SmogRank / Countries / United States / May 2024
Most polluted cities in United States, May 2024
620 cities in United States ranked by their average PM2.5 over the 31 days. Worst: Mission at 36.3 µg/m³, #18 of 2,082 cities in the world. Cleanest: Ellensburg at 0.9. A city needs measurements on 70% of the days to be ranked.
- 1MissionTexas 36.3
- 2EdinburgTexas 30.9
- 3BrownsvilleTexas 28.4
- 4Corpus ChristiTexas 27.1
- 5LaredoTexas 25.2
- 6Live OakTexas 23.1
- 7Eagle PassTexas 21.5
- 8AustinTexas 18.7
- 9San AntonioTexas 18.2
- 10HoustonTexas 17.6
- 11Missouri CityTexas 17.4
- 12Mission BendTexas 17.1
- 13ConroeTexas 17.0
- 14San MarcosTexas 16.5
- 15SaginawTexas 15.9
- 16BaytownTexas 15.3
- 17FontanaCalifornia 15.0
- 18College StationTexas 14.7
- 18PasadenaTexas 14.7
- 20DallasTexas 14.5
- 20TaylorTexas 14.5
- 22La Crescenta-Montroselow-cost sensorsCalifornia 14.3
- 23CorsicanaTexas 14.2
- 24Port ArthurTexas 13.7
- 25TexarkanaTexas 13.6
- 26Santa ClaritaCalifornia 12.9
- 27ShreveportLouisiana 12.8
- 27Fort WorthTexas 12.8
- 27Los AngelesCalifornia 12.8
- 30La PorteTexas 12.4
- 30IndioCalifornia 12.4
- 32Belle GladeFlorida 12.3
- 33Little RockArkansas 12.0
- 34SulphurLouisiana 11.7
- 34Jurupa ValleyCalifornia 11.7
- 36BirminghamAlabama 11.5
- 36LafayetteLouisiana 11.5
- 38GalvestonTexas 11.2
- 38BrawleyCalifornia 11.2
- 40Fort LauderdaleFlorida 11.1
- 40Simi ValleyCalifornia 11.1
- 42LawrencevilleGeorgia 11.0
- 42Baton RougeLouisiana 11.0
- 42BerkeleyCalifornia 11.0
- 42BurbankCalifornia 11.0
- 46SpringdaleArkansas 10.9
- 46MiamiFlorida 10.9
- 48ShakopeeMinnesota 10.8
- 48RiversideCalifornia 10.8
- 50VeniceFlorida 10.7
- 50Agouralow-cost sensorsCalifornia 10.7
- 52OcalaFlorida 10.6
- 53GainesvilleGeorgia 10.4
- 54East LakeFlorida 10.3
- 55HueytownAlabama 10.2
- 55BensalemPennsylvania 10.2
- 57Coconut CreekFlorida 10.1
- 57BartlettTennessee 10.1
- 59McAlesterOklahoma 10.0
- 60Bonita SpringsFlorida 9.8
- 60OdessaTexas 9.8
- 62Terre HauteIndiana 9.7
- 62ChalmetteLouisiana 9.7
- 62WyomingMichigan 9.7
- 65TallahasseeFlorida 9.6
- 65Ponca CityOklahoma 9.6
- 67LakelandFlorida 9.5
- 67Oklahoma CityOklahoma 9.5
- 67BanningCalifornia 9.5
- 70SarasotaFlorida 9.4
- 70ValricoFlorida 9.4
- 72HomesteadFlorida 9.3
- 72Chula VistaCalifornia 9.3
- 74KennerLouisiana 9.2
- 74St. LouisMissouri 9.2
- 74HattiesburgMississippi 9.2
- 74AdaOklahoma 9.2
- 74JenksOklahoma 9.2
- 74TulsaOklahoma 9.2
- 74AnaheimCalifornia 9.2
- 74MidwayFlorida 9.2
- 82PrichardAlabama 9.1
