SmogRank / Countries / United States / December 2025
Most polluted cities in United States, December 2025
673 cities in United States ranked by their average PM2.5 over the 31 days. Worst: Tulare at 26.6 µg/m³, #255 of 2,360 cities in the world. Cleanest: Parker at 0.1. A city needs measurements on 70% of the days to be ranked.
- 1Tularelow-cost sensorsCalifornia 26.6
- 2Delanolow-cost sensorsCalifornia 26.0
- 3Huntington Beachlow-cost sensorsCalifornia 25.4
- 4WhittierCalifornia 24.3
- 5Jurupa ValleyCalifornia 22.2
- 6ComptonCalifornia 20.6
- 7Hawthornelow-cost sensorsCalifornia 19.8
- 8BakersfieldCalifornia 19.2
- 9NogalesArizona 19.0
- 10BadgerAlaska 18.3
- 11Carsonlow-cost sensorsCalifornia 18.1
- 12RiversideCalifornia 17.5
- 13Long BeachCalifornia 17.3
- 14Inglewoodlow-cost sensorsCalifornia 17.2
- 15AnaheimCalifornia 17.1
- 16FresnoCalifornia 16.9
- 17ModestoCalifornia 16.6
- 18Las VegasNevada 16.2
- 19Wheatonlow-cost sensorsIllinois 16.0
- 20YorkPennsylvania 15.7
- 20CalexicoCalifornia 15.7
- 22VisaliaCalifornia 15.6
- 23MaderaCalifornia 15.5
- 23SocorroTexas 15.5
- 25PhoenixArizona 15.4
- 25Torrancelow-cost sensorsCalifornia 15.4
- 27RedfordMichigan 15.3
- 28San DiegoCalifornia 15.2
- 29Florinlow-cost sensorsCalifornia 15.0
- 30Pasadenalow-cost sensorsCalifornia 14.9
- 30FairbanksAlaska 14.9
- 32Palo Altolow-cost sensorsCalifornia 14.8
- 33Los AngelesCalifornia 14.5
- 34Santa Monicalow-cost sensorsCalifornia 14.1
- 35LawrencevilleGeorgia 14.0
- 35MercedCalifornia 14.0
- 37BurbankCalifornia 13.7
- 37CorcoranCalifornia 13.7
- 39HanfordCalifornia 13.5
- 40Lomitalow-cost sensorsCalifornia 13.3
- 40El PasoTexas 13.3
- 40AnchorageAlaska 13.3
- 43PaysonArizona 13.2
- 44PortsmouthOhio 13.0
- 44FontanaCalifornia 13.0
- 46AugustaGeorgia 12.7
- 47Camdenlow-cost sensorsNew Jersey 12.6
- 47MedfordOregon 12.6
- 49MantecaCalifornia 12.4
- 49StocktonCalifornia 12.4
- 51TurlockCalifornia 12.3
- 52HoustonTexas 12.2
- 52South San Franciscolow-cost sensorsCalifornia 12.2
- 54Royal Oaklow-cost sensorsMichigan 12.1
- 55El CajonCalifornia 12.0
- 55AltamontOregon 12.0
- 57Wake Forestlow-cost sensorsNorth Carolina 11.8
- 57Fort WayneIndiana 11.8
- 57OaklandCalifornia 11.8
- 60MaconGeorgia 11.7
- 60McAlesterOklahoma 11.7
- 60MuscatineIowa 11.7
- 60WaterlooIowa 11.7
- 64LexingtonNorth Carolina 11.6
- 65Ann Arborlow-cost sensorsMichigan 11.5
- 65ClovisCalifornia 11.5
- 65Arden-ArcadeCalifornia 11.5
- 68Franklin ParkIllinois 11.4
- 68Abingtonlow-cost sensorsPennsylvania 11.4
- 68San FranciscoCalifornia 11.4
- 68WoodlandCalifornia 11.4
- 72WestervilleOhio 11.3
- 73BrookfieldIllinois 11.2
- 73Chula VistaCalifornia 11.2
- 75LancasterPennsylvania 11.1
- 76IndianapolisIndiana 11.0
- 76Columbialow-cost sensorsMissouri 11.0
- 76MiddletownOhio 11.0
