SmogRank / Countries / United States / August 2026
Most polluted cities in United States, August 2026
667 cities in United States ranked by their average PM2.5 over the 31 days. Worst: Wenatchee at 44.6 µg/m³, #17 of 2,312 cities in the world. Cleanest: Oro Valley at 0.3. A city needs measurements on 70% of the days to be ranked.
- 1WenatcheeWashington 44.6
- 2Moses LakeWashington 28.7
- 3Spokane ValleyWashington 27.5
- 4Walla WallaWashington 27.1
- 5SpokaneWashington 27.0
- 6CalexicoCalifornia 26.5
- 7NampaIdaho 26.2
- 8RedmondOregon 24.8
- 9Coeur d'AleneIdaho 23.9
- 10PendletonOregon 23.5
- 11BoiseIdaho 23.1
- 12YakimaWashington 22.5
- 13EllensburgWashington 22.4
- 14MeridianIdaho 21.9
- 15LewistonIdaho 21.8
- 16Great FallsMontana 20.9
- 17KennewickWashington 20.0
- 18MissoulaMontana 19.4
- 19PascoWashington 19.2
- 20SunnysideWashington 19.0
- 21Tri-CitiesWashington 18.7
- 22PullmanWashington 18.2
- 23BozemanMontana 17.9
- 24HermistonOregon 17.8
- 25MoscowIdaho 17.6
- 26The DallesOregon 17.5
- 27ButteMontana 17.4
- 28Wheatonlow-cost sensorsIllinois 17.2
- 29Twin FallsIdaho 16.7
- 30PerrysburgOhio 15.6
- 30Oconomowoclow-cost sensorsWisconsin 15.6
- 30BendOregon 15.6
- 30Redmondlow-cost sensorsWashington 15.6
- 34BillingsMontana 15.5
- 35HelenaMontana 14.8
- 36SheridanWyoming 14.7
- 37Wake Forestlow-cost sensorsNorth Carolina 14.6
- 37Monroelow-cost sensorsWashington 14.6
- 39Jurupa ValleyCalifornia 14.5
- 40LaredoTexas 14.4
- 40CorcoranCalifornia 14.4
- 42EugeneOregon 14.1
- 43HanfordCalifornia 13.9
- 43CanbyOregon 13.9
- 45WhittierCalifornia 13.7
- 46DallasTexas 13.6
- 47FontanaCalifornia 13.5
- 48RiversideCalifornia 13.3
- 49ShreveportLouisiana 13.2
- 49MissionTexas 13.2
- 49El PasoTexas 13.2
- 52WyomingMichigan 13.1
- 52Casa GrandeArizona 13.1
- 54Los AngelesCalifornia 13.0
- 54VisaliaCalifornia 13.0
- 56Brookfieldlow-cost sensorsWisconsin 12.9
- 56Arvadalow-cost sensorsColorado 12.9
- 58Evanstonlow-cost sensorsIllinois 12.6
- 58AltamontOregon 12.6
- 58Union Hill-Novelty Hilllow-cost sensorsWashington 12.6
- 61West MemphisArkansas 12.5
- 61Franklin ParkIllinois 12.5
- 63BaytownTexas 12.4
- 63FresnoCalifornia 12.4
- 65Little RockArkansas 12.3
- 65TulsaOklahoma 12.3
- 65BrownsvilleTexas 12.3
- 65Corpus ChristiTexas 12.3
- 65LimaOhio 12.3
- 65GlendoraCalifornia 12.3
- 65TigardOregon 12.3
- 72Kendale LakesFlorida 12.2
- 73MiddletownOhio 12.1
- 73ClovisCalifornia 12.1
- 73Oregon CityOregon 12.1
- 76AustinTexas 12.0
- 76BridgeviewIllinois 12.0
- 78Granite CityIllinois 11.9
- 78EdinburgTexas 11.9
- 78Calumet CityIllinois 11.9
- 78Ann Arborlow-cost sensorsMichigan 11.9
- 82MonroeLouisiana 11.8
- 82Oak LawnIllinois 11.8
- 82GreshamOregon 11.8
- 85BurbankCalifornia 11.7
- 85PocatelloIdaho 11.7
