SmogRank / Episodes / United States

North-western United States and Canada, August 2026

For 8 days, from 4 to 11 August 2026, 99 cities in the United States and Canada had PM2.5 at least twice their usual for the time of year. The worst reading was Wenatchee, Washington, United States: 204.0 µg/m³ on 4 August, about 41× its usual 5.0.

No cause namedWe have no fire or smoke records for these days, so we only say what the measurements show.
Cities reached99in 2 countries
Days84 to 11 August 2026
Worst day5 August81 cities counted
Furthest above usual41×Wenatchee

Day by day

5 August 81 cities at twice their usual or more
KennewickLethbridgeLoganNorth OgdenBountifulMagnaMedicine HatSalt Lake CityWest Valley CityHerrimanHighlandOremSpanish ForkMonroeRedmondRock SpringsMount VernonAnacortesDeltaSwift CurrentPort AngelesVictoriaRichmondVancouverCentral SaanichLangfordAberdeenParadiseReddingDuncanNorth CowichanChicoCasperNanaimoHarewoodCoos BaySaskatoonLaramieCampbell RiverCheyenneFort CollinsReginaBoulderLongmontWindsorGoldenArvadaGreeleyWestminsterNorthglennLakewoodThorntonDenverBrightonCalgaryAirdrieMillcreekGreat FallsWest JordanTooeleBrigham CityGilletteMedfordAshlandHelenaIdaho FallsAltamontMoscowPocatelloBellinghamLewistonSeattleSheridanPort AlberniSquamishMarysvilleColumbia CityBillingsStrawberry HillBremertonRoseburgPicnic Point-North LynnwoodBurnabyRedmondLaceyMissoulaShorelineGrants PassWest VancouverPullmanBendLangleyLongviewMeridianBurienPort CoquitlamNorth VancouverRentonTacomaCoeur d'AleneForest GroveBoiseBellevueAuburnNampaBozemanSpokaneKentMilwaukieButteKelownaCoquitlamParklandTwin FallsCentraliaHermistonSpokane ValleySalmon CreekVancouverInglewood-Finn HillAbbotsfordSunnysideHillsboroCranbrookBothellPortlandPendletonMcMinnvilleTigardKirklandTri-CitiesMoses LakeWoodburnDallasBeavertonSalemCorvallisVernonChilliwackNorth CreekUnion Hill-Novelty HillPascoWalla WallaEllensburgGreshamThe DallesAlbanyKamloopsYakimaOregon CityCanbyEugeneWenatchee
1 Aug234567891011121314
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

KamloopsKamloops, 1 August: 79.2 µg/m³, 7.1× usualKamloops, 2 August: 25.3 µg/m³, 2.3× usualKamloops, 3 August: 6.1 µg/m³, 0.5× usualKamloops, 4 August: 31.8 µg/m³, 2.8× usualKamloops, 5 August: 73.2 µg/m³, 6.5× usualKamloops, 6 August: 146.0 µg/m³, 13× usualKamloops, 7 August: 191.0 µg/m³, 17× usualKamloops, 8 August: 140.0 µg/m³, 13× usualKamloops, 9 August: 167.0 µg/m³, 15× usualKamloops, 10 August: 97.5 µg/m³, 8.7× usualKamloops, 11 August: 18.4 µg/m³, 1.6× usualKamloops, 12 August: 8.0 µg/m³, 0.7× usualKamloops, 13 August: 9.3 µg/m³, 0.8× usualKamloops, 14 August: 19.3 µg/m³, 1.7× usualVernonVernon, 1 August: 28.3 µg/m³, 3.1× usualVernon, 2 August: 26.4 µg/m³, 2.9× usualVernon, 3 August: 8.7 µg/m³, 1.0× usualVernon, 4 August: 19.3 µg/m³, 2.1× usualVernon, 5 August: 61.7 µg/m³, 6.8× usualVernon, 6 August: 122.0 µg/m³, 13× usualVernon, 7 August: 102.0 µg/m³, 11× usualVernon, 8 August: 71.8 µg/m³, 7.9× usualVernon, 9 August: 102.0 µg/m³, 11× usualVernon, 10 August: 142.0 µg/m³, 16× usualVernon, 11 August: 118.0 µg/m³, 13× usualVernon, 12 August: 7.5 µg/m³, 0.8× usualVernon, 13 August: 9.3 µg/m³, 1.0× usualVernon, 14 August: 8.7 µg/m³, 1.0× usualNampaNampa, 1 August: 39.2 µg/m³, 4.1× usualNampa, 2 August: 33.4 µg/m³, 3.5× usualNampa, 3 August: 65.3 µg/m³, 6.8× usualNampa, 4 August: 66.8 µg/m³, 7.0× usualNampa, 5 August: 38.1 µg/m³, 4.0× usualNampa, 6 August: 45.1 µg/m³, 4.7× usualNampa, 7 August: 77.5 µg/m³, 8.1× usualNampa, 8 August: 70.8 µg/m³, 7.4× usualNampa, 9 August: 35.7 µg/m³, 3.7× usualNampa, 10 August: 34.3 µg/m³, 3.6× usualNampa, 11 August: 39.4 µg/m³, 4.1× usualNampa, 12 August: 24.3 µg/m³, 2.5× usualNampa, 13 August: 26.3 µg/m³, 2.7× usualNampa, 14 August: 14.1 µg/m³, 1.5× usualMeridianMeridian, 1 August: 36.4 µg/m³, 4.3× usualMeridian, 2 August: 40.4 µg/m³, 4.8× usualMeridian, 3 August: 59.2 µg/m³, 7.0× usualMeridian, 4 August: 58.6 µg/m³, 7.0× usualMeridian, 5 August: 30.1 µg/m³, 3.6× usualMeridian, 6 August: 28.8 µg/m³, 3.4× usualMeridian, 7 August: 58.0 µg/m³, 6.9× usualMeridian, 8 August: 59.0 µg/m³, 7.0× usualMeridian, 9 August: 32.0 µg/m³, 3.8× usualMeridian, 10 August: 31.8 µg/m³, 3.8× usualMeridian, 11 August: 34.8 µg/m³, 4.1× usualMeridian, 12 August: 24.9 µg/m³, 3.0× usualMeridian, 13 August: 22.9 µg/m³, 2.7× usualMeridian, 14 August: 12.2 µg/m³, 1.5× usualMissoulaMissoula, 1 August: 25.4 µg/m³, 3.5× usualMissoula, 2 August: 18.9 µg/m³, 2.6× usualMissoula, 3 August: 49.4 µg/m³, 6.8× usualMissoula, 4 August: 23.1 µg/m³, 3.2× usualMissoula, 5 August: 22.0 µg/m³, 3.0× usualMissoula, 6 August: 39.5 µg/m³, 5.4× usualMissoula, 7 August: 37.6 µg/m³, 5.2× usualMissoula, 8 August: 26.9 µg/m³, 3.7× usualMissoula, 9 August: 46.7 µg/m³, 6.4× usualMissoula, 10 August: 55.1 µg/m³, 7.5× usualMissoula, 11 August: 47.1 µg/m³, 6.5× usualMissoula, 12 August: 30.5 µg/m³, 4.2× usualMissoula, 13 August: 7.8 µg/m³, 1.1× usualMissoula, 14 August: 8.9 µg/m³, 1.2× usualBoiseBoise, 1 August: 36.3 µg/m³, 5.0× usualBoise, 2 August: 54.8 µg/m³, 7.5× usualBoise, 3 August: 52.1 µg/m³, 7.1× usualBoise, 4 August: 54.0 µg/m³, 7.4× usualBoise, 5 August: 26.9 µg/m³, 3.7× usualBoise, 6 August: 26.9 µg/m³, 3.7× usualBoise, 7 August: 54.7 µg/m³, 7.5× usualBoise, 8 August: 54.8 µg/m³, 7.5× usualBoise, 9 August: 34.1 µg/m³, 4.7× usualBoise, 10 August: 34.7 µg/m³, 4.8× usualBoise, 11 August: 41.1 µg/m³, 5.6× usualBoise, 12 August: 30.6 µg/m³, 4.2× usualBoise, 13 August: 23.8 µg/m³, 3.3× usualBoise, 