- 76Oconomowoclow-cost sensorsWisconsin 11.0
- 76San JoseCalifornia 11.0
- 76UkiahCalifornia 11.0
- 76ReddingCalifornia 11.0
- 83LouisvilleKentucky 10.9
- 83East RidgeTennessee 10.9
- 83Des PlainesIllinois 10.9
- 83Elmwood ParkIllinois 10.9
- 87NorwoodOhio 10.8
- 87GreenvilleSouth Carolina 10.8
- 89DoltonIllinois 10.7
- 89LafayetteIndiana 10.7
- 89OregonOhio 10.7
- 89RosevilleCalifornia 10.7
- 93LewistonIdaho 10.6
- 94JeffersonvilleIndiana 10.5
- 94PerrysburgOhio 10.5
- 94LincolnCalifornia 10.5
- 94Grants PassOregon 10.5
- 98Calumet CityIllinois 10.4
- 98BensalemPennsylvania 10.4
- 98Mission ViejoCalifornia 10.4
- 98PortervilleCalifornia 10.4
- 102LebanonPennsylvania 10.3
- 103ValdostaGeorgia 10.2
- 103North CharlestonSouth Carolina 10.2
- 103OceansideCalifornia 10.2
- 103RenoNevada 10.2
- 107SavannahGeorgia 10.1
- 107Granite CityIllinois 10.1
- 107WichitaKansas 10.1
- 107Valley StationKentucky 10.1
- 111Little RockArkansas 10.0
- 111ChicagoIllinois 10.0
- 111MolineIllinois 10.0
- 111GaryIndiana 10.0
- 111AlbanyNew York 10.0
- 111HarrisburgPennsylvania 10.0
- 111YakimaWashington 10.0
- 118GainesvilleGeorgia 9.9
- 118CincinnatiOhio 9.9
- 118LaredoTexas 9.9
- 118ClintonIowa 9.9
- 118DavenportIowa 9.9
- 118ElginIllinois 9.9
- 118DublinOhio 9.9
- 118SacramentoCalifornia 9.9
- 126ColumbusOhio 9.8
- 126BridgeviewIllinois 9.8
- 126PeoriaIllinois 9.8
- 126ReadingPennsylvania 9.8
- 130BirminghamAlabama 9.7
- 130AthensGeorgia 9.7
- 130DaytonOhio 9.7
- 130San AntonioTexas 9.7
- 130MuncieIndiana 9.7
- 130ToledoOhio 9.7
- 136WilmingtonDelaware 9.6
- 136EvansvilleIndiana 9.6
- 136OwensboroKentucky 9.6
- 136Saint MatthewsKentucky 9.6
- 136NashvilleTennessee 9.6
- 136ConroeTexas 9.6
- 136BerkeleyCalifornia 9.6
- 136RichmondCalifornia 9.6
- 144Upper AltonIllinois 9.5
- 144Iowa CityIowa 9.5
- 144ElkhartIndiana 9.5
- 144PortageIndiana 9.5
- 144DetroitMichigan 9.5
- 144ClevelandOhio 9.5
- 144GlendaleArizona 9.5
- 144GaltCalifornia 9.5
- 152East Saint LouisIllinois 9.4
- 152JasperIndiana 9.4
- 152Kansas CityKansas 9.4
- 152PhiladelphiaPennsylvania 9.4
- 152PasadenaTexas 9.4
- 152East ChicagoIndiana 9.4
- 158BrunswickGeorgia 9.3
- 158Warner RobinsGeorgia 9.3
- 158BaytownTexas 9.3
- 158RockfordIllinois 9.3
- 158AndersonIndiana 9.3
- 158CarlislePennsylvania 9.3
- 164ShreveportLouisiana 9.2
- 164EssexMaryland 9.2
- 164PennsaukenNew Jersey 9.2
- 164Mission BendTexas 9.2
- 164JolietIllinois 9.2
- 164HammondIndiana 9.2
- 170JeffersontownKentucky 9.1
- 170ClemmonsNorth Carolina 9.1
- 170SpartanburgSouth Carolina 9.1
- 170EdinburgTexas 9.1
- 170MissionTexas 9.1
- 170DearbornMichigan 9.1
- 170SuperiorWisconsin 9.1
- 177BloomingtonIndiana 9.0
- 177Hunt ValleyMaryland 9.0
- 177KokomoIndiana 9.0
- 177WyomingMichigan 9.0
- 177HolbrookNew York 9.0
