SmogRank / Countries / United States / October 2023
Most polluted cities in United States, October 2023
590 cities in United States ranked by their average PM2.5 over the 31 days. Worst: Birmingham at 15.5 µg/m³, #58 of 1,686 cities in the world. Cleanest: Anacortes at 1.2. A city needs measurements on 70% of the days to be ranked.
- 1BirminghamAlabama 15.5
- 2HernandoMississippi 14.1
- 3HanfordCalifornia 13.8
- 4FresnoCalifornia 13.6
- 5AnaheimCalifornia 13.3
- 6ComptonCalifornia 12.9
- 7BakersfieldCalifornia 12.6
- 7CalexicoCalifornia 12.6
- 9FontanaCalifornia 12.1
- 10TurlockCalifornia 11.8
- 10VisaliaCalifornia 11.8
- 12CorcoranCalifornia 11.6
- 12Los AngelesCalifornia 11.6
- 14Little RockArkansas 11.5
- 14BartlettTennessee 11.5
- 14BensalemPennsylvania 11.5
- 14MaderaCalifornia 11.5
- 18Jurupa ValleyCalifornia 11.4
- 19Baton RougeLouisiana 11.3
- 20HattiesburgMississippi 11.1
- 21Granite CityIllinois 10.9
- 21JacksonMississippi 10.9
- 23ModestoCalifornia 10.8
- 24Carsonlow-cost sensorsCalifornia 10.7
- 25East Saint LouisIllinois 10.6
- 25YumaArizona 10.6
- 25Hawthornelow-cost sensorsCalifornia 10.6
- 28RiversideCalifornia 10.5
- 29OcalaFlorida 10.2
- 30West MemphisArkansas 10.1
- 30ShreveportLouisiana 10.1
- 32Chula VistaCalifornia 10.0
- 32Torrancelow-cost sensorsCalifornia 10.0
- 34PascagoulaMississippi 9.9
- 35HueytownAlabama 9.7
- 35GulfportMississippi 9.7
- 35ClovisCalifornia 9.7
- 35Inglewoodlow-cost sensorsCalifornia 9.7
- 39StocktonCalifornia 9.6
- 39EugeneOregon 9.6
- 41Casa GrandeArizona 9.5
- 41MercedCalifornia 9.5
- 41PortervilleCalifornia 9.5
- 44Ponte Vedra BeachFlorida 9.4
- 44HoustonTexas 9.4
- 44San DiegoCalifornia 9.4
- 47East RidgeTennessee 9.3
- 47Yuba CityCalifornia 9.3
- 49AlbanyGeorgia 9.2
- 49ValdostaGeorgia 9.2
- 49Calumet CityIllinois 9.2
- 49East ChicagoIndiana 9.2
- 49BurbankCalifornia 9.2
- 49RedmondOregon 9.2
- 49Candler-McAfeeGeorgia 9.2
- 56BaytownTexas 9.1
- 56Port ArthurTexas 9.1
- 56ElizabethNew Jersey 9.1
- 56RoseburgOregon 9.1
- 56SalemOregon 9.1
- 61TallahasseeFlorida 9.0
- 61MaconGeorgia 9.0
- 61Redwood CityCalifornia 9.0
- 61Santa Monicalow-cost sensorsCalifornia 9.0
- 65Bonita SpringsFlorida 8.9
- 65Ferry PassFlorida 8.9
- 65IndianapolisIndiana 8.9
- 65TexarkanaTexas 8.9
- 65ProvidenceRhode Island 8.9
- 65Lomitalow-cost sensorsCalifornia 8.9
- 65OceansideCalifornia 8.9
- 65LewistonIdaho 8.9
- 65Columbia CityWashington 8.9
- 74TrussvilleAlabama 8.8
- 74East LakeFlorida 8.8
- 74LafayetteLouisiana 8.8
- 74GlendaleArizona 8.8
- 74Long BeachCalifornia 8.8
- 74RichmondCalifornia 8.8
- 80Coconut CreekFlorida 8.7
- 80TampaFlorida 8.7
- 80VeniceFlorida 8.7
- 80DublinOhio 8.7
- 80ParklandWashington 8.7
- 80MidwayFlorida 8.7
- 86SulphurLouisiana 8.6