14 August: 12.0 µg/m³, 1.6× usualCalgaryCalgary, 1 August: 52.4 µg/m³, 4.0× usualCalgary, 2 August: 38.1 µg/m³, 2.9× usualCalgary, 3 August: 5.8 µg/m³, 0.4× usualCalgary, 4 August: 8.3 µg/m³, 0.6× usualCalgary, 5 August: 10.2 µg/m³, 0.8× usualCalgary, 6 August: 10.5 µg/m³, 0.8× usualCalgary, 7 August: 18.6 µg/m³, 1.4× usualCalgary, 8 August: 18.8 µg/m³, 1.4× usualCalgary, 9 August: 27.6 µg/m³, 2.1× usualCalgary, 10 August: 20.6 µg/m³, 1.6× usualCalgary, 11 August: 23.9 µg/m³, 1.8× usualCalgary, 12 August: 5.1 µg/m³, 0.4× usualCalgary, 13 August: 9.4 µg/m³, 0.7× usualCalgary, 14 August: 7.0 µg/m³, 0.5× usualLewistonLewiston, 1 August: 29.3 µg/m³, 2.8× usualLewiston, 2 August: 6.5 µg/m³, 0.6× usualLewiston, 3 August: 32.2 µg/m³, 3.0× usualLewiston, 4 August: 43.4 µg/m³, 4.1× usualLewiston, 5 August: 32.1 µg/m³, 3.0× usualLewiston, 6 August: 46.6 µg/m³, 4.4× usualLewiston, 7 August: 51.9 µg/m³, 4.9× usualLewiston, 8 August: 27.0 µg/m³, 2.5× usualLewiston, 9 August: 22.8 µg/m³, 2.2× usualLewiston, 10 August: 19.9 µg/m³, 1.9× usualLewiston, 11 August: 22.2 µg/m³, 2.1× usualLewiston, 12 August: 16.9 µg/m³, 1.6× usualLewiston, 13 August: 29.3 µg/m³, 2.8× usualLewiston, 14 August: 21.4 µg/m³, 2.0× usualAirdrieAirdrie, 1 August: 48.2 µg/m³, 4.5× usualAirdrie, 2 August: 33.4 µg/m³, 3.1× usualAirdrie, 3 August: 5.0 µg/m³, 0.5× usualAirdrie, 4 August: 6.4 µg/m³, 0.6× usualAirdrie, 5 August: 7.2 µg/m³, 0.7× usualAirdrie, 6 August: 7.1 µg/m³, 0.7× usualAirdrie, 7 August: 15.9 µg/m³, 1.5× usualAirdrie, 8 August: 15.9 µg/m³, 1.5× usualAirdrie, 9 August: 26.2 µg/m³, 2.4× usualAirdrie, 10 August: 19.1 µg/m³, 1.8× usualAirdrie, 11 August: 18.6 µg/m³, 1.7× usualAirdrie, 12 August: 3.7 µg/m³, 0.3× usualAirdrie, 13 August: 6.6 µg/m³, 0.6× usualAirdrie, 14 August: 5.1 µg/m³, 0.5× usualGreat FallsGreat Falls, 1 August: 31.4 µg/m³, 2.4× usualGreat Falls, 2 August: 38.0 µg/m³, 2.9× usualGreat Falls, 3 August: 18.9 µg/m³, 1.4× usualGreat Falls, 4 August: 16.4 µg/m³, 1.2× usualGreat Falls, 5 August: 18.0 µg/m³, 1.4× usualGreat Falls, 6 August: 28.0 µg/m³, 2.1× usualGreat Falls, 7 August: 23.6 µg/m³, 1.8× usualGreat Falls, 8 August: 40.5 µg/m³, 3.0× usualGreat Falls, 9 August: 37.3 µg/m³, 2.8× usualGreat Falls, 10 August: 44.5 µg/m³, 3.3× usualGreat Falls, 11 August: 33.4 µg/m³, 2.5× usualGreat Falls, 12 August: 20.9 µg/m³, 1.6× usualGreat Falls, 13 August: 12.8 µg/m³, 1.0× usualGreat Falls, 14 August: 9.5 µg/m³, 0.7× usualSpokane ValleySpokane Valley, 1 August: 12.3 µg/m³, 1.4× usualSpokane Valley, 2 August: 58.9 µg/m³, 6.5× usualSpokane Valley, 3 August: 95.6 µg/m³, 11× usualSpokane Valley, 4 August: 64.5 µg/m³, 7.1× usualSpokane Valley, 5 August: 39.2 µg/m³, 4.3× usualSpokane Valley, 6 August: 53.4 µg/m³, 5.9× usualSpokane Valley, 7 August: 46.5 µg/m³, 5.1× usualSpokane Valley, 8 August: 59.8 µg/m³, 6.6× usualSpokane Valley, 9 August: 82.8 µg/m³, 9.1× usualSpokane Valley, 10 August: 33.8 µg/m³, 3.7× usualSpokane Valley, 11 August: 27.9 µg/m³, 3.1× usualSpokane Valley, 12 August: 29.9 µg/m³, 3.3× usualSpokane Valley, 13 August: 17.8 µg/m³, 2.0× usualSpokane Valley, 14 August: 8.4 µg/m³, 0.9× usualCranbrookCranbrook, 1 August: 14.5 µg/m³, 1.6× usualCranbrook, 2 August: 39.8 µg/m³, 4.4× usualCranbrook, 3 August: 22.2 µg/m³, 2.4× usualCranbrook, 4 August: 15.7 µg/m³, 1.7× usualCranbrook, 5 August: 26.0 µg/m³, 2.9× usualCranbrook, 6 August: 67.0 µg/m³, 7.4× usualCranbrook, 7 August: 84.2 µg/m³, 9.3× usualCranbrook, 8 August: 63.8 µg/m³, 7.0× usualCranbrook, 9 August: 93.4 µg/m³, 10× usualCranbrook, 10 August: 68.4 µg/m³, 7.5× usualCranbrook, 11 August: 58.5 µg/m³, 6.4× usualCranbrook, 12 August: 29.2 µg/m³, 3.2× usualCranbrook, 13 August: 8.2 µg/m³, 0.9× usualCranbrook, 14 August: 2.3 µg/m³, 0.3× usualSpokaneSpokane, 1 August: 15.0 µg/m³, 1.6× usualSpokane, 2 August: 58.5 µg/m³, 6.4× usualSpokane, 3 August: 93.1 µg/m³, 10× usualSpokane, 4 August: 68.6 µg/m³, 7.5× usualSpokane, 5 August: 45.2 µg/m³, 4.9× usualSpokane, 6 August: 54.4 µg/m³, 5.9× usualSpokane, 7 August: 49.3 µg/m³, 5.4× usualSpokane, 8 August: 50.0 µg/m³, 5.4× usualSpokane, 9 August: 75.2 µg/m³, 8.2× usualSpokane, 10 August: 36.5 µg/m³, 4.0× usualSpokane, 11 August: 24.4 µg/m³, 2.7× usualSpokane, 12 August: 28.4 µg/m³, 3.1× usualSpokane, 13 August: 18.5 µg/m³, 2.0× usualSpokane, 14 August: 8.4 µg/m³, 0.9× usualMoses LakeMoses Lake, 1 August: 5.1 µg/m³, 0.7× usualMoses Lake, 2 August: 34.8 µg/m³, 4.6× usualMoses Lake, 3 August: 69.6 µg/m³, 9.3× usualMoses Lake, 4 August: 85.1 µg/m³, 11× usualMoses Lake, 5 August: 69.3 µg/m³, 9.2× usualMoses Lake, 6 August: 58.1 µg/m³, 7.7× usualMoses Lake, 7 August: 40.4 µg/m³, 5.4× usualMoses Lake, 8 August: 44.9 µg/m³, 6.0× usualMoses Lake, 9 August: 87.1 µg/m³, 12× usualMoses Lake, 10 August: 36.3 µg/m³, 4.8× usualMoses Lake, 11 August: 42.0 µg/m³, 5.6× usualMoses Lake, 12 August: 36.4 µg/m³, 4.9× usualMoses Lake, 13 August: 16.5 µg/m³, 2.2× usualMoses Lake, 14 August: 10.7 µg/m³, 1.4× usualCoeur d'AleneCoeur d'Alene, 1 August: 9.9 µg/m³, 1.0× usualCoeur d'Alene, 2 August: 68.3 µg/m³, 6.8× usualCoeur d'Alene, 3 August: 76.0 µg/m³, 7.6× usualCoeur d'Alene, 4 August: 50.5 µg/m³, 5.1× usualCoeur d'Alene, 5 August: no readingCoeur d'Alene, 6 August: 44.7 µg/m³, 4.5× usualCoeur d'Alene, 7 August: 41.0 µg/m³, 4.1× usualCoeur d'Alene, 8 August: 54.0 µg/m³, 5.4× usualCoeur d'Alene, 9 August: 73.9 µg/m³, 7.4× usualCoeur d'Alene, 10 August: 24.2 µg/m³, 2.4× usualCoeur d'Alene, 11 August: 17.7 µg/m³, 1.8× usualCoeur d'Alene, 12 August: 