SmogRank / Countries / United States / January 2024
Most polluted cities in United States, January 2024
596 cities in United States ranked by their average PM2.5 over the 31 days. Worst: Badger at 24.1 µg/m³, #128 of 1,960 cities in the world. Cleanest: Marysville at 0.9. A city needs measurements on 70% of the days to be ranked.
- 1BadgerAlaska 24.1
- 2NogalesArizona 18.6
- 3PhoenixArizona 16.5
- 4HelenaMontana 15.7
- 5CalexicoCalifornia 15.6
- 6FairbanksAlaska 14.8
- 7BakersfieldCalifornia 14.6
- 7ComptonCalifornia 14.6
- 9HanfordCalifornia 14.5
- 10FresnoCalifornia 14.4
- 11RedfordMichigan 13.7
- 12VisaliaCalifornia 13.6
- 13Jurupa ValleyCalifornia 13.3
- 14Kansas CityKansas 13.1
- 15DearbornMichigan 13.0
- 15BoiseIdaho 13.0
- 17ButteMontana 12.9
- 18BensalemPennsylvania 12.8
- 19Hawthornelow-cost sensorsCalifornia 12.6
- 20StocktonCalifornia 12.5
- 21Carsonlow-cost sensorsCalifornia 12.3
- 22HoustonTexas 12.2
- 23Los AngelesCalifornia 12.0
- 23MercedCalifornia 12.0
- 25San AntonioTexas 11.9
- 26CorcoranCalifornia 11.6
- 27Lake ElsinoreCalifornia 11.5
- 27RiversideCalifornia 11.5
- 27MillcreekUtah 11.5
- 30GlendaleArizona 11.3
- 30BurbankCalifornia 11.3
- 30Torrancelow-cost sensorsCalifornia 11.3
- 33Las VegasNevada 11.2
- 34IndioCalifornia 11.0
- 34TurlockCalifornia 11.0
- 34YakimaWashington 11.0
- 37FontanaCalifornia 10.9
- 38NampaIdaho 10.8
- 39Missouri CityTexas 10.7
- 39LancasterPennsylvania 10.7
- 39ModestoCalifornia 10.7
- 42BurnsvilleMinnesota 10.6
- 42RichmondCalifornia 10.6
- 44East RidgeTennessee 10.5
- 44DetroitMichigan 10.5
- 44Lincoln ParkMichigan 10.5
- 47PasadenaTexas 10.4
- 47ToledoOhio 10.4
- 49DurhamNorth Carolina 10.3
- 49HarrisburgPennsylvania 10.3
- 49Long BeachCalifornia 10.3
- 52Franklin ParkIllinois 10.2
- 52West JordanUtah 10.2
- 54Grand RapidsMichigan 10.1
- 54ElizabethNew Jersey 10.1
- 54Inglewoodlow-cost sensorsCalifornia 10.1
- 54MeridianIdaho 10.1
- 54SunnysideWashington 10.1
- 59BrookfieldIllinois 10.0
- 59CarlislePennsylvania 10.0
- 59Great FallsMontana 10.0
- 62YorkPennsylvania 9.9
- 62WaterlooIowa 9.9
- 62AnaheimCalifornia 9.9
- 62ClovisCalifornia 9.9
- 66BirminghamAlabama 9.8
- 66LebanonPennsylvania 9.8
- 66LewistonIdaho 9.8
- 69Oak LawnIllinois 9.7
- 69MaderaCalifornia 9.7
- 69Salt Lake CityUtah 9.7
- 72OcalaFlorida 9.6
- 72East ChicagoIndiana 9.6
- 74Fort LauderdaleFlorida 9.5
- 74MiamiFlorida 9.5
- 74HollandMichigan 9.5
- 74MinneapolisMinnesota 9.5
- 74TempeArizona 9.5
- 79Saint PaulMinnesota 9.4
- 79ClevelandOhio 9.4
- 79MesaArizona 9.4
- 79PortervilleCalifornia 9.4
- 83KennesawGeorgia 9.3
- 83EdmondOklahoma 9.3
- 83ShakopeeMinnesota 9.3
- 83Chula VistaCalifornia 9.3
- 87PhiladelphiaPennsylvania 9.2
- 87DallasTexas 9.2
- 87Calumet CityIllinois 9.2
- 87PendletonOregon 9.2
- 87AnchorageAlaska 9.2