- 82JacksonMississippi 9.1
- 82El CajonCalifornia 9.1
- 85San DiegoCalifornia 9.0
- 85VictorvilleCalifornia 9.0
- 87MooreOklahoma 8.9
- 87ComptonCalifornia 8.9
- 89Columbialow-cost sensorsMissouri 8.8
- 89HollandMichigan 8.8
- 89Santa Monicalow-cost sensorsCalifornia 8.8
- 92TrussvilleAlabama 8.7
- 92DavieFlorida 8.7
- 92DurhamNorth Carolina 8.7
- 92BakersfieldCalifornia 8.7
- 92El CentroCalifornia 8.7
- 92Candler-McAfeeGeorgia 8.7
- 98Ponte Vedra BeachFlorida 8.6
- 98TampaFlorida 8.6
- 98ValdostaGeorgia 8.6
- 98ColumbusOhio 8.6
- 98PortervilleCalifornia 8.6
- 98PowayCalifornia 8.6
- 98San JoseCalifornia 8.6
- 98HobbsNew Mexico 8.6
- 106GadsdenAlabama 8.5
- 106Delray BeachFlorida 8.5
- 106Carsonlow-cost sensorsCalifornia 8.5
- 106Hawthornelow-cost sensorsCalifornia 8.5
- 106Inglewoodlow-cost sensorsCalifornia 8.5
- 111Fort SmithArkansas 8.4
- 111Deerfield BeachFlorida 8.4
- 111Lake MaryFlorida 8.4
- 111Winter ParkFlorida 8.4
- 111AlbanyGeorgia 8.4
- 111MiddletownOhio 8.4
- 111EdmondOklahoma 8.4
- 111RedfordMichigan 8.4
- 111SalinasCalifornia 8.4
- 120Forest ParkGeorgia 8.3
- 120KennesawGeorgia 8.3
- 120Saint AndrewsSouth Carolina 8.3
- 120OregonOhio 8.3
- 120OaklandCalifornia 8.3
- 125WellingtonFlorida 8.2
- 125ClevelandOhio 8.2
- 125Torrancelow-cost sensorsCalifornia 8.2
- 128IndianapolisIndiana 8.1
- 128New OrleansLouisiana 8.1
- 128FillmoreCalifornia 8.1
- 128Arroyo GrandeCalifornia 8.1
- 132Phenix CityAlabama 8.0
- 132PascagoulaMississippi 8.0
- 132PhiladelphiaPennsylvania 8.0
- 132RochesterMinnesota 8.0
- 132WestervilleOhio 8.0
- 132West MifflinPennsylvania 8.0
- 132CalexicoCalifornia 8.0
- 139Saint JosephMissouri 7.9
- 139FlorenceSouth Carolina 7.9
- 139East RidgeTennessee 7.9
- 139BurnsvilleMinnesota 7.9
- 139Lomitalow-cost sensorsCalifornia 7.9
- 144ColumbusGeorgia 7.8
- 144Granite CityIllinois 7.8
- 144EvansvilleIndiana 7.8
- 144NorwoodOhio 7.8
- 144Fort WayneIndiana 7.8
- 144Saint PaulMinnesota 7.8
- 144CantonOhio 7.8
- 144HelenaMontana 7.8
- 144BendOregon 7.8
- 153DecaturAlabama 7.7
- 153AtlantaGeorgia 7.7
- 153AugustaGeorgia 7.7
- 153GulfportMississippi 7.7
- 153CincinnatiOhio 7.7
- 153GaryIndiana 7.7
- 153DearbornMichigan 7.7
- 153KalamazooMichigan 7.7
- 153HollisterCalifornia 7.7
- 162West MemphisArkansas 7.6
- 162MaconGeorgia 7.6
- 162Warner RobinsGeorgia 7.6
- 162Lincoln ParkMichigan 7.6
- 166TopekaKansas 7.5
- 166Grand RapidsMichigan 7.5
- 166ToledoOhio 7.5
- 166WatertownSouth Dakota 7.5
- 166HanfordCalifornia 7.5