- 87MankatoMinnesota 11.6
- 88SpringdaleArkansas 11.5
- 88ThorntonColorado 11.5
- 88Rapid CitySouth Dakota 11.5
- 91DentonTexas 11.4
- 91NapervilleIllinois 11.4
- 91RochesterMinnesota 11.4
- 91ComptonCalifornia 11.4
- 91MaderaCalifornia 11.4
- 91Eagle PassTexas 11.4
- 97MaconGeorgia 11.3
- 97WichitaKansas 11.3
- 97PasadenaTexas 11.3
- 97BismarckNorth Dakota 11.3
- 101Upper AltonIllinois 11.2
- 101Fort WorthTexas 11.2
- 101Royal Oaklow-cost sensorsMichigan 11.2
- 101AlbanyOregon 11.2
- 105Deer ParkTexas 11.1
- 105HoustonTexas 11.1
- 105ElginIllinois 11.1
- 105NorthbrookIllinois 11.1
- 105BakersfieldCalifornia 11.1
- 105LongmontColorado 11.1
- 105Idaho FallsIdaho 11.1
- 112DoltonIllinois 11.0
- 112RockfordIllinois 11.0
- 112BurnsvilleMinnesota 11.0
- 112San Luis ObispoCalifornia 11.0
- 116San AntonioTexas 10.9
- 116TexarkanaTexas 10.9
- 116Fort DodgeIowa 10.9
- 116Lake ElsinoreCalifornia 10.9
- 116San DiegoCalifornia 10.9
- 116Fort CollinsColorado 10.9
- 122South LaurelMaryland 10.8
- 122Live OakTexas 10.8
- 122BrookfieldIllinois 10.8
- 122PeoriaIllinois 10.8
- 122MinneapolisMinnesota 10.8
- 122AnaheimCalifornia 10.8
- 122Mission ViejoCalifornia 10.8
- 122GilletteWyoming 10.8
- 130Kansas CityKansas 10.7
- 130McAlesterOklahoma 10.7
- 130PhiladelphiaPennsylvania 10.7
- 130GalvestonTexas 10.7
- 130Chula VistaCalifornia 10.7
- 130El CajonCalifornia 10.7
- 130BeavertonOregon 10.7
- 130North Creeklow-cost sensorsWashington 10.7
- 138Michigan CityIndiana 10.6
- 138ClevelandOhio 10.6
- 140DerbyKansas 10.5
- 140TopekaKansas 10.5
- 140Camdenlow-cost sensorsNew Jersey 10.5
- 140SpartanburgSouth Carolina 10.5
- 140Iowa CityIowa 10.5
- 140ChicagoIllinois 10.5
- 140WarrenOhio 10.5
- 140LancasterPennsylvania 10.5
- 140MercedCalifornia 10.5
- 140West JordanUtah 10.5
- 150DecaturIllinois 10.4
- 150IndianapolisIndiana 10.4
- 150EdmondOklahoma 10.4
- 150HammondIndiana 10.4
- 150CantonOhio 10.4
- 150WestervilleOhio 10.4
- 150Eau ClaireWisconsin 10.4
- 150Santa ClaritaCalifornia 10.4
- 150Inglewood-Finn Hilllow-cost sensorsWashington 10.4
- 159AtlantaGeorgia 10.3
- 159ShakopeeMinnesota 10.3
- 159OregonOhio 10.3
- 159IndioCalifornia 10.3
- 159Santa Monicalow-cost sensorsCalifornia 10.3
- 159MillcreekUtah 10.3
- 165FlorenceSouth Carolina 10.2
- 165BartlettTennessee 10.2
- 165Missouri CityTexas 10.2
- 165SaginawTexas 10.2
- 165Cedar RapidsIowa 10.2
- 165ClintonIowa 10.2
- 165JolietIllinois 10.2
- 165Saint PaulMinnesota 10.2
- 165Torrancelow-cost sensorsCalifornia 10.2
- 165Bothelllow-cost sensorsWashington 10.2
- 175Mission BendTexas 10.1
- 175Elmwood ParkIllinois 10.1
- 175Long BeachCalifornia 10.1
- 175OceansideCalifornia 10.1
- 175Sunland ParkNew Mexico 10.1
- 175SocorroTexas 10.1
- 175Kirklandlow-cost sensorsWashington 10.1