- 92ColumbusGeorgia 9.1
- 92El CentroCalifornia 9.1
- 94JenisonMichigan 9.0
- 94KalamazooMichigan 9.0
- 94Eau ClaireWisconsin 9.0
- 94GreeleyColorado 9.0
- 94MagnaUtah 9.0
- 99LafayetteIndiana 8.9
- 99Port HuronMichigan 8.9
- 101IndianapolisIndiana 8.8
- 101TaylorMichigan 8.8
- 101Fort LeeNew Jersey 8.8
- 101San DiegoCalifornia 8.8
- 101DenverColorado 8.8
- 106AlbanyGeorgia 8.7
- 106BaytownTexas 8.7
- 106ChicagoIllinois 8.7
- 106NapervilleIllinois 8.7
- 106El CajonCalifornia 8.7
- 106El PasoTexas 8.7
- 112St. LouisMissouri 8.6
- 112Bay CityMichigan 8.6
- 112YpsilantiMichigan 8.6
- 112BlaineMinnesota 8.6
- 116Deerfield BeachFlorida 8.5
- 116LafayetteLouisiana 8.5
- 116SulphurLouisiana 8.5
- 116ColumbusOhio 8.5
- 116ConroeTexas 8.5
- 116Mission BendTexas 8.5
- 116ClintonIowa 8.5
- 116Fort WayneIndiana 8.5
- 116BellevueNebraska 8.5
- 116NewburghNew York 8.5
- 116South MilwaukeeWisconsin 8.5
- 116MantecaCalifornia 8.5
- 116Redwood CityCalifornia 8.5
- 116ThorntonColorado 8.5
- 116BountifulUtah 8.5
- 131East LakeFlorida 8.4
- 131BartlettTennessee 8.4
- 131Iowa CityIowa 8.4
- 131Apple ValleyMinnesota 8.4
- 131Lomitalow-cost sensorsCalifornia 8.4
- 131Santa Monicalow-cost sensorsCalifornia 8.4
- 131BozemanMontana 8.4
- 138WilmingtonDelaware 8.3
- 138Coconut CreekFlorida 8.3
- 138FlintMichigan 8.3
- 138ReadingPennsylvania 8.3
- 138Rio RanchoNew Mexico 8.3
- 138MissoulaMontana 8.3
- 138RentonWashington 8.3
- 145HomesteadFlorida 8.2
- 145LexingtonNorth Carolina 8.2
- 145Oklahoma CityOklahoma 8.2
- 145ChesterPennsylvania 8.2
- 145Fort WorthTexas 8.2
- 145RockfordIllinois 8.2
- 145ElkhartIndiana 8.2
- 145RochesterMinnesota 8.2
- 145DublinOhio 8.2
- 145AppletonWisconsin 8.2
- 145Casas AdobesArizona 8.2
- 156TrussvilleAlabama 8.1
- 156EdinburgTexas 8.1
- 156GaryIndiana 8.1
- 156Green BayWisconsin 8.1
- 156MilwaukeeWisconsin 8.1
- 156Fort CollinsColorado 8.1
- 162TampaFlorida 8.0
- 162Winter ParkFlorida 8.0
- 162AugustaGeorgia 8.0
- 162KokomoIndiana 8.0
- 162Saint MichaelMinnesota 8.0
- 162NorristownPennsylvania 8.0
- 162MadisonWisconsin 8.0
- 162RenoNevada 8.0
- 162Port AngelesWashington 8.0
- 162La Crescenta-Montroselow-cost sensorsCalifornia 8.0
- 172NewarkDelaware 7.9
- 172JenksOklahoma 7.9
- 172Ponca CityOklahoma 7.9
- 172AshburnVirginia 7.9
- 172Des PlainesIllinois 7.9
- 172GreenfieldMassachusetts 7.9
- 172BayonneNew Jersey 7.9
- 172LimaOhio 7.9
- 172WestervilleOhio 7.9
- 172North OgdenUtah 7.9
- 182ValricoFlorida 7.8
- 182ValdostaGeorgia 7.8
- 182Terre HauteIndiana 7.8
- 182HagerstownMaryland 7.8
- 182FayettevilleNorth Carolina 7.8
- 182MiddletownOhio 7.8
- 182AustinTexas 7.8
- 182Live OakTexas 7.8
- 182SaginawTexas 7.8
- 182JolietIllinois 7.8
- 182HammondIndiana 7.8
- 182Saint CloudMinnesota 7.8
- 182UticaNew York 7.8
- 182SocorroTexas 7.8