- 166OceansideCalifornia 7.5
- 166El PasoTexas 7.5
- 173FayettevilleNorth Carolina 7.4
- 173LebanonOhio 7.4
- 173SpringfieldOhio 7.4
- 173SpartanburgSouth Carolina 7.4
- 173HendersonvilleTennessee 7.4
- 173DetroitMichigan 7.4
- 173SteubenvilleOhio 7.4
- 173WheelingWest Virginia 7.4
- 173YumaArizona 7.4
- 173Thousand OaksCalifornia 7.4
- 183Palm CityFlorida 7.3
- 183Safety HarborFlorida 7.3
- 183JeffersonvilleIndiana 7.3
- 183Kansas CityKansas 7.3
- 183HernandoMississippi 7.3
- 183MorrisvilleNorth Carolina 7.3
- 183DaytonOhio 7.3
- 183White OakOhio 7.3
- 183AnkenyIowa 7.3
- 183WaterlooIowa 7.3
- 183East ChicagoIndiana 7.3
- 183DublinOhio 7.3
- 195MontgomeryAlabama 7.2
- 195JasperIndiana 7.2
- 195HickoryNorth Carolina 7.2
- 195PennsaukenNew Jersey 7.2
- 195ColumbiaTennessee 7.2
- 195MuncieIndiana 7.2
- 195PerrysburgOhio 7.2
- 195San LeandroCalifornia 7.2
- 203East Saint LouisIllinois 7.1
- 203ConwaySouth Carolina 7.1
- 203Calumet CityIllinois 7.1
- 203NapervilleIllinois 7.1
- 203MinneapolisMinnesota 7.1
- 203Lake ElsinoreCalifornia 7.1
- 203NipomoCalifornia 7.1
- 210Daytona BeachFlorida 7.0
- 210Ferry PassFlorida 7.0
- 210JacksonvilleFlorida 7.0
- 210West PensacolaFlorida 7.0
- 210ScaggsvilleMaryland 7.0
- 210GreensboroNorth Carolina 7.0
- 210Roanoke RapidsNorth Carolina 7.0
- 210GreenvilleSouth Carolina 7.0
- 210North CharlestonSouth Carolina 7.0
- 210ChattanoogaTennessee 7.0
- 210AshburnVirginia 7.0
- 210BrookfieldIllinois 7.0
- 210ChicagoIllinois 7.0
- 210EastpointeMichigan 7.0
- 210EwingNew Jersey 7.0
- 210WarrenOhio 7.0
- 210ClovisCalifornia 7.0
- 210FresnoCalifornia 7.0
- 210Long BeachCalifornia 7.0
- 229Valley StationKentucky 6.9
- 229CaryIllinois 6.9
- 229Apple ValleyMinnesota 6.9
- 229Casa GrandeArizona 6.9
- 229Santa BarbaraCalifornia 6.9
- 234DerbyKansas 6.8
- 234CharlotteNorth Carolina 6.8
- 234JacksonTennessee 6.8
- 234LindenNew Jersey 6.8
- 234New York CityNew York 6.8
- 239Fruit CoveFlorida 6.7
- 239GainesvilleFlorida 6.7
- 239WestonFlorida 6.7
- 239McDonoughGeorgia 6.7
- 239LouisvilleKentucky 6.7
- 239RaleighNorth Carolina 6.7
- 239NogalesArizona 6.7
- 239VisaliaCalifornia 6.7
- 239BismarckNorth Dakota 6.7
- 239RentonWashington 6.7
- 249HuntsvilleAlabama 6.6
- 249Palm BayFlorida 6.6
- 249Kansas CityMissouri 6.6
- 249PortsmouthOhio 6.6
- 249DyersburgTennessee 6.6
- 249MaryvilleTennessee 6.6
- 249Franklin ParkIllinois 6.6
- 249FlintMichigan 6.6
- 249BlaineMinnesota 6.6
- 249Saint MichaelMinnesota 6.6
- 249ElizabethNew Jersey 6.6
- 249AkronOhio 6.6
