SmogRank / Countries / United States / June 2026
Most polluted cities in United States, June 2026
663 cities in United States ranked by their average PM2.5 over the 30 days. Worst: Calexico at 24.3 µg/m³, #133 of 1,918 cities in the world. Cleanest: Oro Valley at 0.0. A city needs measurements on 70% of the days to be ranked.
- 1CalexicoCalifornia 24.3
- 2Eagle PassTexas 16.6
- 3Redmondlow-cost sensorsWashington 16.5
- 4BillingsMontana 16.3
- 5Wake Forestlow-cost sensorsNorth Carolina 15.3
- 6LaredoTexas 14.3
- 7Jurupa ValleyCalifornia 14.1
- 8Corpus ChristiTexas 13.9
- 8FontanaCalifornia 13.9
- 10Los AngelesCalifornia 13.5
- 11BaytownTexas 12.8
- 12BrownsvilleTexas 12.6
- 13AustinTexas 12.5
- 13RiversideCalifornia 12.5
- 15MissionTexas 12.4
- 15GlendoraCalifornia 12.4
- 17EdinburgTexas 12.0
- 17FlagstaffArizona 12.0
- 19ShreveportLouisiana 11.9
- 19GalvestonTexas 11.9
- 21LimaOhio 11.8
- 22WhittierCalifornia 11.7
- 23Pasadenalow-cost sensorsCalifornia 11.6
- 24HoustonTexas 11.5
- 24El PasoTexas 11.5
- 24SocorroTexas 11.5
- 27DallasTexas 11.4
- 27Deer ParkTexas 11.4
- 29San AntonioTexas 11.3
- 30SpartanburgSouth Carolina 11.2
- 31Little RockArkansas 11.0
- 31VeniceFlorida 11.0
- 31Live OakTexas 11.0
- 34MaconGeorgia 10.7
- 34WyomingMichigan 10.7
- 36PasadenaTexas 10.6
- 37West MemphisArkansas 10.4
- 37Kendale LakesFlorida 10.4
- 37IndioCalifornia 10.4
- 37Lake ElsinoreCalifornia 10.4
- 41Missouri CityTexas 10.3
- 41Santa ClaritaCalifornia 10.3
- 43New OrleansLouisiana 10.2
- 43Port ArthurTexas 10.2
- 45ComptonCalifornia 10.1
- 45Santa Monicalow-cost sensorsCalifornia 10.1
- 47SpringdaleArkansas 10.0
- 47MillcreekUtah 10.0
- 49MiddletownOhio 9.9
- 49BangorMaine 9.9
- 51FlorenceSouth Carolina 9.8
- 51Mission ViejoCalifornia 9.8
- 51MidwayFlorida 9.8
- 54SulphurLouisiana 9.7
- 54DentonTexas 9.7
- 54La PorteTexas 9.7
- 54San MarcosTexas 9.7
- 54El CentroCalifornia 9.7
- 59BeltonTexas 9.6
- 59Sunland ParkNew Mexico 9.6
- 61TampaFlorida 9.5
- 61Cedar ParkTexas 9.5
- 61TaylorTexas 9.5
- 61BanningCalifornia 9.5
- 61BurbankCalifornia 9.5
- 66ClaytonNorth Carolina 9.4
- 66BartlettTennessee 9.4
- 68ChattanoogaTennessee 9.3
- 68ConroeTexas 9.3
- 68Fort WorthTexas 9.3
- 68DoltonIllinois 9.3
- 72MorrisvilleNorth Carolina 9.2
- 72CorsicanaTexas 9.2
- 72SaginawTexas 9.2
- 72TexarkanaTexas 9.2
- 76TrussvilleAlabama 9.1
- 76OcalaFlorida 9.1
- 76OwensboroKentucky 9.1
- 76CharlotteNorth Carolina 9.1
- 76ChesapeakeVirginia 9.1
- 76PowayCalifornia 9.1
- 76HerrimanUtah 9.1
- 76West JordanUtah 9.1
- 84TallahasseeFlorida 9.0
- 84Granite CityIllinois 9.0
- 84Baton RougeLouisiana 9.0
- 84PhiladelphiaPennsylvania 9.0
- 84Simi ValleyCalifornia 9.0
- 84Spanish ForkUtah 9.0
