SmogRank / Countries / United States / January 2026
Most polluted cities in United States, January 2026
681 cities in United States ranked by their average PM2.5 over the 31 days. Worst: Delano at 32.6 µg/m³, #114 of 2,047 cities in the world. Cleanest: Parker at 0.2. A city needs measurements on 70% of the days to be ranked.
- 1Delanolow-cost sensorsCalifornia 32.6
- 2Tularelow-cost sensorsCalifornia 32.0
- 3Elk Grovelow-cost sensorsCalifornia 24.1
- 4BakersfieldCalifornia 23.8
- 5VisaliaCalifornia 20.4
- 6FresnoCalifornia 20.0
- 7Florinlow-cost sensorsCalifornia 19.6
- 8ModestoCalifornia 19.5
- 9HanfordCalifornia 17.9
- 10BadgerAlaska 17.5
- 11MedfordOregon 17.2
- 12CorcoranCalifornia 17.1
- 13StocktonCalifornia 16.6
- 14FairbanksAlaska 16.4
- 15MillcreekUtah 15.7
- 16WhittierCalifornia 15.6
- 17Arden-ArcadeCalifornia 15.3
- 18NogalesArizona 15.0
- 18MaderaCalifornia 15.0
- 20PortervilleCalifornia 14.9
- 21SacramentoCalifornia 14.8
- 21WoodlandCalifornia 14.8
- 23Huntington Beachlow-cost sensorsCalifornia 14.5
- 24MantecaCalifornia 14.4
- 25YakimaWashington 14.3
- 26MercedCalifornia 14.2
- 27ValdostaGeorgia 14.1
- 28AugustaGeorgia 14.0
- 29RedfordMichigan 13.9
- 30ComptonCalifornia 13.8
- 30Hawthornelow-cost sensorsCalifornia 13.8
- 30NampaIdaho 13.8
- 33Yuba CityCalifornia 13.7
- 34Camdenlow-cost sensorsNew Jersey 13.6
- 35ClovisCalifornia 13.4
- 36MaconGeorgia 13.3
- 36West JordanUtah 13.3
- 38West Valley CityUtah 13.2
- 39OaklandCalifornia 13.1
- 40LexingtonNorth Carolina 13.0
- 41PhoenixArizona 12.9
- 42McAlesterOklahoma 12.8
- 42ChicoCalifornia 12.8
- 42TurlockCalifornia 12.8
- 42AltamontOregon 12.8
- 42Grants PassOregon 12.8
- 47CalexicoCalifornia 12.6
- 47Las VegasNevada 12.6
- 49HoustonTexas 12.5
- 50YorkPennsylvania 12.3
- 50RosevilleCalifornia 12.3
- 50South San Franciscolow-cost sensorsCalifornia 12.3
- 50VallejoCalifornia 12.3
- 54PortsmouthOhio 12.2
- 54Jurupa ValleyCalifornia 12.2
- 54PendletonOregon 12.2
- 57Royal Oaklow-cost sensorsMichigan 11.9
- 57LincolnCalifornia 11.9
- 57Salt Lake CityUtah 11.9
- 57SunnysideWashington 11.9
- 61LawrencevilleGeorgia 11.8
- 61Abingtonlow-cost sensorsPennsylvania 11.8
- 61Carsonlow-cost sensorsCalifornia 11.8
- 61San JoseCalifornia 11.8
- 61El PasoTexas 11.8
- 61ParklandWashington 11.8
- 67PaysonArizona 11.7
- 68Wake Forestlow-cost sensorsNorth Carolina 11.6
- 69RiversideCalifornia 11.5
- 69San FranciscoCalifornia 11.5
- 69AuburnWashington 11.5
- 72GaltCalifornia 11.4