- 249HarrisburgPennsylvania 6.6
- 249Eau ClaireWisconsin 6.6
- 249Great FallsMontana 6.6
- 264PaducahKentucky 6.5
- 264FairhopeAlabama 6.5
- 264SavannahGeorgia 6.5
- 264Winston-SalemNorth Carolina 6.5
- 264YorkPennsylvania 6.5
- 264KnoxvilleTennessee 6.5
- 264JolietIllinois 6.5
- 264HammondIndiana 6.5
- 264South BendIndiana 6.5
- 264MedinaOhio 6.5
- 264LebanonPennsylvania 6.5
- 264MilwaukeeWisconsin 6.5
- 264UkiahCalifornia 6.5
- 277WashingtonDistrict of Columbia 6.4
- 277NewarkDelaware 6.4
- 277AthensGeorgia 6.4
- 277ClaytonNorth Carolina 6.4
- 277LexingtonNorth Carolina 6.4
- 277LawtonOklahoma 6.4
- 277HuntingtonWest Virginia 6.4
- 277ElkhartIndiana 6.4
- 277LafayetteIndiana 6.4
- 277PortageIndiana 6.4
- 277Bay CityMichigan 6.4
- 277JenisonMichigan 6.4
- 277TaylorMichigan 6.4
- 277Jersey CityNew Jersey 6.4
- 277PatersonNew Jersey 6.4
- 277TrentonNew Jersey 6.4
- 277BuffaloNew York 6.4
- 277WeirtonWest Virginia 6.4
- 277San FranciscoCalifornia 6.4
- 277Santa CruzCalifornia 6.4
- 297WilmingtonDelaware 6.3
- 297Saint MatthewsKentucky 6.3
- 297SewellNew Jersey 6.3
- 297Port HuronMichigan 6.3
- 297NorristownPennsylvania 6.3
- 297PittsburghPennsylvania 6.3
- 297AmarilloTexas 6.3
- 304FishersIndiana 6.2
- 304BaltimoreMaryland 6.2
- 304ChesapeakeVirginia 6.2
- 304Des PlainesIllinois 6.2
- 304AndersonIndiana 6.2
- 304YoungstownOhio 6.2
- 304McKeesportPennsylvania 6.2
- 304WilkinsburgPennsylvania 6.2
- 304StocktonCalifornia 6.2
- 304TurlockCalifornia 6.2
- 304RexburgIdaho 6.2
- 315BrunswickGeorgia 6.1
- 315DecaturIllinois 6.1
- 315OlatheKansas 6.1
- 315JeffersontownKentucky 6.1
- 315SpringfieldMissouri 6.1
- 315University CityMissouri 6.1
- 315ClemmonsNorth Carolina 6.1
- 315ClarksvilleTennessee 6.1
- 315CookevilleTennessee 6.1
- 315East HamptonVirginia 6.1
- 315RichmondVirginia 6.1
- 315Rose HillVirginia 6.1
- 315ChampaignIllinois 6.1
- 315Michigan CityIndiana 6.1
- 315LansingMichigan 6.1
- 315TucsonArizona 6.1
- 331Fort ThomasKentucky 6.0
- 331ChesterPennsylvania 6.0
- 331KingsportTennessee 6.0
- 331SpringfieldVirginia 6.0
- 331CharlestonWest Virginia 6.0
- 331KokomoIndiana 6.0
- 331YpsilantiMichigan 6.0
- 331Saint CloudMinnesota 6.0
- 331ScrantonPennsylvania 6.0
- 331MaranaArizona 6.0
- 331LompocCalifornia 6.0
- 331San Luis ObispoCalifornia 6.0
- 331LubbockTexas 6.0
- 331Columbia CityWashington 6.0
- 345BearDelaware 5.9
- 345ArnoldMissouri 5.9
- 345LemayMissouri 5.9
- 345Iowa CityIowa 5.9
- 345West FargoNorth Dakota 5.9
- 345Fort LeeNew Jersey 5.9
