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Air quality in California
Air quality index (AQI) and PM2.5 air pollution in California
LIVE AQI CITY RANKING
Real-time California
Most polluted city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Florin | 87 |
| 2 | Oceano | 86 |
| 3 | Lucerne Valley | 68 |
| 4 | Barstow | 64 |
| 5 | Baldwin Park | 63 |
| 6 | Imperial | 63 |
| 7 | Mecca | 63 |
| 8 | Sky Valley | 60 |
| 9 | El Segundo | 57 |
| 10 | Rosamond | 57 |
(local time)
SEE WORLD AQI RANKINGAIR QUALITY DATA CONTRIBUTORS
5331 Contributors
See all
LIVE AQI CITY RANKING
Real-time California
Cleanest city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Tahoe Vista | 0 |
| 2 | Capitola | 1 |
| 3 | Clearlake | 1 |
| 4 | Ferndale | 1 |
| 5 | Scotia | 1 |
| 6 | Kings Beach | 2 |
| 7 | North Lakeport | 2 |
| 8 | Olympic Valley | 2 |
| 9 | Bayside | 3 |
| 10 | Boonville | 3 |
(local time)
SEE WORLD AQI RANKING
3D animated air pollution map
Good
Moderate
Unhealthy for sensitive groups
Unhealthy
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The latest air quality news and resources.
California air quality data attribution
5331Contributors
- California Air Resources Board (CARB)
220 stations
- Spare the Air - Sacramento Region
12 stations
USA National Park Service23 stations
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El Dorado County Air Quality Management District11 stations
Palo Alto OES1 station
19 Government Contributors
Coalition for Clean Air (CCA)245 stations
- Safer Together San Francisco
1 station
4 Non-profit organization Contributors
- Oakland Unified School District
9 stations
- Coachella Valley Unified School District
9 stations
- El Centro Elementary School District
2 stations
- Ackerman Charter School District
1 station
Ravenswood City School District IOT2 stations
- West Contra Costa Unified School District
3 stations
Harvard-Westlake School3 stations
- Calexico Unified School District
2 stations
- Livermore Valley Unified School District
1 station
- Plaza Community Services La Roca Verde
1 station
- Los Angeles Unified School District
1 station
- nora caruso
1 station
- Rialto Unified School District
1 station
- Sunset Co-op Nursery School
1 station
Grove Preschool2 stations
USC Environmental Health Centers1 station
16 Educational Contributors
Baldacci Family Vineyards1 station
Scribe Winery1 station
Forster Ranch1 station
IQAir Air Quality Science Team5 stations
- Stripe
1 station
5 Corporate Contributors
Pat Conway1 station
- Gustavo R. Guimarães
1 station
Aaron Solochek1 station
- GDH
1 station
- Steve
9 stations
- RSM1
1 station
- Timothy Wilson
1 station
- -
1 station
- ddavies0001
2 stations
- IQAir community Member
1 station
- Nathan Pyle, MA
1 station
- justin bright
1 station
Hunter1 station
- Chuck Kissner
1 station
- Chris
1 station
- Alejandra Perez
1 station
- CK
1 station
- chris
1 station
- Ben
1 station
- Brent
1 station
- JT
1 station
- IQAir Community Member
1 station
- Charlie Leonard
1 station
- AC
1 station
Camille1 station
Nick Chapman1 station
- IQAir Community Member
1 station
- Jeremy
1 station
KellerG1 station
- IQAir Community Member
1 station
- Anonymous
1 station
janet fouts1 station
- dra
1 station
- Phong Nguyen
1 station
- WH57
1 station
- kevin
1 station
- Igor Solomennikov
1 station
- Anonymous
2 stations
- Mat Henley
1 station
BS2 stations
- tripleD
1 station
- IQAir PDR Member
1 station
- Dan P
1 station
- Travis Thompson
1 station
Lane@IQAir1 station
- Chandler Dunlap - Dutch Bros
2 stations
- Anonymous
1 station
- IQAir Community Member
1 station
- Jen & Jason Van Dinter
1 station
- Robert M
1 station
- A & O Aryal
1 station
Daniel Rich1 station
treemocker1 station
Mario Zaizar1 station
Friendly Neighbor1 station
- FlyGirl
1 station
- Lars
1 station
Hippopo1 station
- Hogwarts
1 station
- Stephen Schlie
1 station
- Shawn
1 station
- Brian Morton
1 station
- efeff
1 station
- Brian Goshorn
1 station
- Spongebob Airpants
1 station
- Anonymous
1 station
- Matt
1 station
- William
1 station
- A.Kuehlmann
1 station
ChemistChristi1 station
- Leslie Barnes
1 station
- Hugh Wimberly
1 station
Upavas1 station
- Max C
1 station
HGR barn1 station
anonymous1 station
Jim Minton1 station
- Ben
1 station
- JMA
1 station
- anonymoose
1 station
Jim Cornick1 station
- Michael Nielsen
1 station
- C.L.