- 86GreensboroNorth Carolina 8.6
- 86ConroeTexas 8.6
- 86ClintonIowa 8.6
- 86JolietIllinois 8.6
- 86Oak LawnIllinois 8.6
- 86RockfordIllinois 8.6
- 86DearbornMichigan 8.6
- 86DetroitMichigan 8.6
- 86IndioCalifornia 8.6
- 86Great FallsMontana 8.6
- 86TigardOregon 8.6
- 98AugustaGeorgia 8.5
- 98SavannahGeorgia 8.5
- 98DecaturIllinois 8.5
- 98St. LouisMissouri 8.5
- 98ChattanoogaTennessee 8.5
- 98DavenportIowa 8.5
- 98TempeArizona 8.5
- 98El PasoTexas 8.5
- 98AlbanyOregon 8.5
- 98RentonWashington 8.5
- 98Spokane ValleyWashington 8.5
- 98YakimaWashington 8.5
- 110Daytona BeachFlorida 8.4
- 110AtlantaGeorgia 8.4
- 110LouisvilleKentucky 8.4
- 110ColumbusOhio 8.4
- 110NapervilleIllinois 8.4
- 110NorthbrookIllinois 8.4
- 110PhoenixArizona 8.4
- 117Phenix CityAlabama 8.3
- 117Valley StationKentucky 8.3
- 117Ponca CityOklahoma 8.3
- 117Iowa CityIowa 8.3
- 117BloomingtonIllinois 8.3
- 117BrawleyCalifornia 8.3
- 123GainesvilleGeorgia 8.2
- 123JacksonTennessee 8.2
- 123Missouri CityTexas 8.2
- 123Des PlainesIllinois 8.2
- 123TrentonNew Jersey 8.2
- 123El CajonCalifornia 8.2
- 123OaklandCalifornia 8.2
- 123WoodlandCalifornia 8.2
- 123SpokaneWashington 8.2
- 123SunnysideWashington 8.2
- 133JacksonvilleFlorida 8.1
- 133New OrleansLouisiana 8.1
- 133PhiladelphiaPennsylvania 8.1
- 133SpartanburgSouth Carolina 8.1
- 133DallasTexas 8.1
- 133ClevelandOhio 8.1
- 139GadsdenAlabama 8.0
- 139LakelandFlorida 8.0
- 139Winter ParkFlorida 8.0
- 139WaterlooIowa 8.0
- 139CoventryRhode Island 8.0
- 139GlendoraCalifornia 8.0
- 139MantecaCalifornia 8.0
- 139San JoseCalifornia 8.0
- 139AltamontOregon 8.0
- 139MillcreekUtah 8.0
- 139CentraliaWashington 8.0
- 150HuntsvilleAlabama 7.9
- 150MontgomeryAlabama 7.9
- 150Fruit CoveFlorida 7.9
- 150ColumbusGeorgia 7.9
- 150South LaurelMaryland 7.9
- 150NashvilleTennessee 7.9
- 150ChicagoIllinois 7.9
- 150Arroyo GrandeCalifornia 7.9
- 150SacramentoCalifornia 7.9
- 150SalinasCalifornia 7.9
- 150Coeur d'AleneIdaho 7.9
- 150MedfordOregon 7.9
- 150WoodburnOregon 7.9
- 150SeattleWashington 7.9
- 164Delray BeachFlorida 7.8
- 164MiamiFlorida 7.8
- 164ValricoFlorida 7.8
- 164LawrencevilleGeorgia 7.8
- 164CharlotteNorth Carolina 7.8
- 164New BrunswickNew Jersey 7.8
- 164TucsonArizona 7.8
- 164VictorvilleCalifornia 7.8
- 164HelenaMontana 7.8
- 164HillsboroOregon 7.8
- 164AuburnWashington 7.8
- 164TacomaWashington 7.8
- 164BadgerAlaska 7.8
- 177WellingtonFlorida 7.7
- 177BrunswickGeorgia 7.7
- 177McDonoughGeorgia 7.7
- 177EvansvilleIndiana 7.7
- 177JeffersonvilleIndiana 7.7
- 177Winston-SalemNorth Carolina 7.7
- 177GreenvilleSouth Carolina 7.7
- 177Franklin ParkIllinois 7.7
- 177GaryIndiana 7.7
- 177West MifflinPennsylvania 7.7
- 177El CentroCalifornia 7.7
- 188Fort LauderdaleFlorida 7.6
- 188RaleighNorth Carolina 7.6