- 182LongmontColorado 7.8
- 182MedfordOregon 7.8
- 182OremUtah 7.8
- 199HueytownAlabama 7.7
- 199Bonita SpringsFlorida 7.7
- 199East Saint LouisIllinois 7.7
- 199ColumbusIndiana 7.7
- 199KnoxvilleTennessee 7.7
- 199LaredoTexas 7.7
- 199DavenportIowa 7.7
- 199NorthbrookIllinois 7.7
- 199White PlainsNew York 7.7
- 199PittsburghPennsylvania 7.7
- 199West MifflinPennsylvania 7.7
- 199Agouralow-cost sensorsCalifornia 7.7
- 199BrawleyCalifornia 7.7
- 199RoseburgOregon 7.7
- 199The DallesOregon 7.7
- 199Walla WallaWashington 7.7
- 199Arden-ArcadeCalifornia 7.7
- 216ChalmetteLouisiana 7.6
- 216Hunt ValleyMaryland 7.6
- 216ScaggsvilleMaryland 7.6
- 216HattiesburgMississippi 7.6
- 216ClemmonsNorth Carolina 7.6
- 216GalvestonTexas 7.6
- 216MolineIllinois 7.6
- 216LansingMichigan 7.6
- 216EwingNew Jersey 7.6
- 216KenmoreNew York 7.6
- 216CantonOhio 7.6
- 216MedinaOhio 7.6
- 216WenatcheeWashington 7.6
- 216Tri-CitiesWashington 7.6
- 230JasperIndiana 7.5
- 230PennsaukenNew Jersey 7.5
- 230NorwoodOhio 7.5
- 230PortageIndiana 7.5
- 230South BendIndiana 7.5
- 230OmahaNebraska 7.5
- 230LindenNew Jersey 7.5
- 230New CityNew York 7.5
- 230Shaker HeightsOhio 7.5
- 230SteubenvilleOhio 7.5
- 230WaukeshaWisconsin 7.5
- 230ChicoCalifornia 7.5
- 242Phenix CityAlabama 7.4
- 242DoverDelaware 7.4
- 242VeniceFlorida 7.4
- 242Granite CityIllinois 7.4
- 242JeffersonvilleIndiana 7.4
- 242LouisvilleKentucky 7.4
- 242BaltimoreMaryland 7.4
- 242Saint JosephMissouri 7.4
- 242White OakOhio 7.4
- 242SpartanburgSouth Carolina 7.4
- 242PeoriaIllinois 7.4
- 242AkronOhio 7.4
- 242BethlehemPennsylvania 7.4
- 242TucsonArizona 7.4
- 242Columbia CityWashington 7.4
- 257Baton RougeLouisiana 7.3
- 257JacksonMississippi 7.3
- 257PascagoulaMississippi 7.3
- 257MooreOklahoma 7.3
- 257Port ArthurTexas 7.3
- 257SpringfieldVirginia 7.3
- 257CharlestonWest Virginia 7.3
- 257SacramentoCalifornia 7.3
- 257TooeleUtah 7.3
- 266GadsdenAlabama 7.2
- 266LawrencevilleGeorgia 7.2
- 266EvansvilleIndiana 7.2
- 266KennerLouisiana 7.2
- 266SpringfieldOhio 7.2
- 266New York CityNew York 7.2
- 266MaranaArizona 7.2
- 266AuburnWashington 7.2
- 274Lake MaryFlorida 7.1
- 274TallahasseeFlorida 7.1
- 274BrunswickGeorgia 7.1
- 274EdgewoodMaryland 7.1
- 274DaytonOhio 7.1
- 274GreenvilleSouth Carolina 7.1
- 274Corpus ChristiTexas 7.1
- 274KeeneNew Hampshire 7.1
- 274RochesterNew York 7.1
- 274OceansideCalifornia 7.1
- 274EllensburgWashington 7.1
- 274TacomaWashington 7.1
- 286Fort SmithArkansas 7.0
- 286LakelandFlorida 7.0
- 286Ponte Vedra BeachFlorida 7.0
- 286GreensboroNorth Carolina 7.0
- 286CincinnatiOhio 7.0
- 286TulsaOklahoma 7.0
- 286DuluthMinnesota 7.0
- 286LincolnNebraska 7.0
- 286AllentownPennsylvania 7.0
- 286SuperiorWisconsin 7.0
- 286GlendoraCalifornia 7.0
- 286Santa ClaritaCalifornia 7.0