1 station
Will Mason2 stations
- Meinrat Andreae
1 station
- nontexan
1 station
- Simon Walker
1 station
Anonymous1 station
chubert1 station
- Randy Steen
1 station
- Lorien
1 station
- Karl8704
1 station
- Wim Coekaerts
1 station
Darell1 station
AL1 station
Red Dog Ranch1 station
- Adam
1 station
- Jonathan Sorenson
1 station
- Mark Legassie
1 station
- Anonymous
1 station
- Michi Watchdog
1 station
- EJ
1 station
- Nicklas Johnson
1 station
- John Grossman
1 station
- KKastle IQ
1 station
- Erina Love
1 station
- Margot
1 station
- FamilyD
1 station
JGM1 station
Pacific View Air1 station
- GB
1 station
- Sasha
1 station
JC1 station
- Wikinaut
1 station
- Matt Newkirk
1 station
- russ
1 station
- msuttie
1 station
- rkjunior
1 station
J1 station
- Erik Bjorling
1 station
- Quail Mountain Lane
1 station
- Logan Bruns
1 station
- rbernabe
1 station
- KBT
1 station
- mjburns
1 station
- Anonymous
1 station
- quick.wood7910
1 station
- Patrick
1 station
- kelp
1 station
- GB
1 station
Neighborhood Brush Creek1 station
- IQAir Community Member
1 station
Brink1 station
Caspar1 station
Aaron Graf1 station
- Jack
1 station
- khowser10
1 station
- Integrity
1 station
- ucweather
1 station
Sanchez Way1 station
- Willow Glen - Sandra
1 station
- David
1 station
- variousplaces
1 station
- John Wright
1 station
- Robert Hawthorne
1 station
- Shrisha Radhakrishna
1 station
- Rana Rekhi
1 station
- Shearwater
1 station
- bearklaw
1 station
- Tom Bacus
1 station
- BJ
1 station
- eliotsensor
1 station
- Anonymous
1 station
- kpurvis
1 station
SP1 station
- David T
1 station
Rob Darby1 station
Tom Conrad1 station
- Chuck Tyler
1 station
- Chris Minick
1 station
- LHJB
1 station
- csm10495
1 station
- Steve Taubman
1 station
- Eric Sun
1 station
- Terrace 500
1 station
- Grid Man
1 station
- Gennady
1 station
- johnnygerman
1 station
michael price1 station
- Allen Hutchison
1 station
Stephen Franklin1 station
- E P
1 station
- alesl
1 station
- Jeff Kessler
1 station
- Jim Crawford
1 station
- JS
1 station
- Stan Watt
1 station
- David P. Balogh
1 station
178 Individual Contributors
5109 Anonymous contributors5109 stations
5109 Anonymous Contributors
13 Data sources
PurpleAir
Clarity Movement Co.- California Air Resources Board (CARB)
AirNow
IQAir- Spare the Air - Sacramento Region
- San Diego County Air Pollution Control District (SDAPCD)
Imperial County Department of Toxic Substance and Comite Civico del Valle- San Joaquin Valley Air Pollution Control District
- Imperial County Air Pollution Control District (ICAPCD)
- USA National Park Service
Santa Barbara County Air Pollution Control District
Bay Area Air Quality Management District (BAAQMD)
Which is the most polluted city in California?
