SmogRank / Countries / United States / April 2024
Most polluted cities in United States, April 2024
611 cities in United States ranked by their average PM2.5 over the 30 days. Worst: Mission at 18.2 µg/m³, #80 of 1,941 cities in the world. Cleanest: Marysville at 0.9. A city needs measurements on 70% of the days to be ranked.
- 1MissionTexas 18.2
- 2EdinburgTexas 17.5
- 3Ponca CityOklahoma 16.3
- 4LaredoTexas 15.4
- 5LawrencevilleGeorgia 14.8
- 6Corpus ChristiTexas 14.6
- 7DerbyKansas 13.6
- 7Live OakTexas 13.6
- 9SocorroTexas 13.2
- 10Eagle PassTexas 12.9
- 11BrownsvilleTexas 12.7
- 12GainesvilleGeorgia 12.5
- 13BirminghamAlabama 12.3
- 14San AntonioTexas 12.2
- 15WichitaKansas 12.0
- 15AustinTexas 12.0
- 17Forest ParkGeorgia 11.9
- 18FontanaCalifornia 11.8
- 19KennesawGeorgia 11.7
- 20HoustonTexas 11.6
- 21Los AngelesCalifornia 11.5
- 22DurhamNorth Carolina 11.4
- 23ConroeTexas 11.0
- 24Phenix CityAlabama 10.9
- 25HueytownAlabama 10.8
- 25TallahasseeFlorida 10.8
- 25PortervilleCalifornia 10.8
- 28Missouri CityTexas 10.7
- 29GadsdenAlabama 10.3
- 29TrussvilleAlabama 10.3
- 29East RidgeTennessee 10.3
- 32Oklahoma CityOklahoma 10.2
- 32ComptonCalifornia 10.2
- 34OcalaFlorida 10.1
- 34BaytownTexas 10.1
- 34Mission BendTexas 10.1
- 37AugustaGeorgia 10.0
- 37Candler-McAfeeGeorgia 10.0
- 39ColumbusGeorgia 9.9
- 39MaconGeorgia 9.9
- 41AtlantaGeorgia 9.8
- 41DallasTexas 9.8
- 41PasadenaTexas 9.8
- 41San MarcosTexas 9.8
- 41BensalemPennsylvania 9.8
- 46MiamiFlorida 9.7
- 47MooreOklahoma 9.6
- 47FlorenceSouth Carolina 9.6
- 47Saint AndrewsSouth Carolina 9.6
- 50JenksOklahoma 9.5
- 51Fort LauderdaleFlorida 9.4
- 51HanfordCalifornia 9.4
- 53East LakeFlorida 9.3
- 53Ponte Vedra BeachFlorida 9.3
- 53Baton RougeLouisiana 9.3
- 53EdmondOklahoma 9.3
- 53TulsaOklahoma 9.3
- 53AnaheimCalifornia 9.3
- 53El PasoTexas 9.3
- 60Belle GladeFlorida 9.2
- 60McDonoughGeorgia 9.2
- 60MorrisvilleNorth Carolina 9.2
- 60SpartanburgSouth Carolina 9.2
- 60BartlettTennessee 9.2
- 60BurbankCalifornia 9.2
- 60Santa ClaritaCalifornia 9.2
- 67RiversideCalifornia 9.1
- 68VeniceFlorida 9.0
- 68College StationTexas 9.0
- 70Bonita SpringsFlorida 8.9
- 70ChattanoogaTennessee 8.9
- 70BeltonTexas 8.9
- 73Warner RobinsGeorgia 8.8
- 73GreensboroNorth Carolina 8.8
- 73CorsicanaTexas 8.8
- 73IndioCalifornia 8.8
- 77SpringdaleArkansas 8.7
- 77ValdostaGeorgia 8.7
- 77GeorgetownTexas 8.7
- 77TaylorTexas 8.7
- 81PrichardAlabama 8.6