- 73LancasterPennsylvania 11.3
- 73RenoNevada 11.3
- 75MissionTexas 11.2
- 75DavisCalifornia 11.2
- 77San AntonioTexas 11.1
- 77LebanonPennsylvania 11.1
- 77Palo Altolow-cost sensorsCalifornia 11.1
- 77EugeneOregon 11.1
- 81RoseburgOregon 11.0
- 82SavannahGeorgia 10.9
- 82Long BeachCalifornia 10.9
- 82WenatcheeWashington 10.9
- 85Missouri CityTexas 10.8
- 85HillsboroOregon 10.8
- 87SpartanburgSouth Carolina 10.7
- 88GainesvilleGeorgia 10.6
- 88GreenvilleSouth Carolina 10.6
- 88BaytownTexas 10.6
- 88PasadenaTexas 10.6
- 88WaterlooIowa 10.6
- 88UkiahCalifornia 10.6
- 88SalemOregon 10.6
- 88The DallesOregon 10.6
- 96PortlandMaine 10.5
- 96Inglewoodlow-cost sensorsCalifornia 10.5
- 96SocorroTexas 10.5
- 96HermistonOregon 10.5
- 100MiddletownOhio 10.4
- 100FlorenceSouth Carolina 10.4
- 102TallahasseeFlorida 10.3
- 102AlbanyGeorgia 10.3
- 102TexarkanaTexas 10.3
- 102AlbanyNew York 10.3
- 102AnaheimCalifornia 10.3
- 102RichmondCalifornia 10.3
- 102BountifulUtah 10.3
- 102OremUtah 10.3
- 102EllensburgWashington 10.3
- 102TacomaWashington 10.3
- 112Warner RobinsGeorgia 10.2
- 112PhiladelphiaPennsylvania 10.2
- 112ReadingPennsylvania 10.2
- 112Torrancelow-cost sensorsCalifornia 10.2
- 112LewistonIdaho 10.2
- 112AlbanyOregon 10.2
- 118WilmingtonDelaware 10.1
- 118NorwoodOhio 10.1
- 118LaredoTexas 10.1
- 118VacavilleCalifornia 10.1
- 118Columbia CityWashington 10.1
- 123NashvilleTennessee 10.0
- 124Little RockArkansas 9.9
- 124ColumbusGeorgia 9.9
- 124JeffersonvilleIndiana 9.9
- 124East RidgeTennessee 9.9
- 124ConroeTexas 9.9
- 124WestervilleOhio 9.9
- 124ReddingCalifornia 9.9
- 131Hunt ValleyMaryland 9.8
- 131MagnaUtah 9.8
- 131VancouverWashington 9.8
- 134JacksonMississippi 9.7
- 134PennsaukenNew Jersey 9.7
- 134HarrisburgPennsylvania 9.7
- 134RentonWashington 9.7
- 138FayettevilleNorth Carolina 9.6
- 138LafayetteIndiana 9.6
- 138BensalemPennsylvania 9.6
- 138Santa RosaCalifornia 9.6
- 138BoiseIdaho 9.6
- 143BrunswickGeorgia 9.5
- 143Valley StationKentucky 9.5
- 143EssexMaryland 9.5
- 143ChesterPennsylvania 9.5
- 143Live OakTexas 9.5
- 143BerkeleyCalifornia 9.5
- 143Great FallsMontana 9.5
- 143Port AngelesWashington 9.5
- 151BloomingtonIndiana 9.4
- 151Baton RougeLouisiana 9.4
- 151ShreveportLouisiana 9.4
- 151MooreOklahoma 9.4
- 151BrownsvilleTexas 9.4
- 151NorristownPennsylvania 9.4
- 151Oregon CityOregon 9.4
- 158LouisvilleKentucky 9.3
- 158ClemmonsNorth Carolina 9.3
- 158North CharlestonSouth Carolina 9.3
- 158ChattanoogaTennessee 9.3