- Florin 87
- Oceano 86
- Lucerne Valley 68
- Barstow 64
- Baldwin Park 63
- Imperial 63
- Mecca 63
- Sky Valley 60
- El Segundo 57
- Rosamond 57
- Victorville 57
- Koreatown 56
- Silver Lakes 56
- Apple Valley 55
- Twentynine Palms 54
- La Jolla 53
- Oak Hills 53
- Westmorland 53
- California City 49
- Chino 49
- El Cerrito Corona 49
- Hesperia 49
- Home Gardens 49
- Jurupa Valley 49
- Los Serranos 49
- Norco 49
- Placentia 49
- Villa Park 49
- Bass Lake 48
- Montclair 48
- Pedley 48
- Rowland Heights 48
- Rubidoux 48
- Sunnyslope 48
- Walnut 48
- Woodcrest 48
- Dinuba 47
- East La Mirada 47
- Garden Grove 47
- Grand Terrace 47
- Highgrove 47
- La Habra 47
- March Air Force Base 47
- North Hollywood 47
- San Dimas 47
- South San Jose Hills 47
- Stanton 47
- Artesia 46
- Avocado Heights 46
- Cerritos 46
- Charter Oak 46
- Covina 46
- Hawaiian Gardens 46
- La Palma 46
- La Puente 46
- Los Alamitos 46
- Mead Valley 46
- Muscoy 46
- San Antonio Heights 46
- Santa Fe Springs 46
- Shafter 46
- South El Monte 46
- South Whittier 46
- Valinda 46
- West Puente Valley 46
- West Whittier-Los Nietos 46
- Westminster 46
- Azusa 45
- Bell Gardens 45
- Bellflower 45
- Citrus 45
- Commerce 45
- Dirty Socks 45
- East Los Angeles 45
- Foothill Ranch 45
- Fort Irwin 45
- Irwindale 45
- Mayflower Village 45
- Midway City 45
- Montebello 45
- North El Monte 45
- Paramount 45
- Portola Hills 45
- Rossmoor 45
- South San Gabriel 45
- Temple City 45
- Vincent 45
- Bradbury 44
- East Pasadena 44
- East Rancho Dominguez 44
- East San Gabriel 44
- Florence-Graham 44
- Mentone 44
- Walnut Park 44
- Echo Park 43
- Fountain Valley 43
- Kern 43
- West Athens 43
- West Rancho Dominguez 43
- Westmont 43
- Alondra Park 42
- Del Aire 42
- Good Hope 42
- Hollywood 42
- La Mesa 42
- Ladera Heights 42
- Lawndale 42
- Lennox 42
- Shandon 42
- Yosemite Np Turtleback Dome 42
- Century City 41
- Glen Avon 41
- Laguna Hills 41
- Nuevo 41
- Ontario 41
- Reseda 41
- Rough and Ready 41
- Trona 41
- Yucca Valley 41
- Bermuda Dunes 40
- Cabazon 40
- Coto De Caza 40
- Desert Edge 40
- Garnet 40
- Indian Wells 40
- Meadowbrook 40
- Palos Verdes Estates 40
- Rancho Mirage 40
- Sherman Oaks 40
- Thousand Palms 40
- Yosemite Valley 40
- Big Bear City 39
- Oasis 39
- San Bernardino 39
- San Gabriel 39
- San Pedro 39
- South Gate 39
- Universal City 39
- Vista Santa Rosa 39
- Willowbrook 39
- Brawley 38
- Idyllwild 38
- Jamestown 38
- Maricopa 38
- Rancho Penasquitos 38
- Rolling Hills 38
- Romoland 38
- Boyle Heights 37
- Calipatria 37
- Canyon Lake 37
- Coronado 37
- Desert Shores 37
- El Cajon 37
- Green Acres 37
- Homeland 37
- Menifee 37
- Phelan 37
- Poway 37
- Quail Valley 37
- San Diego 37
- Sun City 37
- Sunland 37
- Valle Vista 37
- View Park-Windsor Hills 37
- Camp Pendleton South 36
- Canoga Park 36
- Carson 36
- East Hemet 36
- Lakeland Village 36
- Lakeside 36
- Lemon Grove 36
- West Covina 36
- Bloomington 35
- Joshua Tree 35
- Sedco Hills 35
- Wildomar 35
- Aliso Viejo 34
- Beaumont 34
- Casa de Oro-Mount Helix 34