- 188FlorenceSouth Carolina 7.6
- 188GalvestonTexas 7.6
- 188PasadenaTexas 7.6
- 188PeoriaIllinois 7.6
- 188KalamazooMichigan 7.6
- 188NogalesArizona 7.6
- 188Sunland ParkNew Mexico 7.6
- 188MoscowIdaho 7.6
- 188Grants PassOregon 7.6
- 199PaducahKentucky 7.5
- 199Belle GladeFlorida 7.5
- 199SarasotaFlorida 7.5
- 199MiddletownOhio 7.5
- 199KnoxvilleTennessee 7.5
- 199MuscatineIowa 7.5
- 199MolineIllinois 7.5
- 199HollandMichigan 7.5
- 199LancasterPennsylvania 7.5
- 199PowayCalifornia 7.5
- 199Santa BarbaraCalifornia 7.5
- 199DenverColorado 7.5
- 199Port AngelesWashington 7.5
- 212Lake MaryFlorida 7.4
- 212Warner RobinsGeorgia 7.4
- 212SpringfieldIllinois 7.4
- 212FishersIndiana 7.4
- 212LexingtonNorth Carolina 7.4
- 212MorrisvilleNorth Carolina 7.4
- 212CaryIllinois 7.4
- 212PortlandMaine 7.4
- 212Grand RapidsMichigan 7.4
- 212Carson CityNevada 7.4
- 212Las VegasNevada 7.4
- 212Salmon CreekWashington 7.4
- 212La Crescenta-Montroselow-cost sensorsCalifornia 7.4
- 225SpringdaleArkansas 7.3
- 225JeffersontownKentucky 7.3
- 225AnkenyIowa 7.3
- 225EwingNew Jersey 7.3
- 225New York CityNew York 7.3
- 225CanbyOregon 7.3
- 225HermistonOregon 7.3
- 232WilmingtonDelaware 7.2
- 232JasperIndiana 7.2
- 232WichitaKansas 7.2
- 232Saint MatthewsKentucky 7.2
- 232NorwoodOhio 7.2
- 232HammondIndiana 7.2
- 232South BendIndiana 7.2
- 232Santa ClaritaCalifornia 7.2
- 232WenatcheeWashington 7.2
- 241DavieFlorida 7.1
- 241Deerfield BeachFlorida 7.1
- 241LemayMissouri 7.1
- 241SpringfieldOhio 7.1
- 241DyersburgTennessee 7.1
- 241Lincoln ParkMichigan 7.1
- 241RedfordMichigan 7.1
- 241Fort LeeNew Jersey 7.1
- 241ChicoCalifornia 7.1
- 241TruckeeCalifornia 7.1
- 241ShorelineWashington 7.1
- 241AnchorageAlaska 7.1
- 253DerbyKansas 7.0
- 253Kansas CityKansas 7.0
- 253University CityMissouri 7.0
- 253GreenvilleNorth Carolina 7.0
- 253JenksOklahoma 7.0
- 253ChesterPennsylvania 7.0
- 253ShakopeeMinnesota 7.0
- 253LindenNew Jersey 7.0
- 253LebanonPennsylvania 7.0
- 253RosevilleCalifornia 7.0
- 253ReddingCalifornia 7.0
- 253Moses LakeWashington 7.0
- 265WashingtonDistrict of Columbia 6.9
- 265PennsaukenNew Jersey 6.9
- 265TulsaOklahoma 6.9
- 265North CharlestonSouth Carolina 6.9
- 265PortageIndiana 6.9
- 265Port HuronMichigan 6.9
- 265Agouralow-cost sensorsCalifornia 6.9
- 265Fort CollinsColorado 6.9
- 265GreeleyColorado 6.9
- 274AthensGeorgia 6.8
- 274Upper AltonIllinois 6.8
- 274Saint JosephMissouri 6.8
- 274MooreOklahoma 6.8
- 274ChesapeakeVirginia 6.8
- 274RichmondVirginia 6.8
- 274BurnsvilleMinnesota 6.8
- 274MilwaukeeWisconsin 6.8
- 274WaukeshaWisconsin 6.8
- 274MesaArizona 6.8
- 274BanningCalifornia 6.8
- 285PrichardAlabama 6.7
- 285DoverDelaware 6.7
- 285ClaytonNorth Carolina 6.7
- 285CincinnatiOhio 6.7
- 285DaytonOhio 6.7