- 81Little RockArkansas 8.6
- 81Lake MaryFlorida 8.6
- 81ShreveportLouisiana 8.6
- 81ConwaySouth Carolina 8.6
- 81GreenvilleSouth Carolina 8.6
- 81Carsonlow-cost sensorsCalifornia 8.6
- 81Hawthornelow-cost sensorsCalifornia 8.6
- 89AthensGeorgia 8.5
- 89LafayetteLouisiana 8.5
- 89LexingtonNorth Carolina 8.5
- 89MidwayFlorida 8.5
- 93MontgomeryAlabama 8.4
- 93ClaytonNorth Carolina 8.4
- 93FayettevilleNorth Carolina 8.4
- 93HendersonvilleTennessee 8.4
- 93Fort WorthTexas 8.4
- 93Chula VistaCalifornia 8.4
- 93Inglewoodlow-cost sensorsCalifornia 8.4
- 100Winter ParkFlorida 8.3
- 100SavannahGeorgia 8.3
- 100GulfportMississippi 8.3
- 100KnoxvilleTennessee 8.3
- 100SaginawTexas 8.3
- 100TexarkanaTexas 8.3
- 100La Crescenta-Montroselow-cost sensorsCalifornia 8.3
- 107LakelandFlorida 8.2
- 107HattiesburgMississippi 8.2
- 107HickoryNorth Carolina 8.2
- 107RaleighNorth Carolina 8.2
- 107Jurupa ValleyCalifornia 8.2
- 112Coconut CreekFlorida 8.1
- 112ValricoFlorida 8.1
- 112ClemmonsNorth Carolina 8.1
- 112MaryvilleTennessee 8.1
- 112San DiegoCalifornia 8.1
- 112VisaliaCalifornia 8.1
- 118TopekaKansas 8.0
- 118ChalmetteLouisiana 8.0
- 118SulphurLouisiana 8.0
- 118Winston-SalemNorth Carolina 8.0
- 118FresnoCalifornia 8.0
- 118HobbsNew Mexico 8.0
- 124KennerLouisiana 7.9
- 124CharlotteNorth Carolina 7.9
- 124PhiladelphiaPennsylvania 7.9
- 124Arroyo GrandeCalifornia 7.9
- 124BakersfieldCalifornia 7.9
- 124Simi ValleyCalifornia 7.9
- 130West MemphisArkansas 7.8
- 130JacksonMississippi 7.8
- 130WyomingMichigan 7.8
- 130Torrancelow-cost sensorsCalifornia 7.8
- 134JacksonvilleFlorida 7.7
- 134PascagoulaMississippi 7.7
- 134McAlesterOklahoma 7.7
- 134La PorteTexas 7.7
- 134RedfordMichigan 7.7
- 134CorcoranCalifornia 7.7
- 134Santa Monicalow-cost sensorsCalifornia 7.7
- 134OdessaTexas 7.7
- 142DecaturAlabama 7.6
- 142North CharlestonSouth Carolina 7.6
- 142NashvilleTennessee 7.6
- 142HollandMichigan 7.6
- 142EwingNew Jersey 7.6
- 142LebanonPennsylvania 7.6
- 142San JoseCalifornia 7.6
- 149SarasotaFlorida 7.5
- 149St. LouisMissouri 7.5
- 149StocktonCalifornia 7.5
- 152DavieFlorida 7.4
- 152Deerfield BeachFlorida 7.4
- 152TampaFlorida 7.4
- 152BrunswickGeorgia 7.4
- 152HarrisburgPennsylvania 7.4
- 152Agouralow-cost sensorsCalifornia 7.4
- 152UkiahCalifornia 7.4
- 159Granite CityIllinois 7.3
- 159Roanoke RapidsNorth Carolina 7.3
- 159ColumbusOhio 7.3
- 159West MifflinPennsylvania 7.3
- 159CalexicoCalifornia 7.3
- 159El CajonCalifornia 7.3