- Chula Vista 34
- Imperial Beach 34
- La Presa 34
- Las Flores 34
- Mountain View Acres 34
- Murrieta Hot Springs 34
- National City 34
- Northridge 34
- Orcutt 34
- Rancho San Diego 34
- San Fernando 34
- Van Nuys 34
- Aguanga 33
- Alturas 33
- Bostonia 33
- Burney 33
- Colton 33
- Easton 33
- Gardena 33
- Granite Hills 33
- Hidden Hills 33
- Huntington Park 33
- Indio 33
- Jamul 33
- Lynwood 33
- Morro Bay 33
- North Hills 33
- Orange 33
- Pinon Hills 33
- Rialto 33
- Seeley 33
- Agoura 32
- Alhambra 32
- Crest 32
- Cypress 32
- Eucalyptus Hills 32
- Heber 32
- La Jolla Shores 32
- Lomita 32
- Maywood 32
- Mira Mesa 32
- Silver Lake 32
- Sorrento Valley 32
- Spring Valley Lake 32
- Winter Gardens 32
- Banning 31
- Encinitas 31
- Exeter 31
- Fairbanks Ranch 31
- Harbison Canyon 31
- Hemet 31
- Hidden Meadows 31
- Huron 31
- La Habra Heights 31
- Littlerock 31
- Mojave 31
- Palm Desert 31
- Rainbow 31
- San Jacinto 31
- Adelanto 30
- Bonsall 30
- Camp Pendleton North 30
- Julian 30
- June Lake 30
- Loma Linda 30
- Merced 30
- Rancho Santa Fe 30
- Riverside 30
- San Diego Country Estates 30
- San Pasqual 30
- Santee 30
- Bill Stanley 29
- Bonita 29
- Cathedral City 29
- Chino Hills 29
- Coachella 29
- Culver City 29
- Delano 29
- Guadalupe 29
- Hanford 29
- Hughson 29
- King City 29
- Los Angeles 29
- Rancho Palos Verdes 29
- Santa Susana 29
- South Pasadena 29
- Tuolumne City 29
- Visalia 29
- Vista 29
- Compton 28
- Del Mar 28
- Descanso 28
- Holtville 28
- Pine Valley 28
- Redwood Valley 28
- San Pablo 28
- Shasta Lake 28
- Fallbrook 27
- Fillmore 27
- Highland 27
- Palm Springs 27
- San Benito 27
- Venice 27
- Whittier 27
- Acton 26
- Agua Dulce 26
- Barstow Heights 26
- Beverly Hills 26
- Escalon 26
- Ladera Ranch 26
- Lake Arrowhead 26
- Lake Los Angeles 26
- Lancaster 26
- Monterey Park 26
- Moreno Valley 26
- Niland 26
- Rancho Santa Margarita 26
- Santa Ynez 26
- Sun Village 26
- Carlsbad 25
- Desert View Highlands 25
- Encino 25
- Lebec 25
- Lenwood 25
- Leona Valley 25
- Olancha 25
- Old Fig Garden 25
- Rio Vista 25
- San Andreas 25
- San Joaquin 25
- Tranquillity 25
- Winchester 25
- Arcadia 24
- Boron 24
- China Lake Acres 24
- Crestline 24
- Inyokern 24
- La Mirada 24
- Lompoc 24
- Marina del Rey 24
- Newhall 24
- Redondo Beach 24
- San Marino 24
- Studio City 24
- Vandenberg Village 24
- West Carson 24
- West Hollywood 24
- Atwater 23
- Blythe 23
- Buena Vista 23
- Carmichael 23
- Claremont 23
- Edwards Air Force Base 23
- Fullerton 23
- Glendale 23
- Hawthorne 23
- Lakeview 23
- Monrovia 23
- North Edwards 23
- Oceanside 23
- Pico Rivera 23
- Port Hueneme 23
- Portola 23
- Redlands 23
- Ridgecrest 23
- Santa Ana 23
- Shadow Hills 23
- Signal Hill 23
- Tujunga 23
- Westlake Village 23
- Yorba Linda 23
- Bell 22
- Broadmoor 22
- Buena Park 22
- Buttonwillow 22
- Campo 22
- Chatsworth 22
- Fontana 22
- Glendora 22
- Greenacres 22
- Lamont 22
- McFarland 22
- Newman 22
- North Tustin 22
- Piru 22
- Rosedale 22
- San Joaquin Hills 22
- Vandenberg Air Force Base 22
- Weedpatch 22