- 158MuscatineIowa 9.3
- 158BayonneNew Jersey 9.3
- 164NewarkDelaware 9.2
- 164AthensGeorgia 9.2
- 164HattiesburgMississippi 9.2
- 164DurhamNorth Carolina 9.2
- 164DaytonOhio 9.2
- 164Saint AndrewsSouth Carolina 9.2
- 164Franklin ParkIllinois 9.2
- 164Fort WayneIndiana 9.2
- 164SteubenvilleOhio 9.2
- 164ToledoOhio 9.2
- 164CarlislePennsylvania 9.2
- 164CentraliaWashington 9.2
- 176Oklahoma CityOklahoma 9.1
- 176AustinTexas 9.1
- 176Mission BendTexas 9.1
- 176WyomingMichigan 9.1
- 176San LeandroCalifornia 9.1
- 176WoodburnOregon 9.1
- 182IndianapolisIndiana 9.0
- 182SulphurLouisiana 9.0
- 182West MifflinPennsylvania 9.0
- 182San DiegoCalifornia 9.0
- 186OcalaFlorida 8.9
- 186WichitaKansas 8.9
- 186CincinnatiOhio 8.9
- 186BethlehemPennsylvania 8.9
- 186Los AngelesCalifornia 8.9
- 186North OgdenUtah 8.9
- 192BirminghamAlabama 8.8
- 192Fort SmithArkansas 8.8
- 192AshlandKentucky 8.8
- 192OwensboroKentucky 8.8
- 192SpringfieldMissouri 8.8
- 192CharlotteNorth Carolina 8.8
- 192ColumbusOhio 8.8
- 192GreenfieldMassachusetts 8.8
- 192PerrysburgOhio 8.8
- 192AllentownPennsylvania 8.8
- 192Rio RanchoNew Mexico 8.8
- 203MontgomeryAlabama 8.7
- 203EvansvilleIndiana 8.7
- 203DerbyKansas 8.7
- 203BartlettTennessee 8.7
- 203Fort WorthTexas 8.7
- 203HolbrookNew York 8.7
- 203DublinOhio 8.7
- 203OregonOhio 8.7
- 203Redwood CityCalifornia 8.7
- 203ButteMontana 8.7
- 213ColumbusIndiana 8.6
- 213New AlbanyIndiana 8.6
- 213Winston-SalemNorth Carolina 8.6
- 213South MilwaukeeWisconsin 8.6
- 213FolsomCalifornia 8.6
- 213Coeur d'AleneIdaho 8.6
- 219JenksOklahoma 8.5
- 219HartfordConnecticut 8.5
- 219Wheatonlow-cost sensorsIllinois 8.5
- 219Fort LeeNew Jersey 8.5
- 219ProvidenceRhode Island 8.5
- 219BurbankCalifornia 8.5
- 219LivermoreCalifornia 8.5
- 219PleasantonCalifornia 8.5
- 219South Lake TahoeCalifornia 8.5
- 219PocatelloIdaho 8.5
- 219BendOregon 8.5
- 230MorrisvilleNorth Carolina 8.4
- 230SpringfieldVirginia 8.4
- 230Bay CityMichigan 8.4
- 230New York CityNew York 8.4
- 230UticaNew York 8.4
- 230ClevelandOhio 8.4
- 230TigardOregon 8.4
- 230SeattleWashington 8.4
- 230SpokaneWashington 8.4
- 230Walla WallaWashington 8.4
- 230MidwayFlorida 8.4
- 241Saint MatthewsKentucky 8.3
- 241KennerLouisiana 8.3
- 241HernandoMississippi 8.3
- 241RaleighNorth Carolina 8.3
- 241Corpus ChristiTexas 8.3
- 241Evanstonlow-cost sensorsIllinois 8.3
- 241MuncieIndiana 8.3
- 241White PlainsNew York 8.3
- 241MedinaOhio 8.3
- 241Moses LakeWashington 8.3