- 182East Saint LouisIllinois 10.0
- 182OlatheKansas 10.0
- 182New OrleansLouisiana 10.0
- 182NorwoodOhio 10.0
- 182YorkPennsylvania 10.0
- 182WaterlooIowa 10.0
- 182KalamazooMichigan 10.0
- 182PittsburghPennsylvania 10.0
- 182West MifflinPennsylvania 10.0
- 182Green BayWisconsin 10.0
- 182SalemOregon 10.0
- 193MiamiFlorida 9.9
- 193Columbialow-cost sensorsMissouri 9.9
- 193PortsmouthOhio 9.9
- 193BlaineMinnesota 9.9
- 193WaukeshaWisconsin 9.9
- 193OrcuttCalifornia 9.9
- 193DenverColorado 9.9
- 200FayettevilleNorth Carolina 9.8
- 200JenksOklahoma 9.8
- 200North CharlestonSouth Carolina 9.8
- 200Apple ValleyMinnesota 9.8
- 200Middletonlow-cost sensorsWisconsin 9.8
- 200Inglewoodlow-cost sensorsCalifornia 9.8
- 200PowayCalifornia 9.8
- 200RichmondCalifornia 9.8
- 200Loganlow-cost sensorsUtah 9.8
- 200MidwayFlorida 9.8
- 210EvansvilleIndiana 9.7
- 210LouisvilleKentucky 9.7
- 210ConroeTexas 9.7
- 210La PorteTexas 9.7
- 210AuroraIllinois 9.7
- 210TempeArizona 9.7
- 210TooeleUtah 9.7
- 217CincinnatiOhio 9.6
- 217ColumbusOhio 9.6
- 217Ponca CityOklahoma 9.6
- 217Fort WayneIndiana 9.6
- 217MedinaOhio 9.6
- 217WilkinsburgPennsylvania 9.6
- 217OdessaTexas 9.6
- 217WindsorColorado 9.6
- 217HillsboroOregon 9.6
- 226Fort LauderdaleFlorida 9.5
- 226SpringfieldIllinois 9.5
- 226PennsaukenNew Jersey 9.5
- 226MooreOklahoma 9.5
- 226ChattanoogaTennessee 9.5
- 226JacksonTennessee 9.5
- 226Grand RapidsMichigan 9.5
- 226West FargoNorth Dakota 9.5
- 226PortervilleCalifornia 9.5
- 226Brigham CityUtah 9.5
- 236JacksonMississippi 9.4
- 236SpringfieldOhio 9.4
- 236LawtonOklahoma 9.4
- 236Oklahoma CityOklahoma 9.4
- 236NashvilleTennessee 9.4
- 236BeltonTexas 9.4
- 236CaryIllinois 9.4
- 236East ChicagoIndiana 9.4
- 236JenisonMichigan 9.4
- 236Saint MichaelMinnesota 9.4
- 236Abingtonlow-cost sensorsPennsylvania 9.4
- 236Pasadenalow-cost sensorsCalifornia 9.4
- 236San JoseCalifornia 9.4
- 236Simi ValleyCalifornia 9.4
- 236PortlandOregon 9.4
- 251MontgomeryAlabama 9.3
- 251JeffersonvilleIndiana 9.3
- 251LeawoodKansas 9.3
- 251Valley StationKentucky 9.3
- 251St. LouisMissouri 9.3
- 251HernandoMississippi 9.3
- 251DaytonOhio 9.3
- 251Saint AndrewsSouth Carolina 9.3
- 251College StationTexas 9.3
- 251MolineIllinois 9.3
- 251South BendIndiana 9.3
- 251LansingMichigan 9.3
- 251PhoenixArizona 9.3
- 251GreeleyColorado 9.3
- 251AuburnWashington 9.3
- 266GahannaOhio 9.2
- 266AppletonWisconsin 9.2
- 266TurlockCalifornia 9.2
- 266BoulderColorado 9.2
- 266WoodburnOregon 9.2
- 266Spanish ForkUtah 9.2
- 272DavenportIowa 9.1
- 272ChampaignIllinois 9.1
- 272Des PlainesIllinois 9.1
- 272Saint CloudMinnesota 9.1
- 272CorvallisOregon 9.1
- 272BountifulUtah 9.1
- 272KentWashington 9.1
- 279HueytownAlabama 9.0
- 279JasperIndiana 9.0