- 165JeffersonvilleIndiana 7.2
- 165Columbialow-cost sensorsMissouri 7.2
- 165ColumbiaTennessee 7.2
- 165ClovisCalifornia 7.2
- 165Great FallsMontana 7.2
- 165HelenaMontana 7.2
- 171HuntsvilleAlabama 7.1
- 171HomesteadFlorida 7.1
- 171IndianapolisIndiana 7.1
- 171MiddletownOhio 7.1
- 171CharlestonWest Virginia 7.1
- 171Lomitalow-cost sensorsCalifornia 7.1
- 171TurlockCalifornia 7.1
- 178Daytona BeachFlorida 7.0
- 178Delray BeachFlorida 7.0
- 178Ferry PassFlorida 7.0
- 178EvansvilleIndiana 7.0
- 178JasperIndiana 7.0
- 178Kansas CityKansas 7.0
- 178ClevelandOhio 7.0
- 178GlendoraCalifornia 7.0
- 178OaklandCalifornia 7.0
- 187East Saint LouisIllinois 6.9
- 187PortsmouthOhio 6.9
- 187LawtonOklahoma 6.9
- 187BanningCalifornia 6.9
- 187Long BeachCalifornia 6.9
- 187NipomoCalifornia 6.9
- 193NewarkDelaware 6.8
- 193WellingtonFlorida 6.8
- 193Terre HauteIndiana 6.8
- 193PennsaukenNew Jersey 6.8
- 193AshburnVirginia 6.8
- 193YumaArizona 6.8
- 199New OrleansLouisiana 6.7
- 199Kansas CityMissouri 6.7
- 199HernandoMississippi 6.7
- 199NorwoodOhio 6.7
- 199RichmondVirginia 6.7
- 199East ChicagoIndiana 6.7
- 199WheelingWest Virginia 6.7
- 206Fruit CoveFlorida 6.6
- 206GainesvilleFlorida 6.6
- 206White OakOhio 6.6
- 206YorkPennsylvania 6.6
- 206CookevilleTennessee 6.6
- 206Oak LawnIllinois 6.6
- 206DearbornMichigan 6.6
- 206ElizabethNew Jersey 6.6
- 206LindenNew Jersey 6.6
- 206LancasterPennsylvania 6.6
- 206Casa GrandeArizona 6.6
- 217Saint JosephMissouri 6.5
- 217CharlottesvilleVirginia 6.5
- 217Lincoln ParkMichigan 6.5
- 217New York CityNew York 6.5
- 217OregonOhio 6.5
- 217WestervilleOhio 6.5
- 217HollisterCalifornia 6.5
- 217ModestoCalifornia 6.5
- 217San LeandroCalifornia 6.5
- 226LouisvilleKentucky 6.4
- 226Valley StationKentucky 6.4
- 226CincinnatiOhio 6.4
- 226LebanonOhio 6.4
- 226AdaOklahoma 6.4
- 226ClarksvilleTennessee 6.4
- 226CantonOhio 6.4
- 226NogalesArizona 6.4
- 226El CentroCalifornia 6.4
- 235Palm CityFlorida 6.3
- 235AshevilleNorth Carolina 6.3
- 235ChesapeakeVirginia 6.3
- 235East HamptonVirginia 6.3
- 235SteubenvilleOhio 6.3
- 235OceansideCalifornia 6.3
- 235RexburgIdaho 6.3
- 242FairhopeAlabama 6.2
- 242Safety HarborFlorida 6.2
- 242ElizabethtownKentucky 6.2
- 242GreenvilleNorth Carolina 6.2
- 242Toms RiverNew Jersey 6.2
- 242SpringfieldOhio 6.2
- 242ChesterPennsylvania 6.2
- 242DyersburgTennessee 6.2
- 242KingsportTennessee 6.2
- 242GalvestonTexas 6.2
- 242HopewellVirginia 6.2