- 251BaltimoreMaryland 8.2
- 251GulfportMississippi 8.2
- 251GreensboroNorth Carolina 8.2
- 251WaterburyConnecticut 8.2
- 251HollandMichigan 8.2
- 251NewburghNew York 8.2
- 251GahannaOhio 8.2
- 251AlbuquerqueNew Mexico 8.2
- 251Brigham CityUtah 8.2
- 260DoverDelaware 8.1
- 260EdgewoodMaryland 8.1
- 260HickoryNorth Carolina 8.1
- 260LebanonOhio 8.1
- 260Calumet CityIllinois 8.1
- 260DoltonIllinois 8.1
- 260Ann Arborlow-cost sensorsMichigan 8.1
- 260DetroitMichigan 8.1
- 260KeeneNew Hampshire 8.1
- 260AkronOhio 8.1
- 260BrookingsSouth Dakota 8.1
- 260AtascaderoCalifornia 8.1
- 260ConcordCalifornia 8.1
- 260FontanaCalifornia 8.1
- 260MartinezCalifornia 8.1
- 260LaceyWashington 8.1
- 260LongviewWashington 8.1
- 277Ponte Vedra BeachFlorida 8.0
- 277JasperIndiana 8.0
- 277PascagoulaMississippi 8.0
- 277HendersonvilleTennessee 8.0
- 277BrookfieldIllinois 8.0
- 277AndersonIndiana 8.0
- 277EwingNew Jersey 8.0
- 277CantonOhio 8.0
- 277San RafaelCalifornia 8.0
- 277Watsonvillelow-cost sensorsCalifornia 8.0
- 277Candler-McAfeeGeorgia 8.0
- 277Tri-CitiesWashington 8.0
- 289HuntsvilleAlabama 7.9
- 289WashingtonDistrict of Columbia 7.9
- 289Granite CityIllinois 7.9
- 289Terre HauteIndiana 7.9
- 289ElizabethtownKentucky 7.9
- 289MonroeLouisiana 7.9
- 289South VinelandNew Jersey 7.9
- 289MasonOhio 7.9
- 289DanburyConnecticut 7.9
- 289Des PlainesIllinois 7.9
- 289ScrantonPennsylvania 7.9
- 289El CajonCalifornia 7.9
- 301SpringdaleArkansas 7.8
- 301BearDelaware 7.8
- 301JacksonvilleFlorida 7.8
- 301ColumbiaTennessee 7.8
- 301SpringfieldMassachusetts 7.8
- 301JohnstownPennsylvania 7.8
- 301WilkinsburgPennsylvania 7.8
- 301SuperiorWisconsin 7.8
- 301Twin FallsIdaho 7.8
- 301MilwaukieOregon 7.8
- 301Picnic Point-North LynnwoodWashington 7.8
- 312HueytownAlabama 7.7
- 312PrichardAlabama 7.7
- 312St. PetersburgFlorida 7.7
- 312TampaFlorida 7.7
- 312East Saint LouisIllinois 7.7
- 312JeffersontownKentucky 7.7
- 312St. LouisMissouri 7.7
- 312White OakOhio 7.7
- 312EdmondOklahoma 7.7
- 312LawtonOklahoma 7.7
- 312BeltonTexas 7.7
- 312SaginawTexas 7.7
- 312GaryIndiana 7.7
- 312HaverhillMassachusetts 7.7
- 312DearbornMichigan 7.7
- 312WarrenOhio 7.7
- 312PittsburghPennsylvania 7.7
- 312Spokane ValleyWashington 7.7
- 330West MemphisArkansas 7.6
- 330ElktonMaryland 7.6
- 330LemayMissouri 7.6
- 330Toms RiverNew Jersey 7.6
- 330SpringfieldOhio 7.6
- 330KokomoIndiana 7.6
- 330New CityNew York 7.6
- 330GilroyCalifornia 7.6
- 330Lomitalow-cost sensorsCalifornia 7.6