- Alpaugh 21
- Altadena 21
- Arvin 21
- Biggs 21
- Calexico 21
- Camarillo 21
- Colusa 21
- Corcoran 21
- Cutler 21
- Earlimart 21
- Ford City 21
- Freedom 21
- Hacienda Heights 21
- Keeler 21
- La Quinta 21
- Lathrop 21
- Lone Pine 21
- Lost Hills 21
- Madera 21
- Mission Hills 21
- Modesto 21
- Pixley 21
- Porterville 21
- Richgrove 21
- Searles Valley 21
- Sierra Madre 21
- Solano 21
- South Taft 21
- Stallion Springs 21
- Taft Heights 21
- Teviston 21
- Woodland Hills 21
- Bakersfield 20
- Callender 20
- Camino 20
- Castaic 20
- Cudahy 20
- East Porterville 20
- Frazier Park 20
- Grover Beach 20
- Inyo 20
- Isla Vista 20
- Kernville 20
- Kirkwood 20
- La Grange 20
- Laguna Niguel 20
- Long Beach 20
- Los Alamos 20
- Norwalk 20
- Paicines 20
- Palmdale 20
- Pasadena 20
- Pomona 20
- Poplar-Cotton Center 20
- Salton City 20
- San Clemente 20
- Santa Maria 20
- Sisquoc 20
- Solana Beach 20
- South Oroville 20
- Strathmore 20
- Summerland 20
- Tipton 20
- Val Verde 20
- Wasco 20
- Weldon 20
- West Hills 20
- Woodville 20
- Arroyo Grande 19
- Bishop 19
- Buckhorn 19
- Cambria 19
- Channel Islands Beach 19
- Corona 19
- Duarte 19
- El Centro 19
- El Rio 19
- Fresno 19
- Kelso 19
- Kerman 19
- Kettleman City 19
- Lake Isabella 19
- Linden 19
- Lindsay 19
- Mammoth Lakes 19
- Matheny 19
- Monterey 19
- Newport Beach 19
- Nipomo 19
- Patterson 19
- Pismo Beach 19
- Santa Clarita 19
- Saticoy 19
- Solvang 19
- Tehama 19
- Torrance 19
- Tustin 19
- Valencia 19
- Wofford Heights 19
- Alum Rock 18
- Avenal 18
- Bodfish 18
- Borrego Springs 18
- Camp Nelson 18
- Cayucos 18
- Chowchilla 18
- Corralitos 18
- Diamond Bar 18
- Farmersville 18
- Fruitridge Pocket 18
- Goleta 18
- Grass Valley 18
- Home Garden 18
- Irvine 18
- La Verne 18
- Laguna Beach 18
- Lemoore 18
- Meiners Oaks 18
- Mira Monte 18
- Mission Viejo 18
- Mountain House 18
- Oildale 18
- Orleans 18
- Prunedale 18
- Rancho Cordova 18
- Santa Monica 18
- Seal Beach 18
- Simi Valley 18
- Stratford 18
- Terra Bella 18
- Tulare 18
- Wheatland 18
- Willows 18
- Yucaipa 18
- Alta Sierra 17
- Armona 17
- Aromas 17
- Big Pine 17
- Blackhawk 17
- Campbell 17
- Citrus Heights 17
- Dana Point 17
- Davenport 17
- Desert Hot Springs 17
- Diamond Springs 17
- Fair Oaks 17
- Fairview 17
- Foresthill 17
- Golden Hills 17
- Goshen 17
- Inglewood 17
- Ivanhoe 17
- Kingsburg 17
- La Riviera 17
- La Selva Beach 17
- Lake Forest 17
- Laton 17
- Lemoore Station 17
- Lincoln 17
- Loma Rica 17
- London 17
- Loomis 17
- Los Olivos 17
- Manhattan Beach 17
- Mariposa 17
- Marysville 17
- Mesa Verde 17
- Miramonte 17
- Mono 17
- Montague 17
- Moorpark 17
- Morongo Valley 17
- Murphys 17
- Orosi 17
- Palo Cedro 17
- Patterson Tract 17
- Pine Grove 17
- Pine Mountain Club 17
- Plumas Lake 17
- Red Bluff 17
- Riverdale 17
- Roseville 17
- San Luis Obispo 17
- Santa Barbara 17
- Selma 17
- Stevenson Ranch 17
- Sunnyvale 17
- Toro Canyon 17
- Trabuco Canyon 17
- Tracy 17
- Turlock 17
- Twin Lakes 17
- West Menlo Park 17
- Woodlake 17
- Wrightwood 17
- Yuba City 17