23.4 µg/m³, 2.3× usualCoeur d'Alene, 13 August: 13.2 µg/m³, 1.3× usualCoeur d'Alene, 14 August: 6.9 µg/m³, 0.7× usualTwin FallsTwin Falls, 1 August: 13.8 µg/m³, 2.1× usualTwin Falls, 2 August: 53.1 µg/m³, 8.0× usualTwin Falls, 3 August: 25.0 µg/m³, 3.8× usualTwin Falls, 4 August: 56.1 µg/m³, 8.5× usualTwin Falls, 5 August: 30.0 µg/m³, 4.5× usualTwin Falls, 6 August: 18.0 µg/m³, 2.7× usualTwin Falls, 7 August: 28.2 µg/m³, 4.3× usualTwin Falls, 8 August: 48.1 µg/m³, 7.3× usualTwin Falls, 9 August: 43.9 µg/m³, 6.7× usualTwin Falls, 10 August: 27.0 µg/m³, 4.1× usualTwin Falls, 11 August: 28.9 µg/m³, 4.4× usualTwin Falls, 12 August: 31.2 µg/m³, 4.7× usualTwin Falls, 13 August: 15.2 µg/m³, 2.3× usualTwin Falls, 14 August: 11.3 µg/m³, 1.7× usualPocatelloPocatello, 1 August: 7.0 µg/m³, 1.2× usualPocatello, 2 August: 49.3 µg/m³, 8.5× usualPocatello, 3 August: 26.8 µg/m³, 4.6× usualPocatello, 4 August: no readingPocatello, 5 August: 21.9 µg/m³, 3.8× usualPocatello, 6 August: 14.0 µg/m³, 2.4× usualPocatello, 7 August: 19.5 µg/m³, 3.4× usualPocatello, 8 August: 22.2 µg/m³, 3.8× usualPocatello, 9 August: 27.8 µg/m³, 4.8× usualPocatello, 10 August: 16.0 µg/m³, 2.8× usualPocatello, 11 August: 18.9 µg/m³, 3.3× usualPocatello, 12 August: 11.2 µg/m³, 1.9× usualPocatello, 13 August: 11.9 µg/m³, 2.1× usualPocatello, 14 August: 9.5 µg/m³, 1.6× usualIdaho FallsIdaho Falls, 1 August: 7.7 µg/m³, 1.3× usualIdaho Falls, 2 August: 44.9 µg/m³, 7.6× usualIdaho Falls, 3 August: 19.4 µg/m³, 3.3× usualIdaho Falls, 4 August: 22.9 µg/m³, 3.9× usualIdaho Falls, 5 August: 19.6 µg/m³, 3.3× usualIdaho Falls, 6 August: 20.1 µg/m³, 3.4× usualIdaho Falls, 7 August: 21.3 µg/m³, 3.6× usualIdaho Falls, 8 August: 21.7 µg/m³, 3.7× usualIdaho Falls, 9 August: 26.7 µg/m³, 4.5× usualIdaho Falls, 10 August: 19.3 µg/m³, 3.3× usualIdaho Falls, 11 August: 21.3 µg/m³, 3.6× usualIdaho Falls, 12 August: 10.2 µg/m³, 1.7× usualIdaho Falls, 13 August: 8.3 µg/m³, 1.4× usualIdaho Falls, 14 August: 8.3 µg/m³, 1.4× usualWenatcheeWenatchee, 1 August: 4.9 µg/m³, 1.0× usualWenatchee, 2 August: 3.0 µg/m³, 0.6× usualWenatchee, 3 August: 79.7 µg/m³, 16× usualWenatchee, 4 August: 204.0 µg/m³, 41× usualWenatchee, 5 August: 146.0 µg/m³, 29× usualWenatchee, 6 August: 146.0 µg/m³, 29× usualWenatchee, 7 August: 99.9 µg/m³, 20× usualWenatchee, 8 August: 8.6 µg/m³, 1.7× usualWenatchee, 9 August: 14.0 µg/m³, 2.8× usualWenatchee, 10 August: 5.2 µg/m³, 1.0× usualWenatchee, 11 August: 6.1 µg/m³, 1.2× usualWenatchee, 12 August: 38.7 µg/m³, 7.7× usualWenatchee, 13 August: 57.5 µg/m³, 12× usualWenatchee, 14 August: 35.2 µg/m³, 7.0× usualWalla WallaWalla Walla, 1 August: 13.4 µg/m³, 1.9× usualWalla Walla, 2 August: 3.1 µg/m³, 0.4× usualWalla Walla, 3 August: 32.2 µg/m³, 4.5× usualWalla Walla, 4 August: 71.3 µg/m³, 9.9× usualWalla Walla, 5 August: 108.0 µg/m³, 15× usualWalla Walla, 6 August: 105.0 µg/m³, 15× usualWalla Walla, 7 August: 51.0 µg/m³, 7.1× usualWalla Walla, 8 August: 18.4 µg/m³, 2.6× usualWalla Walla, 9 August: 8.0 µg/m³, 1.1× usualWalla Walla, 10 August: 10.3 µg/m³, 1.4× usualWalla Walla, 11 August: 11.0 µg/m³, 1.5× usualWalla Walla, 12 August: 14.0 µg/m³, 1.9× usualWalla Walla, 13 August: 24.3 µg/m³, 3.4× usualWalla Walla, 14 August: 20.0 µg/m³, 2.8× usualYakimaYakima, 1 August: 4.1 µg/m³, 0.7× usualYakima, 2 August: 4.3 µg/m³, 0.7× usualYakima, 3 August: 47.5 µg/m³, 8.2× usualYakima, 4 August: 100.0 µg/m³, 17× usualYakima, 5 August: 91.4 µg/m³, 16× usualYakima, 6 August: 57.1 µg/m³, 9.8× usualYakima, 7 August: 24.6 µg/m³, 4.2× usualYakima, 8 August: 10.4 µg/m³, 1.8× usualYakima, 9 August: 36.2 µg/m³, 6.2× usualYakima, 10 August: 2.8 µg/m³, 0.5× usualYakima, 11 August: 6.3 µg/m³, 1.1× usualYakima, 12 August: 25.9 µg/m³, 4.5× usualYakima, 13 August: 48.5 µg/m³, 8.4× usualYakima, 14 August: 27.1 µg/m³, 4.7× usualPendletonPendleton, 1 August: 14.3 µg/m³, 1.8× usualPendleton, 2 August: 7.7 µg/m³, 1.0× usualPendleton, 3 August: 31.3 µg/m³, 3.9× usualPendleton, 4 August: 78.6 µg/m³, 9.8× usualPendleton, 5 August: 86.3 µg/m³, 11× usualPendleton, 6 August: 78.2 µg/m³, 9.8× usualPendleton, 7 August: 48.1 µg/m³, 6.0× usualPendleton, 8 August: 31.4 µg/m³, 3.9× usualPendleton, 9 August: 14.6 µg/m³, 1.8× usualPendleton, 10 August: 14.8 µg/m³, 1.9× usualPendleton, 11 August: 15.8 µg/m³, 2.0× usualPendleton, 12 August: 12.2 µg/m³, 1.5× usualPendleton, 13 August: 20.9 µg/m³, 2.6× usualPendleton, 14 August: 21.4 µg/m³, 2.7× usualEllensburgEllensburg, 1 August: 4.1 µg/m³, 0.7× usualEllensburg, 2 August: 4.3 µg/m³, 0.8× usualEllensburg, 3 August: 45.1 µg/m³, 8.2× usualEllensburg, 4 August: 84.0 µg/m³, 15× usualEllensburg, 5 August: 83.9 µg/m³, 15× usualEllensburg, 6 August: 43.2 µg/m³, 7.9× usualEllensburg, 7 August: 24.7 µg/m³, 4.5× usualEllensburg, 8 August: 12.4 µg/m³, 2.3× usualEllensburg, 9 August: 19.5 µg/m³, 3.5× usualEllensburg, 10 August: 8.5 µg/m³, 1.5× usualEllensburg, 11 August: 8.5 µg/m³, 1.5× usualEllensburg, 12 August: 17.9 µg/m³, 3.3× usualEllensburg, 13 August: 60.6 µg/m³, 11× usualEllensburg, 14 August: 46.2 µg/m³, 8.4× usualThe DallesThe Dalles, 1 August: 2.9 µg/m³, 0.6× usualThe Dalles, 2 August: 3.8 µg/m³, 0.7× usualThe Dalles, 3 August: 28.6 µg/m³, 5.6× usualThe Dalles, 4 August: 58.6 µg/m³, 11× usualThe Dalles, 5 August: 77.3 µg/m³, 15× usualThe Dalles, 6 August: 83.8 µg/m³, 16× usualThe Dalles, 7 August: 19.3 µg/m³, 3.8× usualThe Dalles, 8 August: 11.2 µg/m³, 2.2× usualThe Dalles, 9 August: 5.0 µg/m³, 1.0× usualThe Dalles, 10 August: 5.3 µg/m³, 1.0× usualThe Dalles, 