
MadisonWisconsin, United States5 40.314 June5.86.9×
WaterlooIowa, United States1 51.315 June7.66.8×
AppletonWisconsin, United States4 40.217 June6.26.5×
Green BayWisconsin, United States2 40.617 June6.36.4×
WatertownSouth Dakota, United States1 36.615 June5.96.2×
Rouyn-NorandaQuebec, Canada2 39.018 June6.65.9×
CornwallOntario, Canada1 35.016 June6.35.6×
JeffersontownKentucky, United States4 39.315 June7.25.5×
JeffersonvilleIndiana, United States4 43.815 June8.25.3×
Saint MatthewsKentucky, United States4 39.515 June7.55.3×
DublinOhio, United States3 40.217 June7.75.2×
TaylorMichigan, United States2 36.917 June7.35.1×
Shaker HeightsOhio, United States1 34.217 June6.95.0×
MuscatineIowa, United States1 34.015 June6.85.0×
ChathamOntario, Canada2 31.717 June6.35.0×
ConwaySouth Carolina, United States2 30.218 June6.15.0×
LouisvilleKentucky, United States3 39.815 June8.14.9×
ElizabethtownKentucky, United States3 36.618 June7.44.9×
RockfordIllinois, United States4 36.315 June7.44.9×
MontréalQuebec, Canada1 34.916 June7.14.9×
PeterboroughOntario, Canada3 31.718 June6.54.9×
Saint-Jean-sur-RichelieuQuebec, Canada1 26.116 June5.34.9×
WindsorOntario, Canada3 40.017 June8.34.8×
Lincoln ParkMichigan, United States2 39.617 June8.24.8×
AkronOhio, United States2 37.117 June7.74.8×
WaukeshaWisconsin, United States3 33.817 June7.04.8×
YpsilantiMichigan, United States2 34.817 June7.44.7×
BloomingtonIndiana, United States3 29.815 June6.44.7×
GahannaOhio, United States1 28.617 June6.14.7×
DetroitMichigan, United States2 40.317 June8.74.6×
MedinaOhio, United States2 34.317 June7.44.6×
Fort ThomasKentucky, United States2 31.517 June6.84.6×
Rivière-des-Prairies–Pointe-aux-TremblesQuebec, Canada1 28.416 June6.24.6×
AndersonIndiana, United States3 32.618 June7.34.5×
St. ThomasOntario, Canada3 32.116 June7.14.5×
DorvalQuebec, Canada1 30.316 June6.74.5×
GranbyQuebec, Canada1 29.116 June6.54.5×
St. CatharinesOntario, Canada3 31.618 June7.24.4×
Weirton HeightsWest Virginia, United States1 30.617 June6.94.4×
South MilwaukeeWisconsin, United States3 30.118 June6.84.4×
EriePennsylvania, United States2 29.717 June6.74.4×
DearbornMichigan, United States2 38.717 June8.94.3×
South BendIndiana, United States2 38.218 June8.94.3×
SarniaOntario, Canada3 32.519 June7.64.3×
BloomingtonIllinois, United States5 27.718 June6.54.3×
ClevelandOhio, United States4 40.417 June9.64.2×
East ChicagoIndiana, United States1 31.418 June7.44.2×
RoanokeVirginia, United States2 30.816 June7.34.2×
Port HuronMichigan, United States2 29.516 June7.04.2×
BrossardQuebec, Canada1 29.316 June6.94.2×
State CollegePennsylvania, United States1 26.717 June6.44.2×
Valley StationKentucky, United States3 34.015 June8.24.1×
HermitagePennsylvania, United States1 28.517 June7.04.1×
CantonOhio, United States3 38.217 June9.54.0×
BuffaloNew York, United States2 32.117 June8.14.0×
LondonOntario, Canada3 29.916 June7.54.0×
AshlandKentucky, United States3 29.817 June7.54.0×
MasonOhio, United States2 29.317 June7.34.0×
JohnstownPennsylvania, United States1 27.917 June7.04.0×
Lexington-FayetteKentucky, United States1 26.518 June6.64.0×
IndianapolisIndiana, United States3 38.918 June10.03.9×
NapervilleIllinois, United States4 34.817 June8.93.9×
WilkinsburgPennsylvania, United States1 33.317 June8.53.9×
MilwaukeeWisconsin, United States3 32.518 June8.33.9×
YoungstownOhio, United States1 31.617 June8.13.9×
KitchenerOntario, Canada1 30.216 June7.73.9×
LebanonOhio, United States2 28.418 June7.33.9×
New AlbanyIndiana, United States2 28.318 June7.23.9×
PittsburghPennsylvania, United States1 34.617 June9.23.8×
SpringfieldOhio, United States3 34.218 June8.93.8×
DaytonOhio, United States3 33.418 June8.83.8×
Calumet CityIllinois, United States3 31.617 June8.43.8×
McKeesportPennsylvania, United States1 31.517 June8.43.8×
CaryIllinois, United States3 31.017 June8.23.8×