- 345MesaArizona 5.9
- 345PhoenixArizona 5.9
- 345MaderaCalifornia 5.9
- 345San RafaelCalifornia 5.9
- 355DoverDelaware 5.8
- 355ColumbusIndiana 5.8
- 355Toms RiverNew Jersey 5.8
- 355ClintonIowa 5.8
- 355EriePennsylvania 5.8
- 355LancasterPennsylvania 5.8
- 355BrookingsSouth Dakota 5.8
- 355MadisonWisconsin 5.8
- 355WaukeshaWisconsin 5.8
- 355Weirton HeightsWest Virginia 5.8
- 355Casas AdobesArizona 5.8
- 355CorcoranCalifornia 5.8
- 355LancasterCalifornia 5.8
- 355OrcuttCalifornia 5.8
- 369AshlandKentucky 5.7
- 369AshevilleNorth Carolina 5.7
- 369CharlottesvilleVirginia 5.7
- 369NorthbrookIllinois 5.7
- 369RockfordIllinois 5.7
- 369New BrunswickNew Jersey 5.7
- 369RochesterNew York 5.7
- 369AllentownPennsylvania 5.7
- 369ModestoCalifornia 5.7
- 369Rapid CitySouth Dakota 5.7
- 369MillcreekUtah 5.7
- 369Oxon Hill-GlassmanorMaryland 5.7
- 381GreenvilleNorth Carolina 5.6
- 381DanburyConnecticut 5.6
- 381PeoriaIllinois 5.6
- 381AlbanyNew York 5.6
- 381PainesvilleOhio 5.6
- 381Shaker HeightsOhio 5.6
- 381ReadingPennsylvania 5.6
- 381TempeArizona 5.6
- 381MantecaCalifornia 5.6
- 381AlbuquerqueNew Mexico 5.6
- 381HighlandUtah 5.6
- 392SpringfieldIllinois 5.5
- 392New AlbanyIndiana 5.5
- 392South VinelandNew Jersey 5.5
- 392HarrisonburgVirginia 5.5
- 392HopewellVirginia 5.5
- 392Cleveland HeightsOhio 5.5
- 392Oak LawnIllinois 5.5
- 392Lexingtonlow-cost sensorsMassachusetts 5.5
- 392AugustaMaine 5.5
- 392BethlehemPennsylvania 5.5
- 392RosevilleCalifornia 5.5
- 392TacomaWashington 5.5
- 404Hunt ValleyMaryland 5.4
- 404DavenportIowa 5.4
- 404Des MoinesIowa 5.4
- 404BloomingtonIllinois 5.4
- 404CarlislePennsylvania 5.4
- 404HermitagePennsylvania 5.4
- 404Arden-ArcadeCalifornia 5.4
- 411BloomingtonIndiana 5.3
- 411Atlantic CityNew Jersey 5.3
- 411New HavenConnecticut 5.3
- 411MuscatineIowa 5.3
- 411JohnstownPennsylvania 5.3
- 411AppletonWisconsin 5.3
- 411South MilwaukeeWisconsin 5.3
- 411Las VegasNevada 5.3
- 419Upper AltonIllinois 5.2
- 419RoanokeVirginia 5.2
- 419OmahaNebraska 5.2
- 419GahannaOhio 5.2
- 419BridgeportConnecticut 5.2
- 419GaltCalifornia 5.2
- 419Seasidelow-cost sensorsCalifornia 5.2
- 426Lexington-FayetteKentucky 5.1
- 426ElktonMaryland 5.1
- 426Wake Forestlow-cost sensorsNorth Carolina 5.1
- 426HartfordConnecticut 5.1
- 426WaterburyConnecticut 5.1
- 426BostonMassachusetts 5.1
- 426BellevueNebraska 5.1
- 426KenmoreNew York 5.1
- 426SuperiorWisconsin 5.1
- 426LincolnCalifornia 5.1
- 426Yuba CityCalifornia 5.1
- 426Dodge CityKansas 5.1