11 August: 5.8 µg/m³, 1.1× usualThe Dalles, 12 August: 5.1 µg/m³, 1.0× usualThe Dalles, 13 August: 22.8 µg/m³, 4.5× usualThe Dalles, 14 August: 28.6 µg/m³, 5.6× usualSunnysideSunnyside, 1 August: 9.4 µg/m³, 1.2× usualSunnyside, 2 August: 4.3 µg/m³, 0.6× usualSunnyside, 3 August: 37.1 µg/m³, 4.8× usualSunnyside, 4 August: 76.8 µg/m³, 10.0× usualSunnyside, 5 August: 67.0 µg/m³, 8.7× usualSunnyside, 6 August: 49.6 µg/m³, 6.4× usualSunnyside, 7 August: 26.8 µg/m³, 3.5× usualSunnyside, 8 August: 10.8 µg/m³, 1.4× usualSunnyside, 9 August: 10.6 µg/m³, 1.4× usualSunnyside, 10 August: 7.6 µg/m³, 1.0× usualSunnyside, 11 August: 6.9 µg/m³, 0.9× usualSunnyside, 12 August: 21.2 µg/m³, 2.8× usualSunnyside, 13 August: 33.9 µg/m³, 4.4× usualSunnyside, 14 August: 21.8 µg/m³, 2.8× usualPascoPasco, 1 August: no readingPasco, 2 August: no readingPasco, 3 August: 26.7 µg/m³, 5.3× usualPasco, 4 August: 71.3 µg/m³, 14× usualPasco, 5 August: 62.7 µg/m³, 13× usualPasco, 6 August: 63.3 µg/m³, 13× usualPasco, 7 August: 32.3 µg/m³, 6.5× usualPasco, 8 August: 19.0 µg/m³, 3.8× usualPasco, 9 August: 11.8 µg/m³, 2.4× usualPasco, 10 August: 6.1 µg/m³, 1.2× usualPasco, 11 August: 5.7 µg/m³, 1.1× usualPasco, 12 August: 17.4 µg/m³, 3.5× usualPasco, 13 August: 26.1 µg/m³, 5.2× usualPasco, 14 August: 13.2 µg/m³, 2.6× usualTri-CitiesTri-Cities, 1 August: 8.7 µg/m³, 1.4× usualTri-Cities, 2 August: 2.9 µg/m³, 0.5× usualTri-Cities, 3 August: 32.4 µg/m³, 5.2× usualTri-Cities, 4 August: 70.6 µg/m³, 11× usualTri-Cities, 5 August: 65.0 µg/m³, 10× usualTri-Cities, 6 August: 58.3 µg/m³, 9.4× usualTri-Cities, 7 August: 33.0 µg/m³, 5.3× usualTri-Cities, 8 August: 23.0 µg/m³, 3.7× usualTri-Cities, 9 August: 13.9 µg/m³, 2.2× usualTri-Cities, 10 August: 6.7 µg/m³, 1.1× usualTri-Cities, 11 August: 5.4 µg/m³, 0.9× usualTri-Cities, 12 August: 18.5 µg/m³, 3.0× usualTri-Cities, 13 August: 27.8 µg/m³, 4.5× usualTri-Cities, 14 August: 11.8 µg/m³, 1.9× usualRedmondRedmond, 1 August: 2.7 µg/m³, 0.2× usualRedmond, 2 August: 3.0 µg/m³, 0.3× usualRedmond, 3 August: 29.1 µg/m³, 2.6× usualRedmond, 4 August: 69.8 µg/m³, 6.1× usualRedmond, 5 August: 62.0 µg/m³, 5.4× usualRedmond, 6 August: 37.9 µg/m³, 3.3× usualRedmond, 7 August: 21.4 µg/m³, 1.9× usualRedmond, 8 August: 14.2 µg/m³, 1.2× usualRedmond, 9 August: 13.3 µg/m³, 1.2× usualRedmond, 10 August: 34.2 µg/m³, 3.0× usualRedmond, 11 August: 34.7 µg/m³, 3.0× usualRedmond, 12 August: 16.7 µg/m³, 1.5× usualRedmond, 13 August: 25.9 µg/m³, 2.3× usualRedmond, 14 August: 25.0 µg/m³, 2.2× usualBozemanBozeman, 1 August: 10.9 µg/m³, 1.4× usualBozeman, 2 August: 24.4 µg/m³, 3.1× usualBozeman, 3 August: 28.5 µg/m³, 3.6× usualBozeman, 4 August: 12.5 µg/m³, 1.6× usualBozeman, 5 August: 15.4 µg/m³, 1.9× usualBozeman, 6 August: 31.0 µg/m³, 3.9× usualBozeman, 7 August: 44.8 µg/m³, 5.7× usualBozeman, 8 August: 65.0 µg/m³, 8.2× usualBozeman, 9 August: 45.7 µg/m³, 5.8× usualBozeman, 10 August: 61.0 µg/m³, 7.7× usualBozeman, 11 August: 42.8 µg/m³, 5.4× usualBozeman, 12 August: 26.0 µg/m³, 3.3× usualBozeman, 13 August: 13.1 µg/m³, 1.7× usualBozeman, 14 August: 5.3 µg/m³, 0.7× usualButteButte, 1 August: 20.6 µg/m³, 2.9× usualButte, 2 August: 22.3 µg/m³, 3.1× usualButte, 3 August: 30.6 µg/m³, 4.3× usualButte, 4 August: 16.6 µg/m³, 2.3× usualButte, 5 August: 22.9 µg/m³, 3.2× usualButte, 6 August: 30.6 µg/m³, 4.3× usualButte, 7 August: 59.8 µg/m³, 8.3× usualButte, 8 August: 57.6 µg/m³, 8.0× usualButte, 9 August: 36.1 µg/m³, 5.0× usualButte, 10 August: 33.3 µg/m³, 4.6× usualButte, 11 August: 32.3 µg/m³, 4.5× usualButte, 12 August: 25.5 µg/m³, 3.5× usualButte, 13 August: 12.1 µg/m³, 1.7× usualButte, 14 August: 4.8 µg/m³, 0.7× usualPullmanPullman, 1 August: 15.1 µg/m³, 1.9× usualPullman, 2 August: 9.1 µg/m³, 1.1× usualPullman, 3 August: 38.8 µg/m³, 4.8× usualPullman, 4 August: 41.0 µg/m³, 5.1× usualPullman, 5 August: 29.5 µg/m³, 3.6× usualPullman, 6 August: 52.8 µg/m³, 6.5× usualPullman, 7 August: 52.6 µg/m³, 6.5× usualPullman, 8 August: 24.8 µg/m³, 3.1× usualPullman, 9 August: 20.2 µg/m³, 2.5× usualPullman, 10 August: 15.0 µg/m³, 1.9× usualPullman, 11 August: 12.5 µg/m³, 1.5× usualPullman, 12 August: 10.6 µg/m³, 1.3× usualPullman, 13 August: 24.7 µg/m³, 3.0× usualPullman, 14 August: 13.6 µg/m³, 1.7× usualMoscowMoscow, 1 August: 16.5 µg/m³, 1.7× usualMoscow, 2 August: 7.7 µg/m³, 0.8× usualMoscow, 3 August: 41.5 µg/m³, 4.2× usualMoscow, 4 August: 40.0 µg/m³, 4.1× usualMoscow, 5 August: 27.4 µg/m³, 2.8× usualMoscow, 6 August: 43.4 µg/m³, 4.4× usualMoscow, 7 August: 46.5 µg/m³, 4.7× usualMoscow, 8 August: 19.1 µg/m³, 1.9× usualMoscow, 9 August: 29.9 µg/m³, 3.1× usualMoscow, 10 August: 15.6 µg/m³, 1.6× usualMoscow, 11 August: 12.3 µg/m³, 1.3× usualMoscow, 12 August: 15.9 µg/m³, 1.6× usualMoscow, 13 August: 24.3 µg/m³, 2.5× usualMoscow, 14 August: 13.8 µg/m³, 1.4× usualEugeneEugene, 1 August: 1.8 µg/m³, 0.4× usualEugene, 2 August: 3.2 µg/m³, 0.6× usualEugene, 3 August: 17.5 µg/m³, 3.5× usualEugene, 4 August: 56.4 µg/m³, 11× usualEugene, 5 August: 120.0 µg/m³, 24× usualEugene, 6 August: 85.2 µg/m³, 17× usualEugene, 7 August: 19.5 µg/m³, 3.9× usualEugene, 8 August: 9.9 µg/m³, 2.0× usualEugene, 9 August: 2.9 µg/m³, 0.6× usualEugene, 10 August: 3.3 µg/m³, 0.7× usualEugene, 11 August: 3.2 µg/m³, 0.6× usualEugene, 12 August: 2.3 µg/m³, 0.5× usualEugene, 13 August: 7.6 µg/m³, 1.5× usualEugene, 14 August: 5.9 µg/m³, 1.2× usualOregon CityOregon City, 1 August: 2.0 µg/m³, 0.4× usualOregon City, 2 August: 3.0 µg/m³, 0.6× usualOregon City, 3 August: 17.2 