Des PlainesIllinois, United States2 31.017 June8.13.8×
AltoonaPennsylvania, United States2 26.817 June7.03.8×
WarrenOhio, United States1 33.317 June9.03.7×
GreenvilleSouth Carolina, United States2 29.317 June8.03.7×
ChesterPennsylvania, United States1 26.018 June7.13.7×
RedfordMichigan, United States2 36.117 June10.03.6×
JolietIllinois, United States4 32.117 June8.83.6×
FlintMichigan, United States2 26.816 June7.53.6×
CharlottesvilleVirginia, United States1 26.518 June7.43.6×
NorwoodOhio, United States2 32.817 June9.53.5×
CincinnatiOhio, United States2 32.118 June9.33.5×
HammondIndiana, United States3 30.817 June8.93.5×
ScrantonPennsylvania, United States1 27.117 June7.83.5×
Rose HillVirginia, United States2 26.517 June7.53.5×
MiddletownOhio, United States2 35.517 June10.53.4×
SpartanburgSouth Carolina, United States2 33.517 June10.03.4×
SteubenvilleOhio, United States1 32.917 June9.73.4×
PortageIndiana, United States1 28.818 June8.43.4×
BensalemPennsylvania, United States1 28.318 June8.43.4×
BrantfordOntario, Canada2 28.116 June8.33.4×
BarrieOntario, Canada1 27.216 June7.93.4×
LansingMichigan, United States1 27.016 June7.93.4×
LancasterPennsylvania, United States2 26.819 June8.03.4×
RichmondVirginia, United States2 26.518 June7.73.4×
KingsportTennessee, United States1 25.718 June7.63.4×
East HamptonVirginia, United States1 25.118 June7.33.4×
KokomoIndiana, United States1 25.118 June7.33.4×
ToledoOhio, United States1 28.317 June8.73.3×
NorthbrookIllinois, United States1 27.518 June8.33.3×
JenisonMichigan, United States1 25.917 June7.83.3×
La CrosseWisconsin, United States3 35.115 June11.13.2×
GainesvilleGeorgia, United States1 31.518 June9.83.2×
FlorenceSouth Carolina, United States2 29.117 June9.13.2×
KnoxvilleTennessee, United States1 27.518 June8.73.2×
ClaytonNorth Carolina, United States2 27.417 June8.53.2×
KenmoreNew York, United States1 27.418 June8.53.2×
DecaturIllinois, United States2 26.918 June8.33.2×
RaleighNorth Carolina, United States2 26.818 June8.43.2×
LafayetteIndiana, United States1 26.618 June8.23.2×
GreenvilleNorth Carolina, United States1 25.518 June8.03.2×
ElkhartIndiana, United States1 30.818 June9.93.1×
Saint AndrewsSouth Carolina, United States1 29.218 June9.43.1×
Winston-SalemNorth Carolina, United States2 27.418 June8.83.1×
TorontoOntario, Canada1 26.318 June8.43.1×
ClemmonsNorth Carolina, United States1 26.218 June8.53.1×
West MifflinPennsylvania, United States2 33.718 June11.13.0×
LimaOhio, United States1 32.017 June10.63.0×
PhiladelphiaPennsylvania, United States1 28.118 June9.33.0×
LawrencevilleGeorgia, United States1 26.718 June9.03.0×
Terre HauteIndiana, United States2 32.218 June11.12.9×
Franklin ParkIllinois, United States2 27.217 June9.42.9×
Grand RapidsMichigan, United States1 26.517 June9.22.9×
New York CityNew York, United States1 26.117 June8.92.9×
EvansvilleIndiana, United States1 25.918 June8.82.9×
PennsaukenNew Jersey, United States1 25.918 June9.42.8×
ChicagoIllinois, United States1 25.918 June9.32.8×
Roanoke RapidsNorth Carolina, United States1 25.819 June9.22.8×
Granite CityIllinois, United States1 25.316 June9.22.8×
GreensboroNorth Carolina, United States1 25.018 June9.02.8×
HarrisburgPennsylvania, United States1 25.019 June8.92.8×
East RidgeTennessee, United States2 27.718 June10.22.7×
ChattanoogaTennessee, United States2 26.117 June9.72.7×
OwensboroKentucky, United States2 26.716 June10.12.6×
GaryIndiana, United States1 25.418 June9.82.6×
Candler-McAfeeGeorgia, United States1 25.118 June9.72.6×
CheektowagaNew York, United States2 34.418 June16.42.1×

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 7 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, 14 to 19 June 2023: 161 cities with PM2.5 at twice their usual or more, 14 to 19 June 2023, smogrank.com/episodes/2023-06-14-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.