- 330Grand JunctionColorado 7.6
- 330ShorelineWashington 7.6
- 341BessemerAlabama 7.5
- 341OrlandoFlorida 7.5
- 341ClarksvilleTennessee 7.5
- 341KnoxvilleTennessee 7.5
- 341HuntingtonWest Virginia 7.5
- 341Lincoln ParkMichigan 7.5
- 341LindenNew Jersey 7.5
- 341Shaker HeightsOhio 7.5
- 341GlendaleArizona 7.5
- 341TracyCalifornia 7.5
- 351GadsdenAlabama 7.4
- 351Safety HarborFlorida 7.4
- 351Upper AltonIllinois 7.4
- 351Lexington-FayetteKentucky 7.4
- 351AshevilleNorth Carolina 7.4
- 351ClaytonNorth Carolina 7.4
- 351Ponca CityOklahoma 7.4
- 351CorsicanaTexas 7.4
- 351AshburnVirginia 7.4
- 351HarrisonburgVirginia 7.4
- 351Elmwood ParkIllinois 7.4
- 351KalamazooMichigan 7.4
- 363Oak RidgeFlorida 7.3
- 363NicholasvilleKentucky 7.3
- 363ChalmetteLouisiana 7.3
- 363New OrleansLouisiana 7.3
- 363Columbialow-cost sensorsMissouri 7.3
- 363College StationTexas 7.3
- 363ChesapeakeVirginia 7.3
- 363RichmondVirginia 7.3
- 363Northglennlow-cost sensorsColorado 7.3
- 363Eagle PassTexas 7.3
- 363HelenaMontana 7.3
- 374DecaturAlabama 7.2
- 374FairhopeAlabama 7.2
- 374TrussvilleAlabama 7.2
- 374ValricoFlorida 7.2
- 374Kansas CityKansas 7.2
- 374JacksonTennessee 7.2
- 374La PorteTexas 7.2
- 374Rose HillVirginia 7.2
- 374ElkhartIndiana 7.2
- 374TaylorMichigan 7.2
- 374MinneapolisMinnesota 7.2
- 374Jersey CityNew Jersey 7.2
- 374Chula VistaCalifornia 7.2
- 387PaducahKentucky 7.1
- 387West PensacolaFlorida 7.1
- 387South LaurelMaryland 7.1
- 387ChicagoIllinois 7.1
- 387PeoriaIllinois 7.1
- 387LewistonMaine 7.1
- 387YoungstownOhio 7.1
- 387PawtucketRhode Island 7.1
- 387Eau ClaireWisconsin 7.1
- 387MilwaukeeWisconsin 7.1
- 387Sunland ParkNew Mexico 7.1
- 387GreeleyColorado 7.1
- 399Winter ParkFlorida 7.0
- 399AtlantaGeorgia 7.0
- 399OlatheKansas 7.0
- 399CharlottesvilleVirginia 7.0
- 399CharlestonWest Virginia 7.0
- 399ElginIllinois 7.0
- 399BostonMassachusetts 7.0
- 399Grand RapidsMichigan 7.0
- 399BridgeportConnecticut 7.0
- 399Santa CruzCalifornia 7.0
- 399BozemanMontana 7.0
- 399DallasOregon 7.0
- 399McMinnvilleOregon 7.0
- 399HerrimanUtah 7.0
- 399Inglewood-Finn Hilllow-cost sensorsWashington 7.0
- 414VeniceFlorida 6.9
- 414TopekaKansas 6.9
- 414Fort ThomasKentucky 6.9
- 414FraminghamMassachusetts 6.9
- 414EastpointeMichigan 6.9
- 414Port HuronMichigan 6.9
- 414PatersonNew Jersey 6.9
- 414HermitagePennsylvania 6.9
- 414State CollegePennsylvania 6.9
- 414HighlandUtah 6.9
- 424HagerstownMaryland 6.8
- 424SewellNew Jersey 6.8
- 424MaryvilleTennessee 6.8