µg/m³, 3.4× usualOregon City, 4 August: 70.5 µg/m³, 14× usualOregon City, 5 August: 86.2 µg/m³, 17× usualOregon City, 6 August: 52.2 µg/m³, 10× usualOregon City, 7 August: 13.4 µg/m³, 2.7× usualOregon City, 8 August: 4.6 µg/m³, 0.9× usualOregon City, 9 August: 2.8 µg/m³, 0.6× usualOregon City, 10 August: 2.6 µg/m³, 0.5× usualOregon City, 11 August: 2.2 µg/m³, 0.4× usualOregon City, 12 August: 2.2 µg/m³, 0.4× usualOregon City, 13 August: 7.3 µg/m³, 1.5× usualOregon City, 14 August: 6.3 µg/m³, 1.3× usualCanbyCanby, 1 August: 2.2 µg/m³, 0.4× usualCanby, 2 August: 3.6 µg/m³, 0.7× usualCanby, 3 August: 17.6 µg/m³, 3.5× usualCanby, 4 August: 66.1 µg/m³, 13× usualCanby, 5 August: 86.1 µg/m³, 17× usualCanby, 6 August: 45.7 µg/m³, 9.1× usualCanby, 7 August: 17.9 µg/m³, 3.6× usualCanby, 8 August: 5.9 µg/m³, 1.2× usualCanby, 9 August: 3.7 µg/m³, 0.7× usualCanby, 10 August: 3.6 µg/m³, 0.7× usualCanby, 11 August: 2.8 µg/m³, 0.6× usualCanby, 12 August: 2.9 µg/m³, 0.6× usualCanby, 13 August: 11.5 µg/m³, 2.3× usualCanby, 14 August: 9.3 µg/m³, 1.9× usualAlbanyAlbany, 1 August: 2.0 µg/m³, 0.4× usualAlbany, 2 August: 3.3 µg/m³, 0.7× usualAlbany, 3 August: 19.2 µg/m³, 3.8× usualAlbany, 4 August: 58.8 µg/m³, 12× usualAlbany, 5 August: 83.3 µg/m³, 17× usualAlbany, 6 August: 55.8 µg/m³, 11× usualAlbany, 7 August: 14.3 µg/m³, 2.9× usualAlbany, 8 August: 6.5 µg/m³, 1.3× usualAlbany, 9 August: 3.0 µg/m³, 0.6× usualAlbany, 10 August: 3.1 µg/m³, 0.6× usualAlbany, 11 August: 2.6 µg/m³, 0.5× usualAlbany, 12 August: 2.1 µg/m³, 0.4× usualAlbany, 13 August: 6.0 µg/m³, 1.2× usualAlbany, 14 August: 5.6 µg/m³, 1.1× usualChilliwackChilliwack, 1 August: 2.7 µg/m³, 0.5× usualChilliwack, 2 August: 3.0 µg/m³, 0.5× usualChilliwack, 3 August: 14.5 µg/m³, 2.4× usualChilliwack, 4 August: 52.1 µg/m³, 8.7× usualChilliwack, 5 August: 81.5 µg/m³, 14× usualChilliwack, 6 August: 51.5 µg/m³, 8.6× usualChilliwack, 7 August: 19.9 µg/m³, 3.3× usualChilliwack, 8 August: 9.5 µg/m³, 1.6× usualChilliwack, 9 August: 5.7 µg/m³, 1.0× usualChilliwack, 10 August: 6.0 µg/m³, 1.0× usualChilliwack, 11 August: 4.7 µg/m³, 0.8× usualChilliwack, 12 August: 6.5 µg/m³, 1.1× usualChilliwack, 13 August: 21.9 µg/m³, 3.7× usualChilliwack, 14 August: 33.5 µg/m³, 5.6× usualGreshamGresham, 1 August: 2.6 µg/m³, 0.5× usualGresham, 2 August: 3.7 µg/m³, 0.7× usualGresham, 3 August: 15.0 µg/m³, 3.0× usualGresham, 4 August: 54.4 µg/m³, 11× usualGresham, 5 August: 79.9 µg/m³, 16× usualGresham, 6 August: 37.4 µg/m³, 7.5× usualGresham, 7 August: 12.3 µg/m³, 2.5× usualGresham, 8 August: 5.3 µg/m³, 1.1× usualGresham, 9 August: 3.6 µg/m³, 0.7× usualGresham, 10 August: 3.5 µg/m³, 0.7× usualGresham, 11 August: 3.3 µg/m³, 0.7× usualGresham, 12 August: 2.6 µg/m³, 0.5× usualGresham, 13 August: 8.4 µg/m³, 1.7× usualGresham, 14 August: 7.9 µg/m³, 1.6× usualUnion Hill-Novelty …Union Hill-Novelty Hill, 1 August: no readingUnion Hill-Novelty Hill, 2 August: 0.1 µg/m³, 0.0× usualUnion Hill-Novelty Hill, 3 August: 7.0 µg/m³, 1.3× usualUnion Hill-Novelty Hill, 4 August: 43.1 µg/m³, 8.0× usualUnion Hill-Novelty Hill, 5 August: 75.6 µg/m³, 14× usualUnion Hill-Novelty Hill, 6 August: 64.0 µg/m³, 12× usualUnion Hill-Novelty Hill, 7 August: 37.8 µg/m³, 7.0× usualUnion Hill-Novelty Hill, 8 August: 12.1 µg/m³, 2.2× usualUnion Hill-Novelty Hill, 9 August: 0.7 µg/m³, 0.1× usualUnion Hill-Novelty Hill, 10 August: 2.2 µg/m³, 0.4× usualUnion Hill-Novelty Hill, 11 August: 0.1 µg/m³, 0.0× usualUnion Hill-Novelty Hill, 12 August: 4.2 µg/m³, 0.8× usualUnion Hill-Novelty Hill, 13 August: 17.1 µg/m³, 3.2× usualUnion Hill-Novelty Hill, 14 August: 22.7 µg/m³, 4.2× usualNorth CreekNorth Creek, 1 August: 0.5 µg/m³, 0.1× usualNorth Creek, 2 August: 0.9 µg/m³, 0.2× usualNorth Creek, 3 August: 6.1 µg/m³, 1.2× usualNorth Creek, 4 August: 39.6 µg/m³, 7.9× usualNorth Creek, 5 August: 68.4 µg/m³, 14× usualNorth Creek, 6 August: 53.8 µg/m³, 11× usualNorth Creek, 7 August: 34.8 µg/m³, 7.0× usualNorth Creek, 8 August: 3.3 µg/m³, 0.7× usualNorth Creek, 9 August: 1.3 µg/m³, 0.3× usualNorth Creek, 10 August: 2.4 µg/m³, 0.5× usualNorth Creek, 11 August: no readingNorth Creek, 12 August: 4.4 µg/m³, 0.9× usualNorth Creek, 13 August: 15.1 µg/m³, 3.0× usualNorth Creek, 14 August: 14.8 µg/m³, 3.0× usualCorvallisCorvallis, 1 August: 1.8 µg/m³, 0.4× usualCorvallis, 2 August: 2.4 µg/m³, 0.5× usualCorvallis, 3 August: 16.9 µg/m³, 3.4× usualCorvallis, 4 August: 64.9 µg/m³, 13× usualCorvallis, 5 August: 66.7 µg/m³, 13× usualCorvallis, 6 August: 33.1 µg/m³, 6.6× usualCorvallis, 7 August: 9.1 µg/m³, 1.8× usualCorvallis, 8 August: 5.4 µg/m³, 1.1× usualCorvallis, 9 August: 2.1 µg/m³, 0.4× usualCorvallis, 10 August: 2.2 µg/m³, 0.4× usualCorvallis, 11 August: 2.0 µg/m³, 0.4× usualCorvallis, 12 August: no readingCorvallis, 13 August: 3.7 µg/m³, 0.7× usualCorvallis, 14 August: 3.2 µg/m³, 0.6× usualHermistonHermiston, 1 August: 5.8 µg/m³, 0.8× usualHermiston, 2 August: 5.3 µg/m³, 0.7× usualHermiston, 3 August: 22.8 µg/m³, 3.0× usualHermiston, 4 August: 60.4 µg/m³, 7.8× usualHermiston, 5 August: 64.9 µg/m³, 8.4× usualHermiston, 6 August: 66.1 µg/m³, 8.6× usualHermiston, 7 August: 34.4 µg/m³, 4.5× usualHermiston, 8 August: 14.1 µg/m³, 1.8× usualHermiston, 9 August: 5.8 µg/m³, 0.8× usualHermiston, 10 August: 7.1 µg/m³, 0.9× usualHermiston, 11 August: 5.0 µg/m³, 0.6× usualHermiston, 12 August: 5.7 µg/m³, 0.7× usualHermiston, 13 August: 21.5 µg/m³, 2.8× usualHermiston, 14 August: 19.1 µg/m³, 2.5× usualSalemSalem, 1 August: 1.9 µg/m³, 0.4× usualSalem, 2 August: 3.0 