- 90AtlantaGeorgia 8.9
- 90ChalmetteLouisiana 8.9
- 90GreenvilleNorth Carolina 8.9
- 90LexingtonNorth Carolina 8.9
- 90College StationTexas 8.9
- 90PflugervilleTexas 8.9
- 90CorcoranCalifornia 8.9
- 90OdessaTexas 8.9
- 98ValdostaGeorgia 8.8
- 98JacksonMississippi 8.8
- 98NorwoodOhio 8.8
- 98AnaheimCalifornia 8.8
- 98San DiegoCalifornia 8.8
- 103Bonita SpringsFlorida 8.7
- 103PortsmouthOhio 8.7
- 103MooreOklahoma 8.7
- 103PortlandMaine 8.7
- 103VisaliaCalifornia 8.7
- 108VictorvilleCalifornia 8.6
- 108Candler-McAfeeGeorgia 8.6
- 110Ferry PassFlorida 8.5
- 110Ponte Vedra BeachFlorida 8.5
- 110El CajonCalifornia 8.5
- 113MontgomeryAlabama 8.4
- 113KennerLouisiana 8.4
- 113Camdenlow-cost sensorsNew Jersey 8.4
- 113ElizabethNew Jersey 8.4
- 113OremUtah 8.4
- 118GadsdenAlabama 8.3
- 118Warner RobinsGeorgia 8.3
- 118Upper AltonIllinois 8.3
- 118Roanoke RapidsNorth Carolina 8.3
- 118TulsaOklahoma 8.3
- 118North CharlestonSouth Carolina 8.3
- 118Chula VistaCalifornia 8.3
- 118ClovisCalifornia 8.3
- 118Long BeachCalifornia 8.3
- 118Santa BarbaraCalifornia 8.3
- 128AugustaGeorgia 8.2
- 128Saint AndrewsSouth Carolina 8.2
- 128ClarksvilleTennessee 8.2
- 128SteubenvilleOhio 8.2
- 128West MifflinPennsylvania 8.2
- 128VallejoCalifornia 8.2
- 134AthensGeorgia 8.1
- 134LafayetteLouisiana 8.1
- 134GreensboroNorth Carolina 8.1
- 134YorkPennsylvania 8.1
- 134JacksonTennessee 8.1
- 134EwingNew Jersey 8.1
- 134WestervilleOhio 8.1
- 134FillmoreCalifornia 8.1
- 134OceansideCalifornia 8.1
- 143IndianapolisIndiana 8.0
- 143PennsaukenNew Jersey 8.0
- 143BensalemPennsylvania 8.0
- 143HanfordCalifornia 8.0
- 143SalinasCalifornia 8.0
- 143San JoseCalifornia 8.0
- 143South Lake TahoeCalifornia 8.0
- 143TooeleUtah 8.0
- 143West Valley CityUtah 8.0
- 152BirminghamAlabama 7.9
- 152PrichardAlabama 7.9
- 152WashingtonDistrict of Columbia 7.9
- 152AlbanyGeorgia 7.9
- 152GulfportMississippi 7.9
- 152HickoryNorth Carolina 7.9
- 152KnoxvilleTennessee 7.9
- 159EvansvilleIndiana 7.8
- 159JasperIndiana 7.8
- 159AshlandKentucky 7.8
- 159LouisvilleKentucky 7.8
- 159MonroeLouisiana 7.8
- 159Saint JosephMissouri 7.8
- 159Winston-SalemNorth Carolina 7.8
- 159Oak LawnIllinois 7.8
- 159Lexingtonlow-cost sensorsMassachusetts 7.8
- 159FlintMichigan 7.8
- 159PortsmouthNew Hampshire 7.8
- 159ClevelandOhio 7.8
- 159BakersfieldCalifornia 7.8
- 172DecaturAlabama 7.7
- 172WichitaKansas 7.7
- 172ClemmonsNorth Carolina 7.7
- 172RaleighNorth Carolina 7.7
- 172BridgeviewIllinois 7.7
- 172PeoriaIllinois 7.7
- 172OregonOhio 7.7
- 172PerrysburgOhio 7.7
- 172BerkeleyCalifornia 7.7
- 172San LeandroCalifornia 7.7
- 172Salt Lake CityUtah 7.7
- 183ColumbusGeorgia 7.6
- 183AshevilleNorth Carolina 7.6