- 285La PorteTexas 6.7
- 285New HavenConnecticut 6.7
- 285WestervilleOhio 6.7
- 285UkiahCalifornia 6.7
- 285Rio RanchoNew Mexico 6.7
- 295Safety HarborFlorida 6.6
- 295San AntonioTexas 6.6
- 295East HamptonVirginia 6.6
- 295HartfordConnecticut 6.6
- 295BostonMassachusetts 6.6
- 295AugustaMaine 6.6
- 295Jersey CityNew Jersey 6.6
- 295YoungstownOhio 6.6
- 295ThorntonColorado 6.6
- 295NampaIdaho 6.6
- 295RexburgIdaho 6.6
- 295DallasOregon 6.6
- 295PortlandOregon 6.6
- 295MagnaUtah 6.6
- 295West JordanUtah 6.6
- 295VancouverWashington 6.6
- 295Arden-ArcadeCalifornia 6.6
- 312BearDelaware 6.5
- 312ArnoldMissouri 6.5
- 312Atlantic CityNew Jersey 6.5
- 312New LondonConnecticut 6.5
- 312WaterburyConnecticut 6.5
- 312LafayetteIndiana 6.5
- 312WorcesterMassachusetts 6.5
- 312MinneapolisMinnesota 6.5
- 312Saint PaulMinnesota 6.5
- 312PatersonNew Jersey 6.5
- 312CantonOhio 6.5
- 312RenoNevada 6.5
- 312LongviewWashington 6.5
- 312Walla WallaWashington 6.5
- 326Terre HauteIndiana 6.4
- 326ElktonMaryland 6.4
- 326ConwaySouth Carolina 6.4
- 326AustinTexas 6.4
- 326Fort WorthTexas 6.4
- 326WarrenOhio 6.4
- 326SocorroTexas 6.4
- 326BeavertonOregon 6.4
- 326Salt Lake CityUtah 6.4
- 335Palm CityFlorida 6.3
- 335EdgewoodMaryland 6.3
- 335ClemmonsNorth Carolina 6.3
- 335South VinelandNew Jersey 6.3
- 335Oklahoma CityOklahoma 6.3
- 335Mission BendTexas 6.3
- 335AndersonIndiana 6.3
- 335SpringfieldMassachusetts 6.3
- 335TaylorMichigan 6.3
- 335KenmoreNew York 6.3
- 335HarrisburgPennsylvania 6.3
- 335South MilwaukeeWisconsin 6.3
- 335GaltCalifornia 6.3
- 335Lake ElsinoreCalifornia 6.3
- 335LivermoreCalifornia 6.3
- 335NipomoCalifornia 6.3
- 335ParadiseCalifornia 6.3
- 335San LeandroCalifornia 6.3
- 335HighlandUtah 6.3
- 354FairhopeAlabama 6.2
- 354WestonFlorida 6.2
- 354New AlbanyIndiana 6.2
- 354OlatheKansas 6.2
- 354PleasantvilleNew Jersey 6.2
- 354White OakOhio 6.2
- 354CorsicanaTexas 6.2
- 354BrocktonMassachusetts 6.2
- 354Fall RiverMassachusetts 6.2
- 354HaverhillMassachusetts 6.2
- 354Lexingtonlow-cost sensorsMassachusetts 6.2
- 354AkronOhio 6.2
- 354SteubenvilleOhio 6.2
- 354BridgeportConnecticut 6.2
- 354DavisCalifornia 6.2
- 354LompocCalifornia 6.2
- 354Thousand OaksCalifornia 6.2
- 354Forest GroveOregon 6.2
- 354McMinnvilleOregon 6.2
- 354Spanish ForkUtah 6.2
- 374Saint AndrewsSouth Carolina 6.1
- 374CookevilleTennessee 6.1
- 374QuincyMassachusetts 6.1
- 374JenisonMichigan 6.1
- 374YpsilantiMichigan 6.1
- 374Apple ValleyMinnesota 6.1
- 374PainesvilleOhio 6.1
- 374McKeesportPennsylvania 6.1
- 374MaranaArizona 6.1
- 374South Lake TahoeCalifornia 6.1
- 374GreshamOregon 6.1
- 374EllensburgWashington 6.1
- 386DecaturAlabama 6.0
- 386Palm BayFlorida 6.0
- 386MasonOhio 6.0
- 386PortsmouthOhio 6.0
- 386Rose HillVirginia 6.0