- 242BellevueNebraska 6.2
- 242ToledoOhio 6.2
- 242ReadingPennsylvania 6.2
- 242PowayCalifornia 6.2
- 242Santa BarbaraCalifornia 6.2
- 258WestonFlorida 6.1
- 258New AlbanyIndiana 6.1
- 258OlatheKansas 6.1
- 258AshlandKentucky 6.1
- 258JeffersontownKentucky 6.1
- 258ChicagoIllinois 6.1
- 258NapervilleIllinois 6.1
- 258CarlislePennsylvania 6.1
- 258PhoenixArizona 6.1
- 258BrawleyCalifornia 6.1
- 268WilmingtonDelaware 6.0
- 268Palm BayFlorida 6.0
- 268BaltimoreMaryland 6.0
- 268DaytonOhio 6.0
- 268JacksonTennessee 6.0
- 268HarrisonburgVirginia 6.0
- 268RoanokeVirginia 6.0
- 268HuntingtonWest Virginia 6.0
- 268DetroitMichigan 6.0
- 268PatersonNew Jersey 6.0
- 268MaderaCalifornia 6.0
- 268VictorvilleCalifornia 6.0
- 268Columbia CityWashington 6.0
- 281PaducahKentucky 5.9
- 281SewellNew Jersey 5.9
- 281Rose HillVirginia 5.9
- 281SpringfieldVirginia 5.9
- 281Jersey CityNew Jersey 5.9
- 281NorristownPennsylvania 5.9
- 287BrookfieldIllinois 5.8
- 287Calumet CityIllinois 5.8
- 287Fort WayneIndiana 5.8
- 287MuncieIndiana 5.8
- 287KalamazooMichigan 5.8
- 287Fort LeeNew Jersey 5.8
- 287WarrenOhio 5.8
- 287AllentownPennsylvania 5.8
- 287BethlehemPennsylvania 5.8
- 287WilkinsburgPennsylvania 5.8
- 287WatertownSouth Dakota 5.8
- 287LincolnCalifornia 5.8
- 287RentonWashington 5.8
- 300WashingtonDistrict of Columbia 5.7
- 300Lexington-FayetteKentucky 5.7
- 300AnkenyIowa 5.7
- 300WaterlooIowa 5.7
- 300EastpointeMichigan 5.7
- 300TrentonNew Jersey 5.7
- 300DublinOhio 5.7
- 300PerrysburgOhio 5.7
- 300SalinasCalifornia 5.7
- 300San FranciscoCalifornia 5.7
- 300Santa CruzCalifornia 5.7
- 311FishersIndiana 5.6
- 311Saint MatthewsKentucky 5.6
- 311Franklin ParkIllinois 5.6
- 311HammondIndiana 5.6
- 311KokomoIndiana 5.6
- 311MantecaCalifornia 5.6
- 317ScaggsvilleMaryland 5.5
- 317SpringfieldMissouri 5.5
- 317Atlantic CityNew Jersey 5.5
- 317PleasantvilleNew Jersey 5.5
- 317JolietIllinois 5.5
- 317GaryIndiana 5.5
- 317LafayetteIndiana 5.5
- 317YoungstownOhio 5.5
- 317McKeesportPennsylvania 5.5
- 317WeirtonWest Virginia 5.5
- 327BearDelaware 5.4
- 327ColumbusIndiana 5.4
- 327ElktonMaryland 5.4
- 327MuscatineIowa 5.4
- 327AndersonIndiana 5.4
- 327Bay CityMichigan 5.4
- 327Port HuronMichigan 5.4
- 327AkronOhio 5.4
- 327San Luis ObispoCalifornia 5.4
- 327Yuba CityCalifornia 5.4
- 327Dodge CityKansas 5.4
- 327AmarilloTexas 5.4
- 327MillcreekUtah 5.4
- 340University CityMissouri 5.3
- 340ClintonIowa 5.3