- 183CincinnatiOhio 7.6
- 183EdmondOklahoma 7.6
- 183HopewellVirginia 7.6
- 183Jersey CityNew Jersey 7.6
- 183LancasterPennsylvania 7.6
- 183BountifulUtah 7.6
- 191MiamiFlorida 7.5
- 191PleasantvilleNew Jersey 7.5
- 191HendersonvilleTennessee 7.5
- 191MaryvilleTennessee 7.5
- 191NashvilleTennessee 7.5
- 191CantonOhio 7.5
- 191SuperiorWisconsin 7.5
- 198HuntsvilleAlabama 7.4
- 198JeffersonvilleIndiana 7.4
- 198St. LouisMissouri 7.4
- 198DaytonOhio 7.4
- 198SpringfieldOhio 7.4
- 198BristolVirginia 7.4
- 198CharlestonWest Virginia 7.4
- 198TrentonNew Jersey 7.4
- 198New York CityNew York 7.4
- 198MaderaCalifornia 7.4
- 198San Luis ObispoCalifornia 7.4
- 209FairhopeAlabama 7.3
- 209Palm CityFlorida 7.3
- 209Pompano BeachFlorida 7.3
- 209DecaturIllinois 7.3
- 209East Saint LouisIllinois 7.3
- 209PascagoulaMississippi 7.3
- 209ElkhartIndiana 7.3
- 209Fort WayneIndiana 7.3
- 209Royal Oaklow-cost sensorsMichigan 7.3
- 209PatersonNew Jersey 7.3
- 209Arroyo GrandeCalifornia 7.3
- 209Cedar CityUtah 7.3
- 221Fort MyersFlorida 7.2
- 221SarasotaFlorida 7.2
- 221HattiesburgMississippi 7.2
- 221HernandoMississippi 7.2
- 221Ponca CityOklahoma 7.2
- 221GreenvilleSouth Carolina 7.2
- 221East HamptonVirginia 7.2
- 221Des MoinesIowa 7.2
- 221BrocktonMassachusetts 7.2
- 221PortervilleCalifornia 7.2
- 221TemeculaCalifornia 7.2
- 221LongmontColorado 7.2
- 233Hunt ValleyMaryland 7.1
- 233South LaurelMaryland 7.1
- 233Atlantic CityNew Jersey 7.1
- 233JenksOklahoma 7.1
- 233Franklin ParkIllinois 7.1
- 233WarrenOhio 7.1
- 233LebanonPennsylvania 7.1
- 233FresnoCalifornia 7.1
- 233LivermoreCalifornia 7.1
- 233NipomoCalifornia 7.1
- 233HobbsNew Mexico 7.1
- 233Las CrucesNew Mexico 7.1
- 245BessemerAlabama 7.0
- 245Delray BeachFlorida 7.0
- 245Toms RiverNew Jersey 7.0
- 245LawtonOklahoma 7.0
- 245Short PumpVirginia 7.0
- 245BuffaloNew York 7.0
- 245ToledoOhio 7.0
- 245HarrisburgPennsylvania 7.0
- 245PittsburghPennsylvania 7.0
- 245Torrancelow-cost sensorsCalifornia 7.0
- 255BloomingtonIndiana 6.9
- 255RichmondVirginia 6.9
- 255ElginIllinois 6.9
- 255MercedCalifornia 6.9
- 255OaklandCalifornia 6.9
- 255ThorntonColorado 6.9
- 255HighlandUtah 6.9
- 262DoverDelaware 6.8
- 262NewarkDelaware 6.8
- 262GainesvilleGeorgia 6.8
- 262TopekaKansas 6.8
- 262Saint MatthewsKentucky 6.8
- 262Valley StationKentucky 6.8
- 262ColumbusOhio 6.8
- 262BrookfieldIllinois 6.8
- 262WilkinsburgPennsylvania 6.8
- 262Oconomowoclow-cost sensorsWisconsin 6.8
- 262WeirtonWest Virginia 6.8
- 262BridgeportConnecticut 6.8
- 274PaducahKentucky 6.7
- 274Deerfield BeachFlorida 6.7
- 274Oak RidgeFlorida 6.7
- 274SavannahGeorgia 6.7
- 274SpringfieldIllinois 6.7
- 274Kansas CityKansas 6.7
- 274LemayMissouri 6.7