- 426BadgerAlaska 5.1
- 439EdgewoodMaryland 5.0
- 439RaymoreMissouri 5.0
- 439Las CrucesNew Mexico 5.0
- 439OremUtah 5.0
- 443SpringfieldMassachusetts 4.9
- 443LimaOhio 4.9
- 443Green BayWisconsin 4.9
- 443Redwood CityCalifornia 4.9
- 443SacramentoCalifornia 4.9
- 443LewistonIdaho 4.9
- 449DuluthMinnesota 4.8
- 449AberdeenSouth Dakota 4.8
- 449RutlandVermont 4.8
- 449GlendaleArizona 4.8
- 449Spring ValleyNevada 4.8
- 449Cedar CityUtah 4.8
- 449SeattleWashington 4.8
- 449KahuluiHawaii 4.8
- 457MolineIllinois 4.7
- 457LowellMassachusetts 4.7
- 457WorcesterMassachusetts 4.7
- 457FolsomCalifornia 4.7
- 457RedmondOregon 4.7
- 462ZionIllinois 4.6
- 462LynnMassachusetts 4.6
- 462PortlandMaine 4.6
- 462LincolnNebraska 4.6
- 462State CollegePennsylvania 4.6
- 462AtascaderoCalifornia 4.6
- 462MercedCalifornia 4.6
- 462Apache JunctionArizona 4.6
- 462West JordanUtah 4.6
- 462Makakilo / Kapolei / Honokai HaleHawaii 4.6
- 472South LaurelMaryland 4.5
- 472LibertyMissouri 4.5
- 472New LondonConnecticut 4.5
- 472BrocktonMassachusetts 4.5
- 472PortsmouthNew Hampshire 4.5
- 472HolbrookNew York 4.5
- 472Carson CityNevada 4.5
- 472Salt Lake CityUtah 4.5
- 472Spanish ForkUtah 4.5
- 481PittsfieldMassachusetts 4.4
- 481QuincyMassachusetts 4.4
- 481LewistonMaine 4.4
- 481TracyCalifornia 4.4
- 481CondaIdaho 4.4
- 481BozemanMontana 4.4
- 481RandolphNew Jersey 4.4
- 488GreenfieldMassachusetts 4.3
- 488KeeneNew Hampshire 4.3
- 488WoodlandCalifornia 4.3
- 488West Valley CityUtah 4.3
- 488BellinghamWashington 4.3
- 493RockvilleMaryland 4.2
- 493Rio RanchoNew Mexico 4.2
- 493HendersonNevada 4.2
- 493HonoluluHawaii 4.2
- 497ElizabethtownKentucky 4.1
- 497Fall RiverMassachusetts 4.1
- 497North ChicopeeMassachusetts 4.1
- 497DerryNew Hampshire 4.1
- 497SyracuseNew York 4.1
- 497ProvidenceRhode Island 4.1
- 497MoscowIdaho 4.1
- 497Summerlin SouthNevada 4.1
- 505UticaNew York 4.0
- 505White PlainsNew York 4.0
- 505Colorado SpringsColorado 4.0
- 505ThorntonColorado 4.0
- 505EnterpriseNevada 4.0
- 505HurricaneUtah 4.0
- 505MagnaUtah 4.0
- 505AuburnWashington 4.0
- 513MasonOhio 3.9
- 513NewburghNew York 3.9
- 513AltoonaPennsylvania 3.9
- 513Sioux FallsSouth Dakota 3.9
- 513DavisCalifornia 3.9
- 513TruckeeCalifornia 3.9
- 513DenverColorado 3.9
- 513RenoNevada 3.9
- 513NampaIdaho 3.9
- 513TigardOregon 3.9
- 513Port AngelesWashington 3.9
- 524PuebloColorado 3.8
- 524ReddingCalifornia 3.8
- 524MilwaukieOregon 3.8
- 524CheyenneWyoming 3.8
- 528BangorMaine 3.7
- 528LaconiaNew Hampshire 3.7