- 424ClintonIowa 6.8
- 424BridgeviewIllinois 6.8
- 424East ChicagoIndiana 6.8
- 424PortageIndiana 6.8
- 424LowellMassachusetts 6.8
- 424AugustaMaine 6.8
- 424SouthfieldMichigan 6.8
- 424RochesterNew York 6.8
- 435Bonita SpringsFlorida 6.7
- 435GreenvilleNorth Carolina 6.7
- 435Short PumpVirginia 6.7
- 435Iowa CityIowa 6.7
- 435MolineIllinois 6.7
- 435LynnMassachusetts 6.7
- 435PainesvilleOhio 6.7
- 435AltoonaPennsylvania 6.7
- 435RutlandVermont 6.7
- 435TucsonArizona 6.7
- 435Santa Monicalow-cost sensorsCalifornia 6.7
- 435BeavertonOregon 6.7
- 435Coos BayOregon 6.7
- 435PortlandOregon 6.7
- 435Kirklandlow-cost sensorsWashington 6.7
- 450Daytona BeachFlorida 6.6
- 450Kendale LakesFlorida 6.6
- 450University CityMissouri 6.6
- 450East HamptonVirginia 6.6
- 450HopewellVirginia 6.6
- 450SalemVirginia 6.6
- 450Cleveland HeightsOhio 6.6
- 450DavenportIowa 6.6
- 450HammondIndiana 6.6
- 450LansingMichigan 6.6
- 450YpsilantiMichigan 6.6
- 450McKeesportPennsylvania 6.6
- 450San Luis ObispoCalifornia 6.6
- 450Spanish SpringsNevada 6.6
- 464Fruit CoveFlorida 6.5
- 464Saint JosephMissouri 6.5
- 464RoanokeVirginia 6.5
- 464New HavenConnecticut 6.5
- 464New LondonConnecticut 6.5
- 464RockfordIllinois 6.5
- 464BlaineMinnesota 6.5
- 464DuluthMinnesota 6.5
- 464Saint PaulMinnesota 6.5
- 464AppletonWisconsin 6.5
- 464Green BayWisconsin 6.5
- 464MadisonWisconsin 6.5
- 464WaukeshaWisconsin 6.5
- 464LongmontColorado 6.5
- 464AshlandOregon 6.5
- 464GreshamOregon 6.5
- 464BellinghamWashington 6.5
- 464BurienWashington 6.5
- 464Oxon Hill-GlassmanorMaryland 6.5
- 483MiamiFlorida 6.4
- 483RockvilleMaryland 6.4
- 483ScaggsvilleMaryland 6.4
- 483ConwaySouth Carolina 6.4
- 483DentonTexas 6.4
- 483South BendIndiana 6.4
- 483North ChicopeeMassachusetts 6.4
- 483BangorMaine 6.4
- 483BurnsvilleMinnesota 6.4
- 483RochesterMinnesota 6.4
- 483ShakopeeMinnesota 6.4
- 483LimaOhio 6.4
- 483Upper Saint ClairPennsylvania 6.4
- 483Oconomowoclow-cost sensorsWisconsin 6.4
- 483Prunedalelow-cost sensorsCalifornia 6.4
- 483RedmondOregon 6.4
- 499ArnoldMissouri 6.3
- 499PflugervilleTexas 6.3
- 499Cedar RapidsIowa 6.3
- 499Fort DodgeIowa 6.3
- 499WorcesterMassachusetts 6.3
- 499JenisonMichigan 6.3
- 499LaconiaNew Hampshire 6.3
- 499TrentonNew Jersey 6.3
- 499BuffaloNew York 6.3
- 499Live Oaklow-cost sensorsCalifornia 6.3
- 499Brightonlow-cost sensorsColorado 6.3
- 499Carson CityNevada 6.3
- 499Spring ValleyNevada 6.3
- 499Union Hill-Novelty Hilllow-cost sensorsWashington 6.3