- 274Oklahoma CityOklahoma 6.7
- 274ColumbiaTennessee 6.7
- 274New HavenConnecticut 6.7
- 274WaterburyConnecticut 6.7
- 274Elmwood ParkIllinois 6.7
- 274LewistonMaine 6.7
- 274Bay CityMichigan 6.7
- 274DearbornMichigan 6.7
- 274DetroitMichigan 6.7
- 274New BrunswickNew Jersey 6.7
- 274NorristownPennsylvania 6.7
- 274MilwaukeeWisconsin 6.7
- 274RichmondCalifornia 6.7
- 274WoodlandCalifornia 6.7
- 274Arvadalow-cost sensorsColorado 6.7
- 296Coconut CreekFlorida 6.6
- 296St. PetersburgFlorida 6.6
- 296ValricoFlorida 6.6
- 296JeffersontownKentucky 6.6
- 296ChesterPennsylvania 6.6
- 296KingsportTennessee 6.6
- 296Calumet CityIllinois 6.6
- 296LafayetteIndiana 6.6
- 296Michigan CityIndiana 6.6
- 296MuncieIndiana 6.6
- 296KalamazooMichigan 6.6
- 296Lincoln ParkMichigan 6.6
- 296Fort LeeNew Jersey 6.6
- 296ScrantonPennsylvania 6.6
- 296NogalesArizona 6.6
- 296Santa CruzCalifornia 6.6
- 296Fort CollinsColorado 6.6
- 313DavieFlorida 6.5
- 313Fruit CoveFlorida 6.5
- 313WellingtonFlorida 6.5
- 313New AlbanyIndiana 6.5
- 313BaltimoreMaryland 6.5
- 313ScaggsvilleMaryland 6.5
- 313SewellNew Jersey 6.5
- 313LebanonOhio 6.5
- 313White OakOhio 6.5
- 313HartfordConnecticut 6.5
- 313AnkenyIowa 6.5
- 313NorthbrookIllinois 6.5
- 313SpringfieldMassachusetts 6.5
- 313AugustaMaine 6.5
- 313LincolnNebraska 6.5
- 313LindenNew Jersey 6.5
- 313ReadingPennsylvania 6.5
- 313San FranciscoCalifornia 6.5
- 331WilmingtonDelaware 6.4
- 331Daytona BeachFlorida 6.4
- 331West PensacolaFlorida 6.4
- 331LawrencevilleGeorgia 6.4
- 331MasonOhio 6.4
- 331HarrisonburgVirginia 6.4
- 331RoanokeVirginia 6.4
- 331SpringfieldVirginia 6.4
- 331DanburyConnecticut 6.4
- 331ChampaignIllinois 6.4
- 331ChicagoIllinois 6.4
- 331South BendIndiana 6.4
- 331YoungstownOhio 6.4
- 331RutlandVermont 6.4
- 331Cañon CityColorado 6.4
- 331BoulderColorado 6.4
- 331Four CornersFlorida 6.4
- 348OrlandoFlorida 6.3
- 348DerbyKansas 6.3
- 348OlatheKansas 6.3
- 348SpringfieldMissouri 6.3
- 348CookevilleTennessee 6.3
- 348CharlottesvilleVirginia 6.3
- 348SalemVirginia 6.3
- 348ClintonIowa 6.3
- 348WaterlooIowa 6.3
- 348PortageIndiana 6.3
- 348BostonMassachusetts 6.3
- 348RedfordMichigan 6.3
- 348AlbanyNew York 6.3
- 348AkronOhio 6.3
- 348MedinaOhio 6.3
- 348AllentownPennsylvania 6.3
- 348YumaArizona 6.3
- 348AtascaderoCalifornia 6.3
- 348TurlockCalifornia 6.3
- 348DenverColorado 6.3
- 348AmarilloTexas 6.3
- 348North OgdenUtah 6.3
- 370HueytownAlabama 6.2
- 370GainesvilleFlorida 6.2
- 370ElizabethtownKentucky 6.2
- 370University CityMissouri 6.2
- 370Fort DodgeIowa 6.2
- 370AndersonIndiana 6.2
- 370HammondIndiana 6.2
- 370Grand RapidsMichigan 6.2
- 370DavisCalifornia 6.2
- 370OxnardCalifornia 6.2
- 370LubbockTexas 6.2