- 340Iowa CityIowa 5.3
- 340RockfordIllinois 5.3
- 340Grand RapidsMichigan 5.3
- 340MedinaOhio 5.3
- 340JohnstownPennsylvania 5.3
- 340PittsburghPennsylvania 5.3
- 340State CollegePennsylvania 5.3
- 340FillmoreCalifornia 5.3
- 340LompocCalifornia 5.3
- 340Thousand OaksCalifornia 5.3
- 340Arden-ArcadeCalifornia 5.3
- 353Fort ThomasKentucky 5.2
- 353ArnoldMissouri 5.2
- 353LemayMissouri 5.2
- 353DavenportIowa 5.2
- 353BuffaloNew York 5.2
- 353LimaOhio 5.2
- 353Weirton HeightsWest Virginia 5.2
- 353RosevilleCalifornia 5.2
- 353SacramentoCalifornia 5.2
- 353Rapid CitySouth Dakota 5.2
- 353BadgerAlaska 5.2
- 353Oxon Hill-GlassmanorMaryland 5.2
- 365DoverDelaware 5.1
- 365DecaturIllinois 5.1
- 365BloomingtonIndiana 5.1
- 365ShakopeeMinnesota 5.1
- 365OmahaNebraska 5.1
- 365MadisonWisconsin 5.1
- 365MilwaukeeWisconsin 5.1
- 365MesaArizona 5.1
- 365TempeArizona 5.1
- 365FolsomCalifornia 5.1
- 365Lake ElsinoreCalifornia 5.1
- 365San RafaelCalifornia 5.1
- 365LewistonIdaho 5.1
- 365SeattleWashington 5.1
- 365KahuluiHawaii 5.1
- 380RaymoreMissouri 5.0
- 380New HavenConnecticut 5.0
- 380ChampaignIllinois 5.0
- 380PortageIndiana 5.0
- 380South BendIndiana 5.0
- 380TaylorMichigan 5.0
- 380HonoluluHawaii 5.0
- 380Makakilo / Kapolei / Honokai HaleHawaii 5.0
- 388Upper AltonIllinois 4.9
- 388Hunt ValleyMaryland 4.9
- 388Cleveland HeightsOhio 4.9
- 388New BrunswickNew Jersey 4.9
- 388RochesterNew York 4.9
- 388Shaker HeightsOhio 4.9
- 388BridgeportConnecticut 4.9
- 388Casas AdobesArizona 4.9
- 388MaranaArizona 4.9
- 388LancasterCalifornia 4.9
- 388CondaIdaho 4.9
- 388RandolphNew Jersey 4.9
- 400NorthbrookIllinois 4.8
- 400PeoriaIllinois 4.8
- 400HolbrookNew York 4.8
- 400HermitagePennsylvania 4.8
- 400WaukeshaWisconsin 4.8
- 400GlendaleArizona 4.8
- 400MercedCalifornia 4.8
- 400OrcuttCalifornia 4.8
- 400Redwood CityCalifornia 4.8
- 400ThorntonColorado 4.8
- 400ButteMontana 4.8
- 411SpringfieldIllinois 4.7
- 411DanburyConnecticut 4.7
- 411New LondonConnecticut 4.7
- 411JenisonMichigan 4.7
- 411YpsilantiMichigan 4.7
- 411PainesvilleOhio 4.7
- 411South MilwaukeeWisconsin 4.7
- 411Las CrucesNew Mexico 4.7
- 411Las VegasNevada 4.7
- 411GreshamOregon 4.7
- 411West JordanUtah 4.7
- 422Des PlainesIllinois 4.6
- 422ElkhartIndiana 4.6
- 422BostonMassachusetts 4.6
- 422AugustaMaine 4.6
- 422LansingMichigan 4.6
- 422BurnsvilleMinnesota 4.6
- 422AlbanyNew York 4.6
- 422EriePennsylvania 4.6
- 422TucsonArizona 4.6
- 422AlbuquerqueNew Mexico 4.6