µg/m³, 0.6× usualSalem, 3 August: 21.1 µg/m³, 4.2× usualSalem, 4 August: 61.2 µg/m³, 12× usualSalem, 5 August: 64.4 µg/m³, 13× usualSalem, 6 August: 33.4 µg/m³, 6.7× usualSalem, 7 August: 11.2 µg/m³, 2.2× usualSalem, 8 August: 7.2 µg/m³, 1.4× usualSalem, 9 August: 2.9 µg/m³, 0.6× usualSalem, 10 August: 2.9 µg/m³, 0.6× usualSalem, 11 August: 2.9 µg/m³, 0.6× usualSalem, 12 August: 2.1 µg/m³, 0.4× usualSalem, 13 August: 6.7 µg/m³, 1.3× usualSalem, 14 August: 6.4 µg/m³, 1.3× usualBendBend, 1 August: 3.2 µg/m³, 0.3× usualBend, 2 August: 3.1 µg/m³, 0.3× usualBend, 3 August: 18.8 µg/m³, 2.0× usualBend, 4 August: 64.1 µg/m³, 6.7× usualBend, 5 August: 50.1 µg/m³, 5.2× usualBend, 6 August: 24.9 µg/m³, 2.6× usualBend, 7 August: 18.0 µg/m³, 1.9× usualBend, 8 August: 12.3 µg/m³, 1.3× usualBend, 9 August: 4.7 µg/m³, 0.5× usualBend, 10 August: 23.7 µg/m³, 2.5× usualBend, 11 August: 23.3 µg/m³, 2.4× usualBend, 12 August: 6.5 µg/m³, 0.7× usualBend, 13 August: 25.4 µg/m³, 2.6× usualBend, 14 August: 18.3 µg/m³, 1.9× usualBeavertonBeaverton, 1 August: 2.0 µg/m³, 0.4× usualBeaverton, 2 August: 3.4 µg/m³, 0.7× usualBeaverton, 3 August: 21.0 µg/m³, 4.2× usualBeaverton, 4 August: 50.8 µg/m³, 10× usualBeaverton, 5 August: 61.8 µg/m³, 12× usualBeaverton, 6 August: 35.5 µg/m³, 7.1× usualBeaverton, 7 August: 14.7 µg/m³, 2.9× usualBeaverton, 8 August: 6.6 µg/m³, 1.3× usualBeaverton, 9 August: 3.1 µg/m³, 0.6× usualBeaverton, 10 August: 3.1 µg/m³, 0.6× usualBeaverton, 11 August: 2.4 µg/m³, 0.5× usualBeaverton, 12 August: 2.2 µg/m³, 0.4× usualBeaverton, 13 August: 8.3 µg/m³, 1.7× usualBeaverton, 14 August: 8.3 µg/m³, 1.7× usualDallasDallas, 1 August: 1.1 µg/m³, 0.2× usualDallas, 2 August: 2.0 µg/m³, 0.4× usualDallas, 3 August: 19.6 µg/m³, 3.9× usualDallas, 4 August: 60.3 µg/m³, 12× usualDallas, 5 August: 57.7 µg/m³, 12× usualDallas, 6 August: 42.4 µg/m³, 8.5× usualDallas, 7 August: 10.4 µg/m³, 2.1× usualDallas, 8 August: 4.8 µg/m³, 1.0× usualDallas, 9 August: 1.4 µg/m³, 0.3× usualDallas, 10 August: 1.7 µg/m³, 0.3× usualDallas, 11 August: 1.4 µg/m³, 0.3× usualDallas, 12 August: 1.0 µg/m³, 0.2× usualDallas, 13 August: 5.3 µg/m³, 1.1× usualDallas, 14 August: 4.8 µg/m³, 1.0× usualTigardTigard, 1 August: 2.5 µg/m³, 0.5× usualTigard, 2 August: 4.1 µg/m³, 0.8× usualTigard, 3 August: 18.8 µg/m³, 3.5× usualTigard, 4 August: 47.2 µg/m³, 8.9× usualTigard, 5 August: 59.5 µg/m³, 11× usualTigard, 6 August: 45.3 µg/m³, 8.5× usualTigard, 7 August: 19.5 µg/m³, 3.7× usualTigard, 8 August: 8.2 µg/m³, 1.5× usualTigard, 9 August: 4.0 µg/m³, 0.8× usualTigard, 10 August: 4.0 µg/m³, 0.8× usualTigard, 11 August: 3.1 µg/m³, 0.6× usualTigard, 12 August: 3.1 µg/m³, 0.6× usualTigard, 13 August: 10.9 µg/m³, 2.1× usualTigard, 14 August: 11.0 µg/m³, 2.1× usualWoodburnWoodburn, 1 August: 1.8 µg/m³, 0.4× usualWoodburn, 2 August: 2.4 µg/m³, 0.5× usualWoodburn, 3 August: 16.7 µg/m³, 3.3× usualWoodburn, 4 August: 50.2 µg/m³, 10× usualWoodburn, 5 August: 57.8 µg/m³, 12× usualWoodburn, 6 August: 39.6 µg/m³, 7.9× usualWoodburn, 7 August: 9.8 µg/m³, 2.0× usualWoodburn, 8 August: 5.3 µg/m³, 1.1× usualWoodburn, 9 August: 2.3 µg/m³, 0.5× usualWoodburn, 10 August: 2.2 µg/m³, 0.4× usualWoodburn, 11 August: 1.9 µg/m³, 0.4× usualWoodburn, 12 August: 1.8 µg/m³, 0.4× usualWoodburn, 13 August: 5.9 µg/m³, 1.2× usualWoodburn, 14 August: 4.9 µg/m³, 1.0× usualKirklandKirkland, 1 August: no readingKirkland, 2 August: no readingKirkland, 3 August: 8.9 µg/m³, 1.8× usualKirkland, 4 August: 46.5 µg/m³, 9.3× usualKirkland, 5 August: 56.7 µg/m³, 11× usualKirkland, 6 August: 52.2 µg/m³, 10× usualKirkland, 7 August: 34.2 µg/m³, 6.8× usualKirkland, 8 August: 7.1 µg/m³, 1.4× usualKirkland, 9 August: 0.9 µg/m³, 0.2× usualKirkland, 10 August: 1.5 µg/m³, 0.3× usualKirkland, 11 August: 0.0 µg/m³, 0.0× usualKirkland, 12 August: 3.9 µg/m³, 0.8× usualKirkland, 13 August: 12.5 µg/m³, 2.5× usualKirkland, 14 August: 13.2 µg/m³, 2.6× usualMcMinnvilleMcMinnville, 1 August: 1.6 µg/m³, 0.3× usualMcMinnville, 2 August: 1.7 µg/m³, 0.3× usualMcMinnville, 3 August: 8.9 µg/m³, 1.8× usualMcMinnville, 4 August: 35.7 µg/m³, 7.1× usualMcMinnville, 5 August: 54.1 µg/m³, 11× usualMcMinnville, 6 August: 28.9 µg/m³, 5.8× usualMcMinnville, 7 August: 9.1 µg/m³, 1.8× usualMcMinnville, 8 August: 7.1 µg/m³, 1.4× usualMcMinnville, 9 August: 2.7 µg/m³, 0.5× usualMcMinnville, 10 August: 2.7 µg/m³, 0.5× usualMcMinnville, 11 August: 2.4 µg/m³, 0.5× usualMcMinnville, 12 August: 2.0 µg/m³, 0.4× usualMcMinnville, 13 August: 7.4 µg/m³, 1.5× usualMcMinnville, 14 August: 4.8 µg/m³, 1.0× usualPortlandPortland, 1 August: 2.0 µg/m³, 0.4× usualPortland, 2 August: 3.3 µg/m³, 0.7× usualPortland, 3 August: 17.1 µg/m³, 3.4× usualPortland, 4 August: 40.7 µg/m³, 8.1× usualPortland, 5 August: 53.0 µg/m³, 11× usualPortland, 6 August: 27.1 µg/m³, 5.4× usualPortland, 7 August: 11.5 µg/m³, 2.3× usualPortland, 8 August: 4.6 µg/m³, 0.9× usualPortland, 9 August: 3.3 µg/m³, 0.7× usualPortland, 10 August: 3.4 µg/m³, 0.7× usualPortland, 11 August: 2.7 µg/m³, 0.5× usualPortland, 12 August: 2.6 µg/m³, 0.5× usualPortland, 13 August: 7.5 µg/m³, 1.5× usualPortland, 14 August: 7.8 µg/m³, 1.6× usualBothellBothell, 1 August: no readingBothell, 2 August: 0.9 µg/m³, 0.2× usualBothell, 3 August: 5.9 µg/m³, 1.2× usualBothell, 4 August: 33.7 µg/m³, 6.7× usualBothell, 5 August: 51.5 µg/m³, 10× usualBothell, 6 August: 49.7 µg/m³, 9.9× usualBothell, 7 August: 33.6 µg/m³, 6.7× usualBothell, 8 August: 6.2 µg/m³, 1.2× usualBothell, 9 August: 1.6 µg/m³, 0.3× usualBothell, 10 