- 513GainesvilleFlorida 6.2
- 513Lake MaryFlorida 6.2
- 513SarasotaFlorida 6.2
- 513DecaturIllinois 6.2
- 513LeawoodKansas 6.2
- 513BrocktonMassachusetts 6.2
- 513Saint MichaelMinnesota 6.2
- 513ElizabethNew Jersey 6.2
- 513EriePennsylvania 6.2
- 513TempeArizona 6.2
- 513Mission ViejoCalifornia 6.2
- 513OdessaTexas 6.2
- 513MissoulaMontana 6.2
- 513Rapid CitySouth Dakota 6.2
- 527Fort MyersFlorida 6.1
- 527KingsportTennessee 6.1
- 527BloomingtonIllinois 6.1
- 527JolietIllinois 6.1
- 527Oak LawnIllinois 6.1
- 527Michigan CityIndiana 6.1
- 527Fall RiverMassachusetts 6.1
- 527Apple ValleyMinnesota 6.1
- 527New BrunswickNew Jersey 6.1
- 527WeirtonWest Virginia 6.1
- 527Weirton HeightsWest Virginia 6.1
- 527CanbyOregon 6.1
- 527CorvallisOregon 6.1
- 527BremertonWashington 6.1
- 541Fort LauderdaleFlorida 6.0
- 541WatertownSouth Dakota 6.0
- 541MesaArizona 6.0
- 541Spanish ForkUtah 6.0
- 545Roanoke RapidsNorth Carolina 5.9
- 545CookevilleTennessee 5.9
- 545San MarcosTexas 5.9
- 545ChampaignIllinois 5.9
- 545Agouralow-cost sensorsCalifornia 5.9
- 545Santa BarbaraCalifornia 5.9
- 545Windsorlow-cost sensorsCalifornia 5.9
- 545BillingsMontana 5.9
- 545TooeleUtah 5.9
- 545Four CornersFlorida 5.9
- 555McDonoughGeorgia 5.8
- 555SpringfieldIllinois 5.8
- 555FishersIndiana 5.8
- 555RaymoreMissouri 5.8
- 555DyersburgTennessee 5.8
- 555AuroraIllinois 5.8
- 555ZionIllinois 5.8
- 555QuincyMassachusetts 5.8
- 555Saint CloudMinnesota 5.8
- 555YumaArizona 5.8
- 555Salmon CreekWashington 5.8
- 566East LakeFlorida 5.7
- 566Cedar ParkTexas 5.7
- 566CaryIllinois 5.7
- 566NapervilleIllinois 5.7
- 566MilfordMassachusetts 5.7
- 566DerryNew Hampshire 5.7
- 572Deerfield BeachFlorida 5.6
- 572Palm CityFlorida 5.6
- 572SyracuseNew York 5.6
- 575Kansas CityMissouri 5.5
- 575LibertyMissouri 5.5
- 575NorthbrookIllinois 5.5
- 575PittsfieldMassachusetts 5.5
- 575PortsmouthNew Hampshire 5.5
- 575Lake ElsinoreCalifornia 5.5
- 575OceansideCalifornia 5.5
- 575HonoluluHawaii 5.5
- 583GalvestonTexas 5.4
- 583Des MoinesIowa 5.4
- 583MankatoMinnesota 5.4
- 583CoventryRhode Island 5.4
- 583GlendoraCalifornia 5.4
- 583Pasadenalow-cost sensorsCalifornia 5.4
- 583Fort CollinsColorado 5.4
- 583Idaho FallsIdaho 5.4
- 591Delray BeachFlorida 5.3
- 591OrcuttCalifornia 5.3
- 591ThorntonColorado 5.3
- 591HendersonNevada 5.3
- 595Pompano BeachFlorida 5.2
- 595WellingtonFlorida 5.2
- 595PleasantvilleNew Jersey 5.2
- 595Casas AdobesArizona 5.2
- 595TruckeeCalifornia 5.2