- 177BethlehemPennsylvania 9.0
- 177South MilwaukeeWisconsin 9.0
- 184ChattanoogaTennessee 8.9
- 184TexarkanaTexas 8.9
- 184Cedar RapidsIowa 8.9
- 184AuroraIllinois 8.9
- 184AkronOhio 8.9
- 184SteubenvilleOhio 8.9
- 184WaukeshaWisconsin 8.9
- 184Great FallsMontana 8.9
- 192PaducahKentucky 8.8
- 192Terre HauteIndiana 8.8
- 192ElizabethtownKentucky 8.8
- 192ChesterPennsylvania 8.8
- 192FlorenceSouth Carolina 8.8
- 192Michigan CityIndiana 8.8
- 192NorristownPennsylvania 8.8
- 192Agouralow-cost sensorsCalifornia 8.8
- 192ChicoCalifornia 8.8
- 192San LeandroCalifornia 8.8
- 202GadsdenAlabama 8.7
- 202AshlandKentucky 8.7
- 202LebanonOhio 8.7
- 202SpringfieldOhio 8.7
- 202BartlettTennessee 8.7
- 202AustinTexas 8.7
- 202Lincoln ParkMichigan 8.7
- 202CantonOhio 8.7
- 202MedinaOhio 8.7
- 202MilwaukeeWisconsin 8.7
- 202GlendoraCalifornia 8.7
- 202Candler-McAfeeGeorgia 8.7
- 214NewarkDelaware 8.6
- 214DecaturIllinois 8.6
- 214EdgewoodMaryland 8.6
- 214JacksonMississippi 8.6
- 214FayettevilleNorth Carolina 8.6
- 214Winston-SalemNorth Carolina 8.6
- 214MooreOklahoma 8.6
- 214BloomingtonIllinois 8.6
- 214NapervilleIllinois 8.6
- 214Oak LawnIllinois 8.6
- 214AllentownPennsylvania 8.6
- 214BrookingsSouth Dakota 8.6
- 214Eau ClaireWisconsin 8.6
- 214PowayCalifornia 8.6
- 214VictorvilleCalifornia 8.6
- 214Rio RanchoNew Mexico 8.6
- 214MillcreekUtah 8.6
- 231ColumbusGeorgia 8.5
- 231New AlbanyIndiana 8.5
- 231DurhamNorth Carolina 8.5
- 231TulsaOklahoma 8.5
- 231Corpus ChristiTexas 8.5
- 231ChampaignIllinois 8.5
- 231KalamazooMichigan 8.5
- 231WarrenOhio 8.5
- 239OlatheKansas 8.4
- 239Oklahoma CityOklahoma 8.4
- 239HendersonvilleTennessee 8.4
- 239KnoxvilleTennessee 8.4
- 239BrownsvilleTexas 8.4
- 239South BendIndiana 8.4
- 239HollandMichigan 8.4
- 239MinneapolisMinnesota 8.4
- 239VacavilleCalifornia 8.4
- 248JacksonvilleFlorida 8.3
- 248Lexington-FayetteKentucky 8.3
- 248CharlotteNorth Carolina 8.3
- 248TucsonArizona 8.3
- 252TrussvilleAlabama 8.2
- 252ColumbusIndiana 8.2
- 252TopekaKansas 8.2
- 252Baton RougeLouisiana 8.2
- 252SulphurLouisiana 8.2
- 252LemayMissouri 8.2
- 252Saint JosephMissouri 8.2
- 252St. LouisMissouri 8.2
- 252HattiesburgMississippi 8.2
- 252RaleighNorth Carolina 8.2
- 252Saint AndrewsSouth Carolina 8.2
- 252Fort WorthTexas 8.2
- 252PortlandMaine 8.2
- 252GahannaOhio 8.2
- 252NampaIdaho 8.2
- 252WenatcheeWashington 8.2
- 268TallahasseeFlorida 8.1
- 268NicholasvilleKentucky 8.1
- 268HernandoMississippi 8.1
- 268Fort DodgeIowa 8.1
- 268SouthfieldMichigan 8.1
- 268New York CityNew York 8.1
- 268West MifflinPennsylvania 8.1
- 268Grand JunctionColorado 8.1
- 268AlbuquerqueNew Mexico 8.1
- 277HueytownAlabama 8.0
- 277HuntsvilleAlabama 8.0
- 277DerbyKansas 8.0
- 277EdmondOklahoma 8.0
- 277Bay CityMichigan 8.0