August: 3.0 µg/m³, 0.6× usualBothell, 11 August: 0.2 µg/m³, 0.0× usualBothell, 12 August: 6.0 µg/m³, 1.2× usualBothell, 13 August: 16.4 µg/m³, 3.3× usualBothell, 14 August: 17.6 µg/m³, 3.5× usualHillsboroHillsboro, 1 August: 2.1 µg/m³, 0.4× usualHillsboro, 2 August: 3.3 µg/m³, 0.7× usualHillsboro, 3 August: 23.4 µg/m³, 4.7× usualHillsboro, 4 August: 47.7 µg/m³, 9.5× usualHillsboro, 5 August: 50.8 µg/m³, 10× usualHillsboro, 6 August: 31.1 µg/m³, 6.2× usualHillsboro, 7 August: 12.2 µg/m³, 2.4× usualHillsboro, 8 August: 5.5 µg/m³, 1.1× usualHillsboro, 9 August: 2.8 µg/m³, 0.6× usualHillsboro, 10 August: 2.9 µg/m³, 0.6× usualHillsboro, 11 August: 2.1 µg/m³, 0.4× usualHillsboro, 12 August: 2.0 µg/m³, 0.4× usualHillsboro, 13 August: 8.9 µg/m³, 1.8× usualHillsboro, 14 August: 6.7 µg/m³, 1.3× usualVancouverVancouver, 1 August: 2.6 µg/m³, 0.5× usualVancouver, 2 August: 4.4 µg/m³, 0.9× usualVancouver, 3 August: 16.8 µg/m³, 3.4× usualVancouver, 4 August: 39.2 µg/m³, 7.8× usualVancouver, 5 August: 48.7 µg/m³, 9.7× usualVancouver, 6 August: 23.9 µg/m³, 4.8× usualVancouver, 7 August: 10.4 µg/m³, 2.1× usualVancouver, 8 August: 5.0 µg/m³, 1.0× usualVancouver, 9 August: 4.0 µg/m³, 0.8× usualVancouver, 10 August: 3.5 µg/m³, 0.7× usualVancouver, 11 August: 2.6 µg/m³, 0.5× usualVancouver, 12 August: 3.3 µg/m³, 0.7× usualVancouver, 13 August: 7.1 µg/m³, 1.4× usualVancouver, 14 August: 6.6 µg/m³, 1.3× usualSalmon CreekSalmon Creek, 1 August: 2.3 µg/m³, 0.5× usualSalmon Creek, 2 August: 3.4 µg/m³, 0.7× usualSalmon Creek, 3 August: 16.5 µg/m³, 3.3× usualSalmon Creek, 4 August: 38.7 µg/m³, 7.7× usualSalmon Creek, 5 August: 46.1 µg/m³, 9.2× usualSalmon Creek, 6 August: 22.7 µg/m³, 4.5× usualSalmon Creek, 7 August: 12.5 µg/m³, 2.5× usualSalmon Creek, 8 August: 4.5 µg/m³, 0.9× usualSalmon Creek, 9 August: 3.6 µg/m³, 0.7× usualSalmon Creek, 10 August: 3.3 µg/m³, 0.7× usualSalmon Creek, 11 August: 2.6 µg/m³, 0.5× usualSalmon Creek, 12 August: 2.5 µg/m³, 0.5× usualSalmon Creek, 13 August: 6.3 µg/m³, 1.3× usualSalmon Creek, 14 August: 5.6 µg/m³, 1.1× usualKelownaKelowna, 1 August: 22.4 µg/m³, 2.8× usualKelowna, 2 August: 3.1 µg/m³, 0.4× usualKelowna, 3 August: 14.8 µg/m³, 1.8× usualKelowna, 4 August: 18.4 µg/m³, 2.3× usualKelowna, 5 August: 39.6 µg/m³, 4.9× usualKelowna, 6 August: 67.1 µg/m³, 8.3× usualKelowna, 7 August: 59.8 µg/m³, 7.4× usualKelowna, 8 August: 20.2 µg/m³, 2.5× usualKelowna, 9 August: 40.8 µg/m³, 5.0× usualKelowna, 10 August: no readingKelowna, 11 August: 94.3 µg/m³, 12× usualKelowna, 12 August: 15.3 µg/m³, 1.9× usualKelowna, 13 August: 16.3 µg/m³, 2.0× usualKelowna, 14 August: 8.4 µg/m³, 1.0× usualAltamontAltamont, 1 August: 5.0 µg/m³, 0.6× usualAltamont, 2 August: 3.5 µg/m³, 0.4× usualAltamont, 3 August: 16.9 µg/m³, 2.2× usualAltamont, 4 August: 23.1 µg/m³, 3.0× usualAltamont, 5 August: 36.9 µg/m³, 4.7× usualAltamont, 6 August: 21.8 µg/m³, 2.8× usualAltamont, 7 August: 23.6 µg/m³, 3.0× usualAltamont, 8 August: 32.3 µg/m³, 4.1× usualAltamont, 9 August: 15.7 µg/m³, 2.0× usualAltamont, 10 August: 64.0 µg/m³, 8.2× usualAltamont, 11 August: 30.8 µg/m³, 3.9× usualAltamont, 12 August: 7.1 µg/m³, 0.9× usualAltamont, 13 August: 8.8 µg/m³, 1.1× usualAltamont, 14 August: 8.7 µg/m³, 1.1× usualAbbotsfordAbbotsford, 1 August: 2.4 µg/m³, 0.5× usualAbbotsford, 2 August: 3.3 µg/m³, 0.6× usualAbbotsford, 3 August: 7.6 µg/m³, 1.5× usualAbbotsford, 4 August: 18.4 µg/m³, 3.6× usualAbbotsford, 5 August: 50.1 µg/m³, 9.8× usualAbbotsford, 6 August: 37.9 µg/m³, 7.4× usualAbbotsford, 7 August: 16.9 µg/m³, 3.3× usualAbbotsford, 8 August: 7.0 µg/m³, 1.4× usualAbbotsford, 9 August: 5.9 µg/m³, 1.2× usualAbbotsford, 10 August: 4.4 µg/m³, 0.9× usualAbbotsford, 11 August: 4.4 µg/m³, 0.9× usualAbbotsford, 12 August: 6.4 µg/m³, 1.3× usualAbbotsford, 13 August: 14.0 µg/m³, 2.7× usualAbbotsford, 14 August: 13.1 µg/m³, 2.6× usualInglewood-Finn HillInglewood-Finn Hill, 1 August: no readingInglewood-Finn Hill, 2 August: no readingInglewood-Finn Hill, 3 August: no readingInglewood-Finn Hill, 4 August: no readingInglewood-Finn Hill, 5 August: 49.2 µg/m³, 9.8× usualInglewood-Finn Hill, 6 August: 49.0 µg/m³, 9.8× usualInglewood-Finn Hill, 7 August: 34.1 µg/m³, 6.8× usualInglewood-Finn Hill, 8 August: 9.7 µg/m³, 1.9× usualInglewood-Finn Hill, 9 August: 3.0 µg/m³, 0.6× usualInglewood-Finn Hill, 10 August: 4.7 µg/m³, 0.9× usualInglewood-Finn Hill, 11 August: 1.4 µg/m³, 0.3× usualInglewood-Finn Hill, 12 August: 4.6 µg/m³, 0.9× usualInglewood-Finn Hill, 13 August: 14.4 µg/m³, 2.9× usualInglewood-Finn Hill, 14 August: 14.9 µg/m³, 3.0× usualCoquitlamCoquitlam, 1 August: 2.5 µg/m³, 0.5× usualCoquitlam, 2 August: 3.1 µg/m³, 0.6× usualCoquitlam, 3 August: 3.2 µg/m³, 0.6× usualCoquitlam, 4 August: 9.7 µg/m³, 1.8× usualCoquitlam, 5 August: 46.9 µg/m³, 8.5× usualCoquitlam, 6 August: 37.5 µg/m³, 6.8× usualCoquitlam, 7 August: 14.8 µg/m³, 2.7× usualCoquitlam, 8 August: 8.2 µg/m³, 1.5× usualCoquitlam, 9 August: 5.5 µg/m³, 1.0× usualCoquitlam, 10 August: 4.5 µg/m³, 0.8× usualCoquitlam, 11 August: 4.0 µg/m³, 0.7× usualCoquitlam, 12 August: 5.6 µg/m³, 1.0× usualCoquitlam, 13 August: 9.7 µg/m³, 1.8× usualCoquitlam, 14 August: 15.8 µg/m³, 2.9× usual1 Aug35791113
The 60 cities with the highest readings of 99, 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
WenatcheeWashington, United States4 204.04 August5.041×
EugeneOregon, United States3 120.05 August4.424×
YakimaWashington, United States4 100.04 August5.817×
Oregon CityOregon, United States3 86.25 August3.517×