- 279SulphurLouisiana 9.0
- 279MuncieIndiana 9.0
- 279LincolnNebraska 9.0
- 279SteubenvilleOhio 9.0
- 279South MilwaukeeWisconsin 9.0
- 279BanningCalifornia 9.0
- 279DallasOregon 9.0
- 288Ferry PassFlorida 8.9
- 288New AlbanyIndiana 8.9
- 288Saint MatthewsKentucky 8.9
- 288Cedar ParkTexas 8.9
- 288Des MoinesIowa 8.9
- 288ZionIllinois 8.9
- 288DearbornMichigan 8.9
- 288LebanonPennsylvania 8.9
- 288WeirtonWest Virginia 8.9
- 288LittletonColorado 8.9
- 288West Valley CityUtah 8.9
- 288RentonWashington 8.9
- 300WashingtonDistrict of Columbia 8.8
- 300DoverDelaware 8.8
- 300Bonita SpringsFlorida 8.8
- 300Warner RobinsGeorgia 8.8
- 300ChambersburgPennsylvania 8.8
- 300ChesapeakeVirginia 8.8
- 300AnkenyIowa 8.8
- 300ToledoOhio 8.8
- 300HarrisburgPennsylvania 8.8
- 300Huntington Beachlow-cost sensorsCalifornia 8.8
- 300Colorado SpringsColorado 8.8
- 300HerrimanUtah 8.8
- 300Candler-McAfeeGeorgia 8.8
- 313BirminghamAlabama 8.7
- 313Delray BeachFlorida 8.7
- 313OcalaFlorida 8.7
- 313JeffersontownKentucky 8.7
- 313MorrisvilleNorth Carolina 8.7
- 313DetroitMichigan 8.7
- 313ElizabethNew Jersey 8.7
- 313YoungstownOhio 8.7
- 313VancouverWashington 8.7
- 322Pompano BeachFlorida 8.6
- 322Ponte Vedra BeachFlorida 8.6
- 322AthensGeorgia 8.6
- 322LemayMissouri 8.6
- 322Winston-SalemNorth Carolina 8.6
- 322ElkhartIndiana 8.6
- 322JohnstownPennsylvania 8.6
- 322MesaArizona 8.6
- 322VictorvilleCalifornia 8.6
- 322HobbsNew Mexico 8.6
- 332AugustaGeorgia 8.5
- 332ValdostaGeorgia 8.5
- 332BaltimoreMaryland 8.5
- 332CharlottesvilleVirginia 8.5
- 332BloomingtonIllinois 8.5
- 332AkronOhio 8.5
- 332Shaker HeightsOhio 8.5
- 332Upper Saint ClairPennsylvania 8.5
- 332SuperiorWisconsin 8.5
- 332FillmoreCalifornia 8.5
- 332GlendaleArizona 8.5
- 332MagnaUtah 8.5
- 332Salt Lake CityUtah 8.5
- 332BellevueWashington 8.5
- 332Columbia CityWashington 8.5
- 332Salmon CreekWashington 8.5
- 332CasperWyoming 8.5
- 349DecaturAlabama 8.4
- 349GadsdenAlabama 8.4
- 349HuntsvilleAlabama 8.4
- 349Coconut CreekFlorida 8.4
- 349OwensboroKentucky 8.4
- 349Kansas CityMissouri 8.4
- 349Saint JosephMissouri 8.4
- 349PleasantvilleNew Jersey 8.4
- 349KnoxvilleTennessee 8.4
- 349HarrisonburgVirginia 8.4
- 349Cleveland HeightsOhio 8.4
- 349DuluthMinnesota 8.4
- 349McKeesportPennsylvania 8.4
- 349YumaArizona 8.4
- 349PuebloColorado 8.4
- 349OremUtah 8.4
- 349TacomaWashington 8.4
- 366Deerfield BeachFlorida 8.3
- 366BloomingtonIndiana 8.3
- 366ChalmetteLouisiana 8.3
- 366HendersonvilleTennessee 8.3
- 366SpringfieldVirginia 8.3
- 366AndersonIndiana 8.3
- 366Lincoln ParkMichigan 8.3
- 366BuffaloNew York 8.3
- 366BensalemPennsylvania 8.3
- 366MadisonWisconsin 8.3
- 366TruckeeCalifornia 8.3
- 377Palm CityFlorida 8.2
- 377GreenvilleNorth Carolina 8.2