- 277TaylorMichigan 8.0
- 277YpsilantiMichigan 8.0
- 277BayonneNew Jersey 8.0
- 277Shaker HeightsOhio 8.0
- 277MartinezCalifornia 8.0
- 287MiamiFlorida 7.9
- 287Ponte Vedra BeachFlorida 7.9
- 287University CityMissouri 7.9
- 287HickoryNorth Carolina 7.9
- 287JenksOklahoma 7.9
- 287SaginawTexas 7.9
- 287HuntingtonWest Virginia 7.9
- 287CaryIllinois 7.9
- 287Grand RapidsMichigan 7.9
- 287Saint PaulMinnesota 7.9
- 287YoungstownOhio 7.9
- 287ScrantonPennsylvania 7.9
- 287TempeArizona 7.9
- 300Kendale LakesFlorida 7.8
- 300Live OakTexas 7.8
- 300Missouri CityTexas 7.8
- 300ZionIllinois 7.8
- 300EastpointeMichigan 7.8
- 300LindenNew Jersey 7.8
- 300MadisonWisconsin 7.8
- 300San RafaelCalifornia 7.8
- 308BessemerAlabama 7.7
- 308SpringdaleArkansas 7.7
- 308SpringfieldIllinois 7.7
- 308Fort ThomasKentucky 7.7
- 308GreensboroNorth Carolina 7.7
- 308HartfordConnecticut 7.7
- 308NorthbrookIllinois 7.7
- 308GreenfieldMassachusetts 7.7
- 308BlaineMinnesota 7.7
- 308BurnsvilleMinnesota 7.7
- 308DuluthMinnesota 7.7
- 308ShakopeeMinnesota 7.7
- 308EwingNew Jersey 7.7
- 308Jersey CityNew Jersey 7.7
- 308Eagle PassTexas 7.7
- 323AlbanyGeorgia 7.6
- 323South VinelandNew Jersey 7.6
- 323MasonOhio 7.6
- 323Ponca CityOklahoma 7.6
- 323ClarksvilleTennessee 7.6
- 323Des MoinesIowa 7.6
- 323Apple ValleyMinnesota 7.6
- 323RochesterMinnesota 7.6
- 323PatersonNew Jersey 7.6
- 323PittsburghPennsylvania 7.6
- 323WilkinsburgPennsylvania 7.6
- 323Redwood CityCalifornia 7.6
- 323RoseburgOregon 7.6
- 336BaltimoreMaryland 7.5
- 336MorrisvilleNorth Carolina 7.5
- 336SpringfieldVirginia 7.5
- 336Cleveland HeightsOhio 7.5
- 336LimaOhio 7.5
- 336AppletonWisconsin 7.5
- 336Green BayWisconsin 7.5
- 336ConcordCalifornia 7.5
- 336PendletonOregon 7.5
- 336Port AngelesWashington 7.5
- 346OcalaFlorida 7.4
- 346RockvilleMaryland 7.4
- 346Kansas CityMissouri 7.4
- 346Toms RiverNew Jersey 7.4
- 346DentonTexas 7.4
- 346Port HuronMichigan 7.4
- 346HermitagePennsylvania 7.4
- 346GreeleyColorado 7.4
- 354MontgomeryAlabama 7.3
- 354DoverDelaware 7.3
- 354AtlantaGeorgia 7.3
- 354ColumbiaTennessee 7.3
- 354MankatoMinnesota 7.3
- 354Saint CloudMinnesota 7.3
- 354Fort LeeNew Jersey 7.3
- 354Lake ElsinoreCalifornia 7.3
- 354Santa RosaCalifornia 7.3
- 354Yuba CityCalifornia 7.3
- 354West Valley CityUtah 7.3
- 365West MemphisArkansas 7.2
- 365Bonita SpringsFlorida 7.2
- 365St. PetersburgFlorida 7.2
- 365VeniceFlorida 7.2
- 365KennerLouisiana 7.2
- 365ClaytonNorth Carolina 7.2
- 365White OakOhio 7.2
- 365LansingMichigan 7.2
- 365Saint MichaelMinnesota 7.2
- 365JohnstownPennsylvania 7.2
- 365MesaArizona 7.2
- 365VallejoCalifornia 7.2
- 365OdessaTexas 7.2
- 378DecaturAlabama 7.1
- 378Fort LauderdaleFlorida 7.1
- 378ArnoldMissouri 7.1
- 378DallasTexas 7.1
- 378CharlestonWest Virginia 7.1