- 370HurricaneUtah 6.2
- 382Palm BayFlorida 6.1
- 382Safety HarborFlorida 6.1
- 382Winter ParkFlorida 6.1
- 382DyersburgTennessee 6.1
- 382Cleveland HeightsOhio 6.1
- 382LowellMassachusetts 6.1
- 382LansingMichigan 6.1
- 382OmahaNebraska 6.1
- 382HolbrookNew York 6.1
- 382Huntington Beachlow-cost sensorsCalifornia 6.1
- 382PuebloColorado 6.1
- 382GreeleyColorado 6.1
- 382Great FallsMontana 6.1
- 395JacksonvilleFlorida 6.0
- 395Kansas CityMissouri 6.0
- 395New LondonConnecticut 6.0
- 395NapervilleIllinois 6.0
- 395JenisonMichigan 6.0
- 395McKeesportPennsylvania 6.0
- 395PhoenixArizona 6.0
- 395GilroyCalifornia 6.0
- 395Redwood CityCalifornia 6.0
- 395RidgecrestCalifornia 6.0
- 395Colorado SpringsColorado 6.0
- 395Grand JunctionColorado 6.0
- 395Brigham CityUtah 6.0
- 395MagnaUtah 6.0
- 409BearDelaware 5.9
- 409Lexington-FayetteKentucky 5.9
- 409NicholasvilleKentucky 5.9
- 409Rose HillVirginia 5.9
- 409RockfordIllinois 5.9
- 409LynnMassachusetts 5.9
- 409North ChicopeeMassachusetts 5.9
- 409YpsilantiMichigan 5.9
- 409BethlehemPennsylvania 5.9
- 409WaukeshaWisconsin 5.9
- 409TacomaWashington 5.9
- 420Fort ThomasKentucky 5.8
- 420DurhamNorth Carolina 5.8
- 420GaryIndiana 5.8
- 420CarlislePennsylvania 5.8
- 420Upper Saint ClairPennsylvania 5.8
- 420South MilwaukeeWisconsin 5.8
- 426Fort SmithArkansas 5.7
- 426Lake MaryFlorida 5.7
- 426BrunswickGeorgia 5.7
- 426AshburnVirginia 5.7
- 426AuroraIllinois 5.7
- 426CaryIllinois 5.7
- 426JolietIllinois 5.7
- 426East ChicagoIndiana 5.7
- 426Fall RiverMassachusetts 5.7
- 426WorcesterMassachusetts 5.7
- 426Port HuronMichigan 5.7
- 426RochesterMinnesota 5.7
- 426DerryNew Hampshire 5.7
- 426HermitagePennsylvania 5.7
- 426GaltCalifornia 5.7
- 426MantecaCalifornia 5.7
- 426BadgerAlaska 5.7
- 443East LakeFlorida 5.6
- 443HaverhillMassachusetts 5.6
- 443TaylorMichigan 5.6
- 443RochesterNew York 5.6
- 443DublinOhio 5.6
- 443WatertownSouth Dakota 5.6
- 443TempeArizona 5.6
- 443Rio RanchoNew Mexico 5.6
- 443WindsorColorado 5.6
- 443Rapid CitySouth Dakota 5.6
- 443Oxon Hill-GlassmanorMaryland 5.6
- 454EdgewoodMaryland 5.5
- 454RockvilleMaryland 5.5
- 454PittsfieldMassachusetts 5.5
- 454EastpointeMichigan 5.5
- 454SouthfieldMichigan 5.5
- 454MankatoMinnesota 5.5
- 454MinneapolisMinnesota 5.5
- 454PainesvilleOhio 5.5
- 454Shaker HeightsOhio 5.5
- 454Eau ClaireWisconsin 5.5
- 454LancasterCalifornia 5.5
- 454Ken CarylColorado 5.5
- 454AlbuquerqueNew Mexico 5.5
- 454Columbia CityWashington 5.5
- 468ElktonMaryland 5.4
- 468DavenportIowa 5.4
- 468MilfordMassachusetts 5.4
- 468Saint PaulMinnesota 5.4
- 468JohnstownPennsylvania 5.4
- 468Casa GrandeArizona 5.4
- 468StocktonCalifornia 5.4
- 475McDonoughGeorgia 5.3