- 386ZionIllinois 6.0
- 386ElkhartIndiana 6.0
- 386LowellMassachusetts 6.0
- 386BlaineMinnesota 6.0
- 386RochesterMinnesota 6.0
- 386BethlehemPennsylvania 6.0
- 386BoiseIdaho 6.0
- 386Rapid CitySouth Dakota 6.0
- 399TopekaKansas 5.9
- 399AshlandKentucky 5.9
- 399ElizabethtownKentucky 5.9
- 399Hunt ValleyMaryland 5.9
- 399FayettevilleNorth Carolina 5.9
- 399HendersonvilleTennessee 5.9
- 399NorristownPennsylvania 5.9
- 399ScrantonPennsylvania 5.9
- 399PleasantonCalifornia 5.9
- 399Santa CruzCalifornia 5.9
- 399Spanish SpringsNevada 5.9
- 399PendletonOregon 5.9
- 411DurhamNorth Carolina 5.8
- 411EdmondOklahoma 5.8
- 411SpringfieldVirginia 5.8
- 411CharlestonWest Virginia 5.8
- 411DanburyConnecticut 5.8
- 411Des MoinesIowa 5.8
- 411Saint CloudMinnesota 5.8
- 411OmahaNebraska 5.8
- 411KeeneNew Hampshire 5.8
- 411MedinaOhio 5.8
- 411PittsburghPennsylvania 5.8
- 411ReadingPennsylvania 5.8
- 411MadisonWisconsin 5.8
- 411AlbuquerqueNew Mexico 5.8
- 425BloomingtonIndiana 5.7
- 425BaltimoreMaryland 5.7
- 425MaryvilleTennessee 5.7
- 425Saint MichaelMinnesota 5.7
- 425AllentownPennsylvania 5.7
- 425WilkinsburgPennsylvania 5.7
- 425LongmontColorado 5.7
- 425BillingsMontana 5.7
- 425BellinghamWashington 5.7
- 425PullmanWashington 5.7
- 435Fort ThomasKentucky 5.6
- 435Roanoke RapidsNorth Carolina 5.6
- 435ColumbiaTennessee 5.6
- 435LaredoTexas 5.6
- 435Live OakTexas 5.6
- 435SaginawTexas 5.6
- 435HopewellVirginia 5.6
- 435GreenfieldMassachusetts 5.6
- 435LynnMassachusetts 5.6
- 435LansingMichigan 5.6
- 435PortsmouthNew Hampshire 5.6
- 435AlbanyNew York 5.6
- 435BurlingtonVermont 5.6
- 435FillmoreCalifornia 5.6
- 435LincolnCalifornia 5.6
- 435San Luis ObispoCalifornia 5.6
- 435Simi ValleyCalifornia 5.6
- 435Coos BayOregon 5.6
- 453LebanonOhio 5.5
- 453McAlesterOklahoma 5.5
- 453KokomoIndiana 5.5
- 453BuffaloNew York 5.5
- 453CarlislePennsylvania 5.5
- 453MilwaukieOregon 5.5
- 453FairbanksAlaska 5.5
- 460Fort SmithArkansas 5.4
- 460NewarkDelaware 5.4
- 460ClarksvilleTennessee 5.4
- 460CharlottesvilleVirginia 5.4
- 460Bay CityMichigan 5.4
- 460Shaker HeightsOhio 5.4
- 460Casas AdobesArizona 5.4
- 460Ken CarylColorado 5.4
- 460ButteMontana 5.4
- 460The DallesOregon 5.4
- 460BountifulUtah 5.4
- 460OremUtah 5.4
- 460Tri-CitiesWashington 5.4
- 473Corpus ChristiTexas 5.3
- 473Cleveland HeightsOhio 5.3
- 473BayonneNew Jersey 5.3
- 473RutlandVermont 5.3
- 473OdessaTexas 5.3
- 473BendOregon 5.3
- 479Kansas CityMissouri 5.2
- 479DentonTexas 5.2
- 479West FargoNorth Dakota 5.2
- 479NewburghNew York 5.2
- 479WheelingWest Virginia 5.2
- 479Cedar CityUtah 5.2
- 485ColumbusIndiana 5.1
- 485Lexington-FayetteKentucky 5.1
- 485RockvilleMaryland 5.1
- 485RoanokeVirginia 5.1
- 485LewistonMaine 5.1
- 485LimaOhio 5.1
- 485AppletonWisconsin 5.1