- 378SpringfieldMassachusetts 7.1
- 378McKeesportPennsylvania 7.1
- 378State CollegePennsylvania 7.1
- 378AtascaderoCalifornia 7.1
- 378DavisCalifornia 7.1
- 378TacomaWashington 7.1
- 378VancouverWashington 7.1
- 390TampaFlorida 7.0
- 390ValricoFlorida 7.0
- 390ElktonMaryland 7.0
- 390LawtonOklahoma 7.0
- 390JacksonTennessee 7.0
- 390College StationTexas 7.0
- 390ChesapeakeVirginia 7.0
- 390JenisonMichigan 7.0
- 390PainesvilleOhio 7.0
- 399WashingtonDistrict of Columbia 6.9
- 399BearDelaware 6.9
- 399GreenvilleNorth Carolina 6.9
- 399CorsicanaTexas 6.9
- 399DanburyConnecticut 6.9
- 399IndioCalifornia 6.9
- 399PleasantonCalifornia 6.9
- 399Windsorlow-cost sensorsCalifornia 6.9
- 399AshlandOregon 6.9
- 399West JordanUtah 6.9
- 399SunnysideWashington 6.9
- 410Fort SmithArkansas 6.8
- 410Fruit CoveFlorida 6.8
- 410Oak RidgeFlorida 6.8
- 410LeawoodKansas 6.8
- 410DyersburgTennessee 6.8
- 410MaryvilleTennessee 6.8
- 410AnkenyIowa 6.8
- 410HaverhillMassachusetts 6.8
- 410BellevueNebraska 6.8
- 410UticaNew York 6.8
- 410ProvidenceRhode Island 6.8
- 410RutlandVermont 6.8
- 410Middletonlow-cost sensorsWisconsin 6.8
- 410OxnardCalifornia 6.8
- 410Spring ValleyNevada 6.8
- 410HelenaMontana 6.8
- 410Columbia CityWashington 6.8
- 427AshevilleNorth Carolina 6.7
- 427RichmondVirginia 6.7
- 427New HavenConnecticut 6.7
- 427WaterburyConnecticut 6.7
- 427Upper Saint ClairPennsylvania 6.7
- 427MaranaArizona 6.7
- 427HillsboroOregon 6.7
- 427MagnaUtah 6.7
- 427Salt Lake CityUtah 6.7
- 427MidwayFlorida 6.7
- 437OrlandoFlorida 6.6
- 437FishersIndiana 6.6
- 437AshburnVirginia 6.6
- 437HarrisonburgVirginia 6.6
- 437KeeneNew Hampshire 6.6
- 437ElizabethNew Jersey 6.6
- 437AltoonaPennsylvania 6.6
- 437OremUtah 6.6
- 445Lake MaryFlorida 6.5
- 445Palm CityFlorida 6.5
- 445South LaurelMaryland 6.5
- 445SpringfieldMissouri 6.5
- 445CharlottesvilleVirginia 6.5
- 445BuffaloNew York 6.5
- 445RochesterNew York 6.5
- 445FolsomCalifornia 6.5
- 445Santa BarbaraCalifornia 6.5
- 445Santa CruzCalifornia 6.5
- 445LongmontColorado 6.5
- 445BozemanMontana 6.5
- 445EllensburgWashington 6.5
- 445ParklandWashington 6.5
- 459Daytona BeachFlorida 6.4
- 459Deerfield BeachFlorida 6.4
- 459Fort MyersFlorida 6.4
- 459Pompano BeachFlorida 6.4
- 459BeltonTexas 6.4
- 459El CentroCalifornia 6.4
- 459LivermoreCalifornia 6.4
- 459Simi ValleyCalifornia 6.4
- 459HermistonOregon 6.4
- 459BountifulUtah 6.4
- 469ScaggsvilleMaryland 6.3
- 469RaymoreMissouri 6.3
- 469CookevilleTennessee 6.3
- 469RoanokeVirginia 6.3
- 469Rose HillVirginia 6.3
- 469TrentonNew Jersey 6.3
- 469New CityNew York 6.3
- 469EriePennsylvania 6.3
- 469BridgeportConnecticut 6.3
- 469BillingsMontana 6.3
- 469The DallesOregon 6.3
- 480PrichardAlabama 6.2
- 480White PlainsNew York 6.2
- 480SalemOregon 6.2