- 475McAlesterOklahoma 5.3
- 475MuscatineIowa 5.3
- 475Des PlainesIllinois 5.3
- 475ZionIllinois 5.3
- 475QuincyMassachusetts 5.3
- 475KeeneNew Hampshire 5.3
- 475BayonneNew Jersey 5.3
- 475SyracuseNew York 5.3
- 475State CollegePennsylvania 5.3
- 475AppletonWisconsin 5.3
- 475Green BayWisconsin 5.3
- 475Weirton HeightsWest Virginia 5.3
- 475HollisterCalifornia 5.3
- 475MartinezCalifornia 5.3
- 475RosevilleCalifornia 5.3
- 475Thousand OaksCalifornia 5.3
- 492HagerstownMaryland 5.2
- 492LibertyMissouri 5.2
- 492Cedar RapidsIowa 5.2
- 492Iowa CityIowa 5.2
- 492BloomingtonIllinois 5.2
- 492FraminghamMassachusetts 5.2
- 492GreenfieldMassachusetts 5.2
- 492BurnsvilleMinnesota 5.2
- 492EriePennsylvania 5.2
- 492TucsonArizona 5.2
- 492ConcordCalifornia 5.2
- 492OrcuttCalifornia 5.2
- 492San RafaelCalifornia 5.2
- 492TruckeeCalifornia 5.2
- 492RentonWashington 5.2
- 507South VinelandNew Jersey 5.1
- 507MolineIllinois 5.1
- 507AltoonaPennsylvania 5.1
- 510Columbialow-cost sensorsMissouri 5.0
- 510RaymoreMissouri 5.0
- 510MarquetteMichigan 5.0
- 510BlaineMinnesota 5.0
- 510ParadiseCalifornia 5.0
- 510TracyCalifornia 5.0
- 510Las VegasNevada 5.0
- 510SeattleWashington 5.0
- 518ArnoldMissouri 4.9
- 518ShakopeeMinnesota 4.9
- 518ProvidenceRhode Island 4.9
- 518Casas AdobesArizona 4.9
- 518ModestoCalifornia 4.9
- 518BellinghamWashington 4.9
- 524Apple ValleyMinnesota 4.8
- 524MadisonWisconsin 4.8
- 524GlendaleArizona 4.8
- 524EnterpriseNevada 4.8
- 524NampaIdaho 4.8
- 529Saint MichaelMinnesota 4.7
- 529MesaArizona 4.7
- 529LewistonIdaho 4.7
- 532DuluthMinnesota 4.6
- 532Saint CloudMinnesota 4.6
- 532West FargoNorth Dakota 4.6
- 532SacramentoCalifornia 4.6
- 532The DallesOregon 4.6
- 532KentWashington 4.6
- 538LincolnCalifornia 4.5
- 538HendersonNevada 4.5
- 538RenoNevada 4.5
- 538Spring ValleyNevada 4.5
- 542LeawoodKansas 4.4
- 542HollandMichigan 4.4
- 542Carson CityNevada 4.4
- 545UticaNew York 4.3
- 545MesquiteNevada 4.3
- 545PocatelloIdaho 4.3
- 545SunnysideWashington 4.3
- 545Arden-ArcadeCalifornia 4.3
- 545Summerlin SouthNevada 4.3
- 545Tri-CitiesWashington 4.3
- 552Santa RosaCalifornia 4.2
- 552ReddingCalifornia 4.2
- 552Coos BayOregon 4.2
- 552TigardOregon 4.2
- 552AuburnWashington 4.2
- 552Rock SpringsWyoming 4.2
- 558La VistaNebraska 4.1
- 558BrookingsSouth Dakota 4.1
- 558Spanish SpringsNevada 4.1
- 558Coeur d'AleneIdaho 4.1
- 558BremertonWashington 4.1
- 558SpokaneWashington 4.1
- 558VancouverWashington 4.1
- 565Grand IslandNebraska 4.0
- 565PaysonArizona 4.0
- 565Delanolow-cost sensorsCalifornia 4.0
- 565Goletalow-cost sensorsCalifornia 4.0
- 565LompocCalifornia 4.0
- 565UkiahCalifornia 4.0
- 565BoiseIdaho 4.0
- 565Twin FallsIdaho 4.0