- 286WoodlandCalifornia 7.0
- 286OdessaTexas 7.0
- 286Candler-McAfeeGeorgia 7.0
- 286MidwayFlorida 7.0
- 302HuntsvilleAlabama 6.9
- 302MontgomeryAlabama 6.9
- 302TopekaKansas 6.9
- 302Kansas CityMissouri 6.9
- 302RaleighNorth Carolina 6.9
- 302MaryvilleTennessee 6.9
- 302HarrisonburgVirginia 6.9
- 302Cleveland HeightsOhio 6.9
- 302ZionIllinois 6.9
- 302WarrenOhio 6.9
- 302WheelingWest Virginia 6.9
- 302BanningCalifornia 6.9
- 302Yuba CityCalifornia 6.9
- 302Eagle PassTexas 6.9
- 302BillingsMontana 6.9
- 317Delray BeachFlorida 6.8
- 317SavannahGeorgia 6.8
- 317DecaturIllinois 6.8
- 317BloomingtonIndiana 6.8
- 317OlatheKansas 6.8
- 317Valley StationKentucky 6.8
- 317BloomingtonIllinois 6.8
- 317CaryIllinois 6.8
- 317YoungstownOhio 6.8
- 317State CollegePennsylvania 6.8
- 317Casa GrandeArizona 6.8
- 317VictorvilleCalifornia 6.8
- 317Colorado SpringsColorado 6.8
- 317Carson CityNevada 6.8
- 317ParklandWashington 6.8
- 332DavieFlorida 6.7
- 332MaconGeorgia 6.7
- 332ShreveportLouisiana 6.7
- 332GulfportMississippi 6.7
- 332HickoryNorth Carolina 6.7
- 332FlorenceSouth Carolina 6.7
- 332ChattanoogaTennessee 6.7
- 332La PorteTexas 6.7
- 332AnkenyIowa 6.7
- 332ScrantonPennsylvania 6.7
- 332AlbuquerqueNew Mexico 6.7
- 332Grants PassOregon 6.7
- 332Spanish ForkUtah 6.7
- 332PascoWashington 6.7
- 346WashingtonDistrict of Columbia 6.6
- 346Safety HarborFlorida 6.6
- 346WellingtonFlorida 6.6
- 346WestonFlorida 6.6
- 346Winston-SalemNorth Carolina 6.6
- 346PortsmouthOhio 6.6
- 346HendersonvilleTennessee 6.6
- 346HartfordConnecticut 6.6
- 346AndersonIndiana 6.6
- 346San JoseCalifornia 6.6
- 356PrichardAlabama 6.5
- 356SpringfieldIllinois 6.5
- 356FishersIndiana 6.5
- 356JeffersontownKentucky 6.5
- 356ElktonMaryland 6.5
- 356University CityMissouri 6.5
- 356CharlotteNorth Carolina 6.5
- 356Rose HillVirginia 6.5
- 356BuffaloNew York 6.5
- 356JohnstownPennsylvania 6.5
- 356RosevilleCalifornia 6.5
- 367West MemphisArkansas 6.4
- 367BearDelaware 6.4
- 367Daytona BeachFlorida 6.4
- 367GainesvilleGeorgia 6.4
- 367Warner RobinsGeorgia 6.4
- 367Upper AltonIllinois 6.4
- 367DanburyConnecticut 6.4
- 367AugustaMaine 6.4
- 367TrentonNew Jersey 6.4
- 367AlbanyNew York 6.4
- 367WilkinsburgPennsylvania 6.4
- 367WeirtonWest Virginia 6.4
- 367LongviewWashington 6.4
- 367Makakilo / Kapolei / Honokai HaleHawaii 6.4
- 381Little RockArkansas 6.3
- 381SpringdaleArkansas 6.3
- 381Ferry PassFlorida 6.3
- 381CorsicanaTexas 6.3
- 381DentonTexas 6.3
- 381TexarkanaTexas 6.3
- 381Des MoinesIowa 6.3
- 381SpringfieldMassachusetts 6.3
- 381BurlingtonVermont 6.3
- 381RutlandVermont 6.3
- 381SpokaneWashington 6.3
- 381HonoluluHawaii 6.3
- 393JacksonvilleFlorida 6.2
- 393RockvilleMaryland 6.2
- 393MorrisvilleNorth Carolina 6.2
- 393Lexingtonlow-cost sensorsMassachusetts 6.2
- 393McKeesportPennsylvania 6.2