- 480AuburnWashington 6.2
- 480Oxon Hill-GlassmanorMaryland 6.2
- 485East HamptonVirginia 6.1
- 485HopewellVirginia 6.1
- 485La VistaNebraska 6.1
- 485OmahaNebraska 6.1
- 485Weirton HeightsWest Virginia 6.1
- 485South Lake TahoeCalifornia 6.1
- 485ThorntonColorado 6.1
- 492Safety HarborFlorida 6.0
- 492WellingtonFlorida 6.0
- 492PascagoulaMississippi 6.0
- 492SewellNew Jersey 6.0
- 492BostonMassachusetts 6.0
- 492LewistonMaine 6.0
- 492BrawleyCalifornia 6.0
- 492TracyCalifornia 6.0
- 492EugeneOregon 6.0
- 501SarasotaFlorida 5.9
- 501Winter ParkFlorida 5.9
- 501LibertyMissouri 5.9
- 501GulfportMississippi 5.9
- 501KingsportTennessee 5.9
- 501La PorteTexas 5.9
- 501Short PumpVirginia 5.9
- 501FraminghamMassachusetts 5.9
- 501AugustaMaine 5.9
- 501New BrunswickNew Jersey 5.9
- 501Santa ClaritaCalifornia 5.9
- 501ButteMontana 5.9
- 501BismarckNorth Dakota 5.9
- 501McMinnvilleOregon 5.9
- 515Delray BeachFlorida 5.8
- 515Fort CollinsColorado 5.8
- 515BendOregon 5.8
- 515TigardOregon 5.8
- 519DavieFlorida 5.7
- 519ChalmetteLouisiana 5.7
- 519LafayetteLouisiana 5.7
- 519San MarcosTexas 5.7
- 519North ChicopeeMassachusetts 5.7
- 519BangorMaine 5.7
- 519West FargoNorth Dakota 5.7
- 519Sunland ParkNew Mexico 5.7
- 519MilwaukieOregon 5.7
- 519Oregon CityOregon 5.7
- 519Spanish ForkUtah 5.7
- 519Four CornersFlorida 5.7
- 531McDonoughGeorgia 5.6
- 531LowellMassachusetts 5.6
- 531LaconiaNew Hampshire 5.6
- 531AberdeenSouth Dakota 5.6
- 531Casas AdobesArizona 5.6
- 531HendersonNevada 5.6
- 531Picnic Point-North LynnwoodWashington 5.6
- 531Tri-CitiesWashington 5.6
- 539New LondonConnecticut 5.5
- 539LincolnNebraska 5.5
- 539Coeur d'AleneIdaho 5.5
- 539WoodburnOregon 5.5
- 539RentonWashington 5.5
- 544Belle GladeFlorida 5.4
- 544East LakeFlorida 5.4
- 544GainesvilleFlorida 5.4
- 544Palm BayFlorida 5.4
- 544West PensacolaFlorida 5.4
- 544WeirtonWest Virginia 5.4
- 544YumaArizona 5.4
- 544Thousand OaksCalifornia 5.4
- 544AlbanyOregon 5.4
- 544ShorelineWashington 5.4
- 544Walla WallaWashington 5.4
- 544La Crescenta-Montroselow-cost sensorsCalifornia 5.4
- 556Coconut CreekFlorida 5.3
- 556WestonFlorida 5.3
- 556Roanoke RapidsNorth Carolina 5.3
- 556TaylorTexas 5.3
- 556BrocktonMassachusetts 5.3
- 556LynnMassachusetts 5.3
- 556DenverColorado 5.3
- 563New OrleansLouisiana 5.2
- 563Cedar ParkTexas 5.2
- 563WorcesterMassachusetts 5.2
- 563San Luis ObispoCalifornia 5.2
- 563BoiseIdaho 5.2
- 563PortlandOregon 5.2
- 563RedmondOregon 5.2
- 563Rapid CitySouth Dakota 5.2
- 563SeattleWashington 5.2
- 563SheridanWyoming 5.2
- 573GalvestonTexas 5.1
- 573SyracuseNew York 5.1
- 573ParadiseCalifornia 5.1
- 573Seasidelow-cost sensorsCalifornia 5.1
- 573Cedar CityUtah 5.1
- 578HagerstownMaryland 5.0
- 578Fall RiverMassachusetts 5.0
- 578SalinasCalifornia 5.0