- 485Eau ClaireWisconsin 5.1
- 485MeridianIdaho 5.1
- 485BremertonWashington 5.1
- 485LaceyWashington 5.1
- 496KingsportTennessee 5.0
- 496EdinburgTexas 5.0
- 496White PlainsNew York 5.0
- 496AltoonaPennsylvania 5.0
- 496San RafaelCalifornia 5.0
- 496HendersonNevada 5.0
- 496BismarckNorth Dakota 5.0
- 496AshlandOregon 5.0
- 504ScaggsvilleMaryland 4.9
- 504AshevilleNorth Carolina 4.9
- 504College StationTexas 4.9
- 504North ChicopeeMassachusetts 4.9
- 504RochesterNew York 4.9
- 504UticaNew York 4.9
- 504Green BayWisconsin 4.9
- 504Eagle PassTexas 4.9
- 504Twin FallsIdaho 4.9
- 504MissoulaMontana 4.9
- 504AberdeenWashington 4.9
- 504Mount VernonWashington 4.9
- 516SpringfieldMissouri 4.8
- 516LawtonOklahoma 4.8
- 516PittsfieldMassachusetts 4.8
- 516DerryNew Hampshire 4.8
- 516State CollegePennsylvania 4.8
- 516La CrosseWisconsin 4.8
- 516ConcordCalifornia 4.8
- 516CondaIdaho 4.8
- 524BeltonTexas 4.7
- 524BellevueNebraska 4.7
- 524LincolnNebraska 4.7
- 524HermitagePennsylvania 4.7
- 524TracyCalifornia 4.7
- 524Colorado SpringsColorado 4.7
- 524HerrimanUtah 4.7
- 531Spring ValleyNevada 4.6
- 531AmarilloTexas 4.6
- 531HurricaneUtah 4.6
- 534LaconiaNew Hampshire 4.5
- 534Las CrucesNew Mexico 4.5
- 536FlintMichigan 4.4
- 536SuperiorWisconsin 4.4
- 536HollisterCalifornia 4.4
- 539HagerstownMaryland 4.3
- 539DuluthMinnesota 4.3
- 539New CityNew York 4.3
- 539GahannaOhio 4.3
- 539EriePennsylvania 4.3
- 544AdaOklahoma 4.2
- 544BangorMaine 4.2
- 544SyracuseNew York 4.2
- 544Weirton HeightsWest Virginia 4.2
- 548LibertyMissouri 4.1
- 548AtascaderoCalifornia 4.1
- 548EnterpriseNevada 4.1
- 548Apache JunctionArizona 4.1
- 548BozemanMontana 4.1
- 548TooeleUtah 4.1
- 548GilletteWyoming 4.1
- 555RaymoreMissouri 4.0
- 555AberdeenSouth Dakota 4.0
- 555BellevueWashington 4.0
- 555CheyenneWyoming 4.0
- 559Grand IslandNebraska 3.9
- 559ToledoOhio 3.9
- 559Grand JunctionColorado 3.9
- 559Idaho FallsIdaho 3.9
- 563North OgdenUtah 3.8
- 563Makakilo / Kapolei / Honokai HaleHawaii 3.8
- 565LancasterCalifornia 3.7
- 565Santa RosaCalifornia 3.7
- 565VacavilleCalifornia 3.7
- 565MesquiteNevada 3.7
- 565LubbockTexas 3.7
- 565IssaquahWashington 3.7
- 571OrcuttCalifornia 3.6
- 571Rock SpringsWyoming 3.6
- 571Summerlin SouthNevada 3.6
- 574Oak HarborWashington 3.5
- 574PascoWashington 3.5
- 576Boulder CityNevada 3.4
- 577BrookingsSouth Dakota 3.3
- 577Sioux FallsSouth Dakota 3.3
- 577Green ValleyArizona 3.3
- 577GilroyCalifornia 3.3
- 577CasperWyoming 3.3
- 582HonoluluHawaii 3.1
- 583PocatelloIdaho 2.9
- 584LaramieWyoming 2.8
- 585CorvallisOregon 2.7
- 585HiloHawaii 2.7
- 587KahuluiHawaii 2.4
- 587KīheiHawaii 2.4
- 589MarysvilleWashington 1.5
- 590AnacortesWashington 1.2
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+