- 422LubbockTexas 4.6
- 422LongmontColorado 4.6
- 422NampaIdaho 4.6
- 422HighlandUtah 4.6
- 422OremUtah 4.6
- 422CheyenneWyoming 4.6
- 438EdgewoodMaryland 4.5
- 438BloomingtonIllinois 4.5
- 438MolineIllinois 4.5
- 438FlintMichigan 4.5
- 438MinneapolisMinnesota 4.5
- 438KenmoreNew York 4.5
- 438TracyCalifornia 4.5
- 438DenverColorado 4.5
- 438Rio RanchoNew Mexico 4.5
- 438RenoNevada 4.5
- 438Fort CollinsColorado 4.5
- 438Salt Lake CityUtah 4.5
- 438Spanish ForkUtah 4.5
- 438BellinghamWashington 4.5
- 452HartfordConnecticut 4.4
- 452Des MoinesIowa 4.4
- 452SpringfieldMassachusetts 4.4
- 452Saint PaulMinnesota 4.4
- 452GahannaOhio 4.4
- 452AltoonaPennsylvania 4.4
- 452GaltCalifornia 4.4
- 452BillingsMontana 4.4
- 452MilwaukieOregon 4.4
- 452TacomaWashington 4.4
- 452GilletteWyoming 4.4
- 463HagerstownMaryland 4.3
- 463LibertyMissouri 4.3
- 463WaterburyConnecticut 4.3
- 463CaryIllinois 4.3
- 463ZionIllinois 4.3
- 463RochesterMinnesota 4.3
- 463RutlandVermont 4.3
- 463WoodlandCalifornia 4.3
- 471BayonneNew Jersey 4.2
- 471NewburghNew York 4.2
- 471ParadiseCalifornia 4.2
- 471Colorado SpringsColorado 4.2
- 471RedmondOregon 4.2
- 471ParklandWashington 4.2
- 471Port AngelesWashington 4.2
- 471FairbanksAlaska 4.2
- 479BrocktonMassachusetts 4.1
- 479Fall RiverMassachusetts 4.1
- 479Saint CloudMinnesota 4.1
- 479GreeleyColorado 4.1
- 479BozemanMontana 4.1
- 479BountifulUtah 4.1
- 479MagnaUtah 4.1
- 479West Valley CityUtah 4.1
- 479SunnysideWashington 4.1
- 488PortlandMaine 4.0
- 488Apple ValleyMinnesota 4.0
- 488BlaineMinnesota 4.0
- 488Saint MichaelMinnesota 4.0
- 488West FargoNorth Dakota 4.0
- 488LincolnNebraska 4.0
- 488PortsmouthNew Hampshire 4.0
- 488ProvidenceRhode Island 4.0
- 488Eau ClaireWisconsin 4.0
- 488TruckeeCalifornia 4.0
- 488PuebloColorado 4.0
- 488ReddingCalifornia 4.0
- 488AltamontOregon 4.0
- 488MedfordOregon 4.0
- 488HerrimanUtah 4.0
- 488AuburnWashington 4.0
- 504LowellMassachusetts 3.9
- 504QuincyMassachusetts 3.9
- 504WorcesterMassachusetts 3.9
- 504Green BayWisconsin 3.9
- 504EugeneOregon 3.9
- 509RockvilleMaryland 3.8
- 509GreenfieldMassachusetts 3.8
- 509LynnMassachusetts 3.8
- 509New CityNew York 3.8
- 509SyracuseNew York 3.8
- 509White PlainsNew York 3.8
- 509AppletonWisconsin 3.8
- 509TigardOregon 3.8
- 517MasonOhio 3.7
- 517KeeneNew Hampshire 3.7
- 517UticaNew York 3.7
- 517Spring ValleyNevada 3.7
- 517BismarckNorth Dakota 3.7
- 517YakimaWashington 3.7