- 398New AlbanyIndiana 6.1
- 398ElizabethtownKentucky 6.1
- 398Saint MatthewsKentucky 6.1
- 398ArnoldMissouri 6.1
- 398North CharlestonSouth Carolina 6.1
- 398BeltonTexas 6.1
- 398HuntingtonWest Virginia 6.1
- 398PortlandMaine 6.1
- 398PatersonNew Jersey 6.1
- 398UkiahCalifornia 6.1
- 398BismarckNorth Dakota 6.1
- 409LemayMissouri 6.0
- 409HernandoMississippi 6.0
- 409Toms RiverNew Jersey 6.0
- 409CharlottesvilleVirginia 6.0
- 409WaterburyConnecticut 6.0
- 409AberdeenSouth Dakota 6.0
- 409YumaArizona 6.0
- 409GaltCalifornia 6.0
- 409LincolnCalifornia 6.0
- 409TruckeeCalifornia 6.0
- 409ReddingCalifornia 6.0
- 409Moses LakeWashington 6.0
- 421AtlantaGeorgia 5.9
- 421AshlandKentucky 5.9
- 421Fort ThomasKentucky 5.9
- 421New OrleansLouisiana 5.9
- 421College StationTexas 5.9
- 421West FargoNorth Dakota 5.9
- 421Jersey CityNew Jersey 5.9
- 421EriePennsylvania 5.9
- 421HermitagePennsylvania 5.9
- 421BridgeportConnecticut 5.9
- 421PowayCalifornia 5.9
- 421HillsboroOregon 5.9
- 421ShorelineWashington 5.9
- 434PaducahKentucky 5.8
- 434DecaturAlabama 5.8
- 434SarasotaFlorida 5.8
- 434AthensGeorgia 5.8
- 434New HavenConnecticut 5.8
- 434AltoonaPennsylvania 5.8
- 434OaklandCalifornia 5.8
- 434San FranciscoCalifornia 5.8
- 434Simi ValleyCalifornia 5.8
- 434Thousand OaksCalifornia 5.8
- 434EugeneOregon 5.8
- 434SeattleWashington 5.8
- 446Lexington-FayetteKentucky 5.7
- 446ClaytonNorth Carolina 5.7
- 446RichmondVirginia 5.7
- 446MuscatineIowa 5.7
- 446SyracuseNew York 5.7
- 446GahannaOhio 5.7
- 446HollisterCalifornia 5.7
- 446Santa BarbaraCalifornia 5.7
- 446AltamontOregon 5.7
- 446RedmondOregon 5.7
- 446HighlandUtah 5.7
- 446BellinghamWashington 5.7
- 458Saint AndrewsSouth Carolina 5.6
- 458ChesapeakeVirginia 5.6
- 458BostonMassachusetts 5.6
- 461Belle GladeFlorida 5.5
- 461Palm CityFlorida 5.5
- 461LebanonOhio 5.5
- 461LawtonOklahoma 5.5
- 461ProvidenceRhode Island 5.5
- 461PleasantonCalifornia 5.5
- 467Fruit CoveFlorida 5.4
- 467Palm BayFlorida 5.4
- 467DerbyKansas 5.4
- 467SewellNew Jersey 5.4
- 467MasonOhio 5.4
- 467ConwaySouth Carolina 5.4
- 467WorcesterMassachusetts 5.4
- 467PocatelloIdaho 5.4
- 475South VinelandNew Jersey 5.3
- 475Weirton HeightsWest Virginia 5.3
- 475TracyCalifornia 5.3
- 475MoscowIdaho 5.3
- 475Spokane ValleyWashington 5.3
- 480FairhopeAlabama 5.2
- 480GainesvilleFlorida 5.2
- 480LibertyMissouri 5.2
- 480GreenvilleNorth Carolina 5.2
- 480Atlantic CityNew Jersey 5.2
- 480McAlesterOklahoma 5.2
- 480JacksonTennessee 5.2
- 480RoanokeVirginia 5.2
- 480New LondonConnecticut 5.2
- 480BrocktonMassachusetts 5.2
- 480Fall RiverMassachusetts 5.2
- 480North ChicopeeMassachusetts 5.2
- 480BangorMaine 5.2
- 480PawtucketRhode Island 5.2
- 480DavisCalifornia 5.2
- 480VacavilleCalifornia 5.2
- 480BendOregon 5.2
- 497SpringfieldMissouri 5.1