- 578HobbsNew Mexico 5.0
- 578Carson CityNevada 5.0
- 578BeavertonOregon 5.0
- 578DallasOregon 5.0
- 578BellinghamWashington 5.0
- 578LaceyWashington 5.0
- 587PflugervilleTexas 4.9
- 587MilfordMassachusetts 4.9
- 587Moses LakeWashington 4.9
- 587SpokaneWashington 4.9
- 591Atlantic CityNew Jersey 4.8
- 591DerryNew Hampshire 4.8
- 591PortsmouthNew Hampshire 4.8
- 591GreshamOregon 4.8
- 595PleasantvilleNew Jersey 4.7
- 595PittsfieldMassachusetts 4.7
- 595QuincyMassachusetts 4.7
- 595Dodge CityKansas 4.7
- 595Twin FallsIdaho 4.7
- 595Brigham CityUtah 4.7
- 595North OgdenUtah 4.7
- 595CentraliaWashington 4.7
- 603Coos BayOregon 4.6
- 603BremertonWashington 4.6
- 603LongviewWashington 4.6
- 603Salmon CreekWashington 4.6
- 603Inglewood-Finn Hilllow-cost sensorsWashington 4.6
- 608FairhopeAlabama 4.5
- 608Newtonlow-cost sensorsMassachusetts 4.5
- 608Lakewoodlow-cost sensorsColorado 4.5
- 608HurricaneUtah 4.5
- 612Goletalow-cost sensorsCalifornia 4.4
- 612WindsorColorado 4.4
- 612CanbyOregon 4.4
- 615TruckeeCalifornia 4.3
- 615Apache JunctionArizona 4.3
- 615Spokane ValleyWashington 4.3
- 615HonoluluHawaii 4.3
- 619CoventryRhode Island 4.2
- 619Sioux FallsSouth Dakota 4.2
- 619Arvadalow-cost sensorsColorado 4.2
- 619EnterpriseNevada 4.2
- 619HerrimanUtah 4.2
- 619HiloHawaii 4.2
- 625PuebloColorado 4.1
- 625CorvallisOregon 4.1
- 625KahuluiHawaii 4.1
- 628Arroyo GrandeCalifornia 4.0
- 628HollisterCalifornia 4.0
- 628LancasterCalifornia 4.0
- 628LubbockTexas 4.0
- 628MoscowIdaho 4.0
- 628Summerlin SouthNevada 4.0
- 634MarquetteMichigan 3.8
- 634NipomoCalifornia 3.8
- 634Kirklandlow-cost sensorsWashington 3.8
- 637PocatelloIdaho 3.7
- 637BurienWashington 3.7
- 637KīheiHawaii 3.7
- 640Colorado SpringsColorado 3.6
- 640HighlandUtah 3.6
- 640AberdeenWashington 3.6
- 643BanningCalifornia 3.5
- 643TooeleUtah 3.5
- 645Green ValleyArizona 3.4
- 645LittletonColorado 3.4
- 645Idaho FallsIdaho 3.4
- 645MissoulaMontana 3.4
- 649Grand IslandNebraska 3.3
- 649OrcuttCalifornia 3.3
- 649BoulderColorado 3.3
- 652Forest GroveOregon 3.2
- 653Las CrucesNew Mexico 3.1
- 653MesquiteNevada 3.1
- 655Oak HarborWashington 3.0
- 656Boulder CityNevada 2.9
- 657FillmoreCalifornia 2.8
- 657Ken CarylColorado 2.8
- 657Union Hill-Novelty Hilllow-cost sensorsWashington 2.8
- 660PullmanWashington 2.7
- 660Redmondlow-cost sensorsWashington 2.7
- 662BellevueWashington 2.5
- 663Bothelllow-cost sensorsWashington 2.4
- 663Rock SpringsWyoming 2.4
- 665Cañon CityColorado 2.3
- 666RidgecrestCalifornia 2.0
- 666LaramieWyoming 2.0
- 668LompocCalifornia 1.8
- 669CheyenneWyoming 1.6
- 670CasperWyoming 1.2
- 671Mount VernonWashington 1.0
- 672Oro Valleylow-cost sensorsArizona 0.4
- 673Parkerlow-cost sensorsColorado 0.1
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+