CanbyOregon, United States3 86.15 August4.117×
KamloopsBritish Columbia, Canada6 191.07 August11.217×
AlbanyOregon, United States3 83.35 August3.617×
The DallesOregon, United States3 83.86 August5.116×
GreshamOregon, United States3 79.95 August3.516×
VernonBritish Columbia, Canada5 142.010 August9.116×
EllensburgWashington, United States3 84.04 August5.515×
Walla WallaWashington, United States4 108.05 August7.215×
PascoWashington, United States4 71.34 August4.714×
Union Hill-Novelty HillWashington, United States3 75.65 August5.414×
North CreekWashington, United States4 68.45 August4.714×
ChilliwackBritish Columbia, Canada3 81.55 August6.014×
CorvallisOregon, United States3 66.75 August3.113×
SalemOregon, United States3 64.45 August3.713×
BeavertonOregon, United States3 61.85 August3.712×
DallasOregon, United States3 60.34 August2.512×
KelownaBritish Columbia, Canada4 94.311 August8.112×
Moses LakeWashington, United States6 87.19 August7.512×
WoodburnOregon, United States3 57.85 August2.912×
Tri-CitiesWashington, United States4 70.64 August6.211×
KirklandWashington, United States4 56.75 August3.911×
TigardOregon, United States3 59.55 August5.311×
McMinnvilleOregon, United States3 54.15 August2.711×
PendletonOregon, United States5 86.35 August8.011×
PortlandOregon, United States3 53.05 August3.811×
Spokane ValleyWashington, United States6 95.63 August9.111×
BothellWashington, United States4 51.55 August4.110×
CranbrookBritish Columbia, Canada5 93.49 August9.110×
HillsboroOregon, United States3 50.85 August4.010×
SpokaneWashington, United States6 93.13 August9.210×
SunnysideWashington, United States4 76.84 August7.710.0×
Inglewood-Finn HillWashington, United States3 49.25 August4.29.8×
AbbotsfordBritish Columbia, Canada2 50.15 August5.19.8×
VancouverWashington, United States2 48.75 August3.39.7×
Salmon CreekWashington, United States2 46.15 August4.39.2×
CentraliaWashington, United States2 43.25 August4.08.6×
HermistonOregon, United States4 66.16 August7.78.6×
CoquitlamBritish Columbia, Canada2 46.95 August5.58.5×
Twin FallsIdaho, United States7 56.14 August6.68.5×
PocatelloIdaho, United States1 49.32 August5.88.5×
ParklandWashington, United States3 42.45 August3.78.5×
ButteMontana, United States4 59.87 August7.28.3×
MilwaukieOregon, United States2 41.25 August3.78.2×
BozemanMontana, United States4 65.08 August7.98.2×
KentWashington, United States3 41.15 August4.48.2×
AltamontOregon, United States1 64.010 August7.88.2×
AuburnWashington, United States4 44.55 August5.58.1×
NampaIdaho, United States8 77.57 August9.68.1×
BellevueWashington, United States3 38.35 August4.37.7×
Idaho FallsIdaho, United States1 44.92 August5.97.6×
Coeur d'AleneIdaho, United States5 76.03 August10.07.6×
MissoulaMontana, United States4 55.110 August7.37.5×
BoiseIdaho, United States8 54.82 August7.37.5×
Forest GroveOregon, United States2 37.55 August2.77.5×
RentonWashington, United States2 36.76 August5.07.3×
TacomaWashington, United States3 36.65 August4.97.3×
North VancouverBritish Columbia, Canada2 36.55 August4.57.3×
Port CoquitlamBritish Columbia, Canada2 36.25 August4.97.2×
BurienWashington, United States2 35.46 August3.77.1×
MeridianIdaho, United States8 59.23 August8.47.0×
LongviewWashington, United States2 34.25 August4.16.8×
LangleyBritish Columbia, Canada2 34.25 August4.66.8×
BendOregon, United States2 64.14 August9.66.7×
PullmanWashington, United States4 52.86 August8.16.5×
West VancouverBritish Columbia, Canada2 32.35 August4.96.5×
Grants PassOregon, United States2 32.25 August4.86.4×
ShorelineWashington, United States2 32.26 August4.96.4×
LaceyWashington, United States1 31.25 August3.16.2×
RedmondOregon, United States3 69.84 August11.46.1×
BurnabyBritish Columbia, Canada1 31.15 August5.16.1×
Picnic Point-North LynnwoodWashington, United States1 34.05 August5.76.0×
BremertonWashington, United States1 29.56 August4.05.9×
RoseburgOregon, United States2 29.35 August3.45.9×
Strawberry HillBritish Columbia, Canada1 28.55 August4.75.7×
BillingsMontana, United States2 41.48 August7.35.7×
MarysvilleWashington, United States1 27.25 August3.25.4×
Columbia CityWashington, United States2 35.96 August6.75.4×
SheridanWyoming, United States3 36.88 August6.95.3×
Port AlberniBritish Columbia, Canada1 26.56 August3.85.3×
SquamishBritish Columbia, Canada2 35.96 August6.85.3×
GilletteWyoming, United States2 35.23 August6.85.2×
SeattleWashington, United States2 27.56 August5.45.1×
LewistonIdaho, United States5 51.97 August10.64.9×
BellinghamWashington, United States1 26.76 August5.54.9×
MoscowIdaho, United States5 46.57 August9.84.7×
AshlandOregon, United States1 31.57 August6.94.6×
West JordanUtah, United States1 35.93 August8.04.5×
AirdrieAlberta, Canada1 48.21 August10.84.5×
HelenaMontana, United States4 39.56 August8.94.4×
MedfordOregon, United States1 30.47 August6.94.4×
CalgaryAlberta, Canada1 52.41 August13.24.0×
Brigham CityUtah, United States1 26.75 August7.43.6×
TooeleUtah, United States1 25.15 August7.13.5×
Great FallsMontana, United States3 44.510 August13.33.3×
MillcreekUtah, United States1 25.45 August8.82.9×

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 11 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-western United States and Canada, August 2026: 99 cities with PM2.5 at twice their usual or more, 4 to 11 August 2026, smogrank.com/episodes/2026-08-north-western-united-states-and-canada (accessed 2 October 2026).

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

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