- 595SheridanWyoming 5.2
- 595KahuluiHawaii 5.2
- 602Newtonlow-cost sensorsMassachusetts 5.1
- 602BrawleyCalifornia 5.1
- 602IndioCalifornia 5.1
- 602ParadiseCalifornia 5.1
- 602SalinasCalifornia 5.1
- 602Arvadalow-cost sensorsColorado 5.1
- 602AberdeenWashington 5.1
- 609Palm BayFlorida 5.0
- 609La VistaNebraska 5.0
- 609MaranaArizona 5.0
- 609Santa ClaritaCalifornia 5.0
- 613Belle GladeFlorida 4.9
- 613Atlantic CityNew Jersey 4.9
- 613West FargoNorth Dakota 4.9
- 613La Crescenta-Montroselow-cost sensorsCalifornia 4.9
- 617Arroyo GrandeCalifornia 4.8
- 617PowayCalifornia 4.8
- 617MoscowIdaho 4.8
- 620DavieFlorida 4.7
- 620Seasidelow-cost sensorsCalifornia 4.7
- 620Lakewoodlow-cost sensorsColorado 4.7
- 620Dodge CityKansas 4.7
- 620Cedar CityUtah 4.7
- 625WestonFlorida 4.6
- 625El CentroCalifornia 4.6
- 625OxnardCalifornia 4.6
- 625Simi ValleyCalifornia 4.6
- 625DenverColorado 4.6
- 625Forest GroveOregon 4.6
- 625Oak HarborWashington 4.6
- 632Coconut CreekFlorida 4.5
- 632AnkenyIowa 4.5
- 632AberdeenSouth Dakota 4.5
- 632NipomoCalifornia 4.5
- 636BellevueNebraska 4.4
- 636EnterpriseNevada 4.4
- 638OmahaNebraska 4.3
- 638HobbsNew Mexico 4.3
- 638LubbockTexas 4.3
- 638Redmondlow-cost sensorsWashington 4.3
- 638Summerlin SouthNevada 4.3
- 643Colorado SpringsColorado 4.2
- 643PuebloColorado 4.2
- 643Apache JunctionArizona 4.2
- 643BismarckNorth Dakota 4.2
- 647PullmanWashington 4.1
- 648WindsorColorado 4.0
- 648HiloHawaii 4.0
- 650TemeculaCalifornia 3.9
- 650BellevueWashington 3.9
- 652LafayetteLouisiana 3.8
- 652Bothelllow-cost sensorsWashington 3.8
- 654Middletonlow-cost sensorsWisconsin 3.7
- 654Thousand OaksCalifornia 3.7
- 656Sioux FallsSouth Dakota 3.6
- 656HollisterCalifornia 3.6
- 658LittletonColorado 3.5
- 659HurricaneUtah 3.4
- 660MarquetteMichigan 3.3
- 660Grand IslandNebraska 3.3
- 660BanningCalifornia 3.3
- 660Las CrucesNew Mexico 3.3
- 660BoulderColorado 3.3
- 665LancasterCalifornia 3.1
- 665Ken CarylColorado 3.1
- 667Cañon CityColorado 3.0
- 668Rock SpringsWyoming 2.8
- 669MesquiteNevada 2.7
- 670RidgecrestCalifornia 2.6
- 671Green ValleyArizona 2.5
- 671Goletalow-cost sensorsCalifornia 2.5
- 671Boulder CityNevada 2.5
- 674Mount VernonWashington 2.4
- 675CheyenneWyoming 2.1
- 675LaramieWyoming 2.1
- 677FillmoreCalifornia 2.0
- 678LompocCalifornia 1.8
- 679CasperWyoming 0.9
- 680Oro Valleylow-cost sensorsArizona 0.7
- 681Parkerlow-cost sensorsColorado 0.2
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+