- 528ParadiseCalifornia 3.7
- 528Boulder CityNevada 3.7
- 528ButteMontana 3.7
- 528HerrimanUtah 3.7
- 534MarquetteMichigan 3.6
- 534Idaho FallsIdaho 3.6
- 534Salmon CreekWashington 3.6
- 534WenatcheeWashington 3.6
- 538New CityNew York 3.5
- 538Green ValleyArizona 3.5
- 538ChicoCalifornia 3.5
- 538MesquiteNevada 3.5
- 538Spanish SpringsNevada 3.5
- 538PocatelloIdaho 3.5
- 538Twin FallsIdaho 3.5
- 538TooeleUtah 3.5
- 546Fort CollinsColorado 3.4
- 546BountifulUtah 3.4
- 546North OgdenUtah 3.4
- 546SunnysideWashington 3.4
- 546GilletteWyoming 3.4
- 546KīheiHawaii 3.4
- 552LittletonColorado 3.3
- 552EugeneOregon 3.3
- 552LaceyWashington 3.3
- 552Moses LakeWashington 3.3
- 552FairbanksAlaska 3.3
- 557BayonneNew Jersey 3.2
- 557PawtucketRhode Island 3.2
- 557GreeleyColorado 3.2
- 557BremertonWashington 3.2
- 557HiloHawaii 3.2
- 557AnchorageAlaska 3.2
- 563HagerstownMaryland 3.1
- 563MeridianIdaho 3.1
- 563CanbyOregon 3.1
- 563GreshamOregon 3.1
- 563MedfordOregon 3.1
- 563The DallesOregon 3.1
- 563CentraliaWashington 3.1
- 563ParklandWashington 3.1
- 563Rock SpringsWyoming 3.1
- 572Ken CarylColorado 3.0
- 572BillingsMontana 3.0
- 572AltamontOregon 3.0
- 572HillsboroOregon 3.0
- 572RoseburgOregon 3.0
- 572SalemOregon 3.0
- 578Grand JunctionColorado 2.9
- 578Coeur d'AleneIdaho 2.9
- 578AlbanyOregon 2.9
- 578AberdeenWashington 2.9
- 578LongviewWashington 2.9
- 578Mount VernonWashington 2.9
- 584AshlandOregon 2.8
- 584Grants PassOregon 2.8
- 584HermistonOregon 2.8
- 584PortlandOregon 2.8
- 588VacavilleCalifornia 2.7
- 588VancouverWashington 2.7
- 588YakimaWashington 2.7
- 591Coos BayOregon 2.6
- 591WoodburnOregon 2.6
- 591SpokaneWashington 2.6
- 594Elk Grovelow-cost sensorsCalifornia 2.5
- 594BoiseIdaho 2.5
- 594MissoulaMontana 2.5
- 594AnacortesWashington 2.5
- 594CasperWyoming 2.5
- 594SheridanWyoming 2.5
- 600BeavertonOregon 2.4
- 600Walla WallaWashington 2.4
- 602LaramieWyoming 2.3
- 603CoventryRhode Island 2.2
- 603CorvallisOregon 2.2
- 603Forest GroveOregon 2.2
- 603ShorelineWashington 2.2
- 607PendletonOregon 2.1
- 607PascoWashington 2.1
- 609DallasOregon 2.0
- 609McMinnvilleOregon 2.0
- 611PullmanWashington 1.9
- 612Florinlow-cost sensorsCalifornia 1.8
- 613Oak HarborWashington 1.7
- 613Tri-CitiesWashington 1.7
- 615BellevueWashington 1.4
- 615Spokane ValleyWashington 1.4
- 617OrchardsWashington 1.3
- 618IssaquahWashington 1.1
- 619MarysvilleWashington 1.0
- 620EllensburgWashington 0.9
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+