- 497PleasantvilleNew Jersey 5.1
- 497Santa CruzCalifornia 5.1
- 497Grand JunctionColorado 5.1
- 497Spanish SpringsNevada 5.1
- 497Spring ValleyNevada 5.1
- 497AmarilloTexas 5.1
- 497SalemOregon 5.1
- 497CentraliaWashington 5.1
- 506LowellMassachusetts 5.0
- 506HendersonNevada 5.0
- 506TigardOregon 5.0
- 509RaymoreMissouri 4.9
- 509East HamptonVirginia 4.9
- 509PainesvilleOhio 4.9
- 509LivermoreCalifornia 4.9
- 509HobbsNew Mexico 4.9
- 509BremertonWashington 4.9
- 515ColumbiaTennessee 4.8
- 515CookevilleTennessee 4.8
- 515KingsportTennessee 4.8
- 515HaverhillMassachusetts 4.8
- 515QuincyMassachusetts 4.8
- 515Dodge CityKansas 4.8
- 515HerrimanUtah 4.8
- 515LaceyWashington 4.8
- 515VancouverWashington 4.8
- 524PittsfieldMassachusetts 4.7
- 524PortsmouthNew Hampshire 4.7
- 524FolsomCalifornia 4.7
- 524Idaho FallsIdaho 4.7
- 524KahuluiHawaii 4.7
- 529AshevilleNorth Carolina 4.6
- 529DyersburgTennessee 4.6
- 529Arroyo GrandeCalifornia 4.6
- 529ParadiseCalifornia 4.6
- 529Coeur d'AleneIdaho 4.6
- 534LynnMassachusetts 4.5
- 534LewistonMaine 4.5
- 534AtascaderoCalifornia 4.5
- 534ConcordCalifornia 4.5
- 534Santa RosaCalifornia 4.5
- 534Ken CarylColorado 4.5
- 540Roanoke RapidsNorth Carolina 4.4
- 540Apache JunctionArizona 4.4
- 542McDonoughGeorgia 4.3
- 542HopewellVirginia 4.3
- 542DerryNew Hampshire 4.3
- 542SalinasCalifornia 4.3
- 542San LeandroCalifornia 4.3
- 547ClarksvilleTennessee 4.2
- 547Sioux FallsSouth Dakota 4.2
- 549BrookingsSouth Dakota 4.1
- 549AlbanyOregon 4.1
- 549WoodburnOregon 4.1
- 552GilroyCalifornia 3.9
- 552OrcuttCalifornia 3.9
- 552San RafaelCalifornia 3.9
- 552DallasOregon 3.9
- 552Salmon CreekWashington 3.9
- 557Twin FallsIdaho 3.8
- 557AshlandOregon 3.8
- 557HiloHawaii 3.8
- 560EnterpriseNevada 3.7
- 560PortlandOregon 3.7
- 562CoventryRhode Island 3.6
- 562Las CrucesNew Mexico 3.6
- 562LubbockTexas 3.6
- 562BeavertonOregon 3.6
- 562McMinnvilleOregon 3.6
- 567South LaurelMaryland 3.5
- 567LaconiaNew Hampshire 3.5
- 567AberdeenWashington 3.5
- 567Summerlin SouthNevada 3.5
- 571AdaOklahoma 3.4
- 571FillmoreCalifornia 3.4
- 571Mount VernonWashington 3.4
- 571CasperWyoming 3.4
- 575NipomoCalifornia 3.3
- 575CheyenneWyoming 3.3
- 575KīheiHawaii 3.3
- 578South Lake TahoeCalifornia 3.2
- 578Cedar CityUtah 3.2
- 578RandolphNew Jersey 3.2
- 581CanbyOregon 3.1
- 581Coos BayOregon 3.1
- 581Rock SpringsWyoming 3.1
- 584OrchardsWashington 3.0
- 585LompocCalifornia 2.8
- 586Boulder CityNevada 2.7
- 586HurricaneUtah 2.7
- 586BellevueWashington 2.7
- 589Green ValleyArizona 2.6
- 590LancasterCalifornia 2.5
- 590MesquiteNevada 2.5
- 592Oak HarborWashington 2.3
- 592LaramieWyoming 2.3
- 594IssaquahWashington 1.7
- 595AnacortesWashington 1.5
- 596MarysvilleWashington 0.9
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+