- 565GreshamOregon 4.0
- 574BellevueNebraska 3.9
- 574VacavilleCalifornia 3.9
- 574Boulder CityNevada 3.9
- 577ConwaySouth Carolina 3.8
- 577Brookfieldlow-cost sensorsWisconsin 3.8
- 577FolsomCalifornia 3.8
- 577Los Banoslow-cost sensorsCalifornia 3.8
- 577BozemanMontana 3.8
- 582Evanstonlow-cost sensorsIllinois 3.7
- 582MaranaArizona 3.7
- 582LaramieWyoming 3.7
- 585EllensburgWashington 3.6
- 585ShorelineWashington 3.6
- 585YakimaWashington 3.6
- 588Sioux FallsSouth Dakota 3.5
- 588CanbyOregon 3.5
- 588Salmon CreekWashington 3.5
- 588KīheiHawaii 3.5
- 588HonoluluHawaii 3.5
- 593PawtucketRhode Island 3.4
- 593Apache JunctionArizona 3.4
- 593Idaho FallsIdaho 3.4
- 593ButteMontana 3.4
- 593BismarckNorth Dakota 3.4
- 593HermistonOregon 3.4
- 593WenatcheeWashington 3.4
- 600White PlainsNew York 3.3
- 600GahannaOhio 3.3
- 600AshlandOregon 3.3
- 600EugeneOregon 3.3
- 604Green ValleyArizona 3.2
- 604AlbanyOregon 3.2
- 604HillsboroOregon 3.2
- 604MedfordOregon 3.2
- 604SalemOregon 3.2
- 604AberdeenWashington 3.2
- 604CentraliaWashington 3.2
- 604ParklandWashington 3.2
- 604CheyenneWyoming 3.2
- 613New CityNew York 3.1
- 613NewburghNew York 3.1
- 613Encinitaslow-cost sensorsCalifornia 3.1
- 613Oregon CityOregon 3.1
- 613PortlandOregon 3.1
- 613BellevueWashington 3.1
- 613LongviewWashington 3.1
- 613Picnic Point-North LynnwoodWashington 3.1
- 621LaconiaNew Hampshire 3.0
- 621CoventryRhode Island 3.0
- 621HelenaMontana 3.0
- 621AltamontOregon 3.0
- 621BeavertonOregon 3.0
- 621PendletonOregon 3.0
- 621LaceyWashington 3.0
- 621Walla WallaWashington 3.0
- 629ChicoCalifornia 2.9
- 629PullmanWashington 2.9
- 629KahuluiHawaii 2.9
- 629HiloHawaii 2.9
- 633Palo Altolow-cost sensorsCalifornia 2.8
- 633MilwaukieOregon 2.8
- 633RoseburgOregon 2.8
- 633CasperWyoming 2.8
- 637BendOregon 2.7
- 637BurienWashington 2.7
- 637Spokane ValleyWashington 2.7
- 637FairbanksAlaska 2.7
- 641WoodburnOregon 2.6
- 641AnacortesWashington 2.6
- 643CorvallisOregon 2.5
- 643Grants PassOregon 2.5
- 645Forest GroveOregon 2.4
- 645McMinnvilleOregon 2.4
- 645RedmondOregon 2.4
- 645AnchorageAlaska 2.4
- 649Parkerlow-cost sensorsColorado 2.3
- 649GilletteWyoming 2.3
- 651MissoulaMontana 2.2
- 651DallasOregon 2.2
- 653Tularelow-cost sensorsCalifornia 2.0
- 653MoscowIdaho 2.0
- 653Mount VernonWashington 2.0
- 656Middletonlow-cost sensorsWisconsin 1.8
- 657AberdeenSouth Dakota 1.5
- 657Loganlow-cost sensorsUtah 1.5
- 659Bothelllow-cost sensorsWashington 1.3
- 660Monroelow-cost sensorsWashington 1.2
- 661Kirklandlow-cost sensorsWashington 0.8
- 661Union Hill-Novelty Hilllow-cost sensorsWashington 0.8
- 663Oro Valleylow-cost sensorsArizona 0.0
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+