- 377SouthfieldMichigan 8.2
- 377YpsilantiMichigan 8.2
- 377BrawleyCalifornia 8.2
- 377Ken CarylColorado 8.2
- 377AmarilloTexas 8.2
- 377LaramieWyoming 8.2
- 385PrichardAlabama 8.1
- 385TallahasseeFlorida 8.1
- 385KennerLouisiana 8.1
- 385HattiesburgMississippi 8.1
- 385CharlotteNorth Carolina 8.1
- 385ClemmonsNorth Carolina 8.1
- 385AshburnVirginia 8.1
- 385OmahaNebraska 8.1
- 385AltoonaPennsylvania 8.1
- 385ScrantonPennsylvania 8.1
- 385LivermoreCalifornia 8.1
- 385Yuba CityCalifornia 8.1
- 385Cañon CityColorado 8.1
- 385AshlandOregon 8.1
- 385North OgdenUtah 8.1
- 400WilmingtonDelaware 8.0
- 400DavieFlorida 8.0
- 400VeniceFlorida 8.0
- 400Baton RougeLouisiana 8.0
- 400GulfportMississippi 8.0
- 400Short PumpVirginia 8.0
- 400TaylorMichigan 8.0
- 400HermitagePennsylvania 8.0
- 400State CollegePennsylvania 8.0
- 400PaysonArizona 8.0
- 400SalinasCalifornia 8.0
- 400SeattleWashington 8.0
- 412BearDelaware 7.9
- 412LexingtonNorth Carolina 7.9
- 412PortlandMaine 7.9
- 412EwingNew Jersey 7.9
- 412TrentonNew Jersey 7.9
- 412WatertownSouth Dakota 7.9
- 412Parkerlow-cost sensorsColorado 7.9
- 412RenoNevada 7.9
- 412McMinnvilleOregon 7.9
- 412CentraliaWashington 7.9
- 422SavannahGeorgia 7.8
- 422ElizabethtownKentucky 7.8
- 422Lexington-FayetteKentucky 7.8
- 422ClaytonNorth Carolina 7.8
- 422Roanoke RapidsNorth Carolina 7.8
- 422DyersburgTennessee 7.8
- 422Port HuronMichigan 7.8
- 422Jersey CityNew Jersey 7.8
- 422DublinOhio 7.8
- 422Weirton HeightsWest Virginia 7.8
- 422Tularelow-cost sensorsCalifornia 7.8
- 422BurienWashington 7.8
- 422ShorelineWashington 7.8
- 435PaducahKentucky 7.7
- 435FairhopeAlabama 7.7
- 435LafayetteLouisiana 7.7
- 435ArnoldMissouri 7.7
- 435SpringfieldMissouri 7.7
- 435AshevilleNorth Carolina 7.7
- 435HickoryNorth Carolina 7.7
- 435Atlantic CityNew Jersey 7.7
- 435ClarksvilleTennessee 7.7
- 435NewarkNew Jersey 7.7
- 435AllentownPennsylvania 7.7
- 435CarlislePennsylvania 7.7
- 435ReadingPennsylvania 7.7
- 435Forest GroveOregon 7.7
- 449LawrencevilleGeorgia 7.6
- 449NicholasvilleKentucky 7.6
- 449PascagoulaMississippi 7.6
- 449HopewellVirginia 7.6
- 449RichmondVirginia 7.6
- 449Rose HillVirginia 7.6
- 449NogalesArizona 7.6
- 449OxnardCalifornia 7.6
- 449MedfordOregon 7.6
- 458BessemerAlabama 7.5
- 458Fort SmithArkansas 7.5
- 458GainesvilleGeorgia 7.5
- 458AshlandKentucky 7.5
- 458GreensboroNorth Carolina 7.5
- 458ColumbiaTennessee 7.5
- 458MaryvilleTennessee 7.5
- 458CharlestonWest Virginia 7.5
- 458New York CityNew York 7.5
- 458Delanolow-cost sensorsCalifornia 7.5
- 458Goletalow-cost sensorsCalifornia 7.5
- 458MantecaCalifornia 7.5
- 458TemeculaCalifornia 7.5
- 458MilwaukieOregon 7.5
- 458RandolphNew Jersey 7.5
- 473Fort ThomasKentucky 7.4
- 473ScaggsvilleMaryland 7.4
- 473Toms RiverNew Jersey 7.4