- 517KīheiHawaii 3.7
- 517AnchorageAlaska 3.7
- 525PittsfieldMassachusetts 3.6
- 525Carson CityNevada 3.6
- 525Idaho FallsIdaho 3.6
- 525RoseburgOregon 3.6
- 525CentraliaWashington 3.6
- 525LaceyWashington 3.6
- 525Salmon CreekWashington 3.6
- 525WenatcheeWashington 3.6
- 525HiloHawaii 3.6
- 534ChicoCalifornia 3.5
- 534Spanish SpringsNevada 3.5
- 536North ChicopeeMassachusetts 3.4
- 536BrookingsSouth Dakota 3.4
- 536BoiseIdaho 3.4
- 536North OgdenUtah 3.4
- 536Moses LakeWashington 3.4
- 536ShorelineWashington 3.4
- 536Rock SpringsWyoming 3.4
- 543PawtucketRhode Island 3.3
- 543SuperiorWisconsin 3.3
- 543Ken CarylColorado 3.3
- 543HendersonNevada 3.3
- 543Cedar CityUtah 3.3
- 543Apache JunctionArizona 3.3
- 543Coeur d'AleneIdaho 3.3
- 543MoscowIdaho 3.3
- 543CanbyOregon 3.3
- 543HermistonOregon 3.3
- 543SalemOregon 3.3
- 543WoodburnOregon 3.3
- 543LongviewWashington 3.3
- 556AtascaderoCalifornia 3.2
- 556VacavilleCalifornia 3.2
- 556Coos BayOregon 3.2
- 556VancouverWashington 3.2
- 556CasperWyoming 3.2
- 561LewistonMaine 3.1
- 561DerryNew Hampshire 3.1
- 561AberdeenSouth Dakota 3.1
- 561DavisCalifornia 3.1
- 561Grand JunctionColorado 3.1
- 561EnterpriseNevada 3.1
- 561MeridianIdaho 3.1
- 561BendOregon 3.1
- 561Grants PassOregon 3.1
- 561HillsboroOregon 3.1
- 561PortlandOregon 3.1
- 561TooeleUtah 3.1
- 561Summerlin SouthNevada 3.1
- 574DuluthMinnesota 3.0
- 574AlbanyOregon 3.0
- 574AshlandOregon 3.0
- 574The DallesOregon 3.0
- 574BremertonWashington 3.0
- 574Mount VernonWashington 3.0
- 574SpokaneWashington 3.0
- 581Green ValleyArizona 2.9
- 581MissoulaMontana 2.9
- 583HurricaneUtah 2.8
- 583PendletonOregon 2.8
- 583LaramieWyoming 2.8
- 586LaconiaNew Hampshire 2.7
- 586Boulder CityNevada 2.7
- 586MesquiteNevada 2.7
- 586BeavertonOregon 2.7
- 586AberdeenWashington 2.7
- 591Sioux FallsSouth Dakota 2.6
- 591PocatelloIdaho 2.6
- 591Twin FallsIdaho 2.6
- 594South LaurelMaryland 2.5
- 595DallasOregon 2.4
- 595Forest GroveOregon 2.4
- 595PascoWashington 2.4
- 595Walla WallaWashington 2.4
- 599AnacortesWashington 2.3
- 600CorvallisOregon 2.2
- 600McMinnvilleOregon 2.2
- 600PullmanWashington 2.2
- 603Oak HarborWashington 2.1
- 604CoventryRhode Island 2.0
- 605Tri-CitiesWashington 1.9
- 606EllensburgWashington 1.6
- 606OrchardsWashington 1.6
- 608Spokane ValleyWashington 1.5
- 609BellevueWashington 1.2
- 609IssaquahWashington 1.2
- 611MarysvilleWashington 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+