- 473Bay CityMichigan 7.4
- 473MarquetteMichigan 7.4
- 473PatersonNew Jersey 7.4
- 479ValricoFlorida 7.3
- 479MasonOhio 7.3
- 479SalemVirginia 7.3
- 479FlintMichigan 7.3
- 479PainesvilleOhio 7.3
- 479BridgeportConnecticut 7.3
- 479AtascaderoCalifornia 7.3
- 479ParklandWashington 7.3
- 487Belle GladeFlorida 7.2
- 487University CityMissouri 7.2
- 487RaleighNorth Carolina 7.2
- 487East HamptonVirginia 7.2
- 487RoanokeVirginia 7.2
- 487Grand IslandNebraska 7.2
- 487Arroyo GrandeCalifornia 7.2
- 487DavisCalifornia 7.2
- 487Spanish SpringsNevada 7.2
- 487BremertonWashington 7.2
- 487MarysvilleWashington 7.2
- 498NewarkDelaware 7.1
- 498Oak RidgeFlorida 7.1
- 498ElktonMaryland 7.1
- 498GreenvilleSouth Carolina 7.1
- 498BristolVirginia 7.1
- 498El CentroCalifornia 7.1
- 498Grants PassOregon 7.1
- 498HighlandUtah 7.1
- 506JacksonvilleFlorida 7.0
- 506RaymoreMissouri 7.0
- 506South VinelandNew Jersey 7.0
- 506BrocktonMassachusetts 7.0
- 506BethlehemPennsylvania 7.0
- 506GaltCalifornia 7.0
- 506San LeandroCalifornia 7.0
- 506Santa CruzCalifornia 7.0
- 506Thousand OaksCalifornia 7.0
- 506CheyenneWyoming 7.0
- 516WellingtonFlorida 6.9
- 516ChesterPennsylvania 6.9
- 516WaterburyConnecticut 6.9
- 516Fort LeeNew Jersey 6.9
- 516LincolnCalifornia 6.9
- 521West PensacolaFlorida 6.8
- 521LebanonOhio 6.8
- 521CookevilleTennessee 6.8
- 521HartfordConnecticut 6.8
- 521LindenNew Jersey 6.8
- 521FlagstaffArizona 6.8
- 521BerkeleyCalifornia 6.8
- 521Las CrucesNew Mexico 6.8
- 521LubbockTexas 6.8
- 521BellinghamWashington 6.8
- 531HagerstownMaryland 6.7
- 531SewellNew Jersey 6.7
- 531DanburyConnecticut 6.7
- 531New BrunswickNew Jersey 6.7
- 531Los Banoslow-cost sensorsCalifornia 6.7
- 531StocktonCalifornia 6.7
- 531RoseburgOregon 6.7
- 531LongviewWashington 6.7
- 531BadgerAlaska 6.7
- 540BartowFlorida 6.6
- 540ColumbusGeorgia 6.6
- 540Hunt ValleyMaryland 6.6
- 540LibertyMissouri 6.6
- 540MuscatineIowa 6.6
- 540EastpointeMichigan 6.6
- 540EriePennsylvania 6.6
- 540VallejoCalifornia 6.6
- 540Four CornersFlorida 6.6
- 549Daytona BeachFlorida 6.5
- 549AlbanyGeorgia 6.5
- 549New HavenConnecticut 6.5
- 549TucsonArizona 6.5
- 549NipomoCalifornia 6.5
- 549RidgecrestCalifornia 6.5
- 549RosevilleCalifornia 6.5
- 549Cedar CityUtah 6.5
- 549Oxon Hill-GlassmanorMaryland 6.5
- 558GainesvilleFlorida 6.4
- 558Palm BayFlorida 6.4
- 558St. PetersburgFlorida 6.4
- 558Winter ParkFlorida 6.4
- 558EdgewoodMaryland 6.4
- 558White OakOhio 6.4
- 558KingsportTennessee 6.4
- 558HolbrookNew York 6.4
- 558Casas AdobesArizona 6.4
- 558ConcordCalifornia 6.4
- 558Arden-ArcadeCalifornia 6.4
- 569BrunswickGeorgia 6.3
- 569SpringfieldMassachusetts 6.3
- 569GilroyCalifornia 6.3
- 569ParadiseCalifornia 6.3
- 573RochesterNew York 6.2
- 573Las VegasNevada 6.2
- 573Picnic Point-North LynnwoodWashington 6.2
- 576OrlandoFlorida 6.1
- 576McDonoughGeorgia 6.1
- 576RedfordMichigan 6.1
- 576BellevueNebraska 6.1
- 576La VistaNebraska 6.1
- 576BayonneNew Jersey 6.1
- 576RutlandVermont 6.1
- 576UkiahCalifornia 6.1
- 584Lake MaryFlorida 6.0
- 584TampaFlorida 6.0
- 584New LondonConnecticut 6.0
- 584LafayetteIndiana 6.0
- 584BostonMassachusetts 6.0
- 584BrookingsSouth Dakota 6.0
- 590Fall RiverMassachusetts 5.9
- 590AugustaMaine 5.9
- 590AlbanyNew York 5.9
- 590ModestoCalifornia 5.9
- 590South ValleyNew Mexico 5.9
- 590MesquiteNevada 5.9
- 590LaceyWashington 5.9
- 597SarasotaFlorida 5.8
- 597DerryNew Hampshire 5.8
- 597PortsmouthNew Hampshire 5.8
- 597NorristownPennsylvania 5.8
- 597PawtucketRhode Island 5.8
- 597OaklandCalifornia 5.8
- 597SacramentoCalifornia 5.8
- 604Safety HarborFlorida 5.7
- 604MilfordMassachusetts 5.7
- 604SyracuseNew York 5.7
- 604LancasterCalifornia 5.7
- 604AlbuquerqueNew Mexico 5.7
- 604Carson CityNevada 5.7
- 604Mount VernonWashington 5.7
- 604Rock SpringsWyoming 5.7
- 612Lexingtonlow-cost sensorsMassachusetts 5.6
- 612LowellMassachusetts 5.6
- 612LynnMassachusetts 5.6
- 612PittsfieldMassachusetts 5.6
- 612TracyCalifornia 5.6
- 612Rio RanchoNew Mexico 5.6
- 612Boulder CityNevada 5.6
- 612ReddingCalifornia 5.6
- 620DurhamNorth Carolina 5.5
- 620KeeneNew Hampshire 5.5
- 622FraminghamMassachusetts 5.4
- 622GreenfieldMassachusetts 5.4
- 622QuincyMassachusetts 5.4
- 622WorcesterMassachusetts 5.4
- 622HollisterCalifornia 5.4
- 622EnterpriseNevada 5.4
- 622HendersonNevada 5.4
- 622Spring ValleyNevada 5.4
- 622Port AngelesWashington 5.4
- 631AberdeenSouth Dakota 5.3
- 632LewistonMaine 5.2
- 632Sioux FallsSouth Dakota 5.2
- 632MaranaArizona 5.2
- 635ChicoCalifornia 5.1
- 635San FranciscoCalifornia 5.1
- 637HaverhillMassachusetts 5.0
- 637North ChicopeeMassachusetts 5.0
- 637ProvidenceRhode Island 5.0
- 637HurricaneUtah 5.0
- 637Summerlin SouthNevada 5.0
- 642BangorMaine 4.9
- 642Encinitaslow-cost sensorsCalifornia 4.9
- 644East LakeFlorida 4.8
- 644BurlingtonVermont 4.8
- 644FolsomCalifornia 4.8
- 647Palo Altolow-cost sensorsCalifornia 4.7
- 648UticaNew York 4.5
- 649NewburghNew York 4.4
- 649VacavilleCalifornia 4.4
- 649Coos BayOregon 4.4
- 652AberdeenWashington 4.1
- 652AnacortesWashington 4.1
- 654Green ValleyArizona 4.0
- 654LompocCalifornia 4.0
- 654San RafaelCalifornia 4.0
- 654Santa RosaCalifornia 4.0
- 654KīheiHawaii 4.0
- 654FairbanksAlaska 4.0
- 660White PlainsNew York 3.7
- 661RockvilleMaryland 3.6
- 662LaconiaNew Hampshire 3.4
- 662HiloHawaii 3.4
- 664HonoluluHawaii 3.0
- 665CoventryRhode Island 2.6
- 666AnchorageAlaska 2.5
- 667Oro Valleylow-cost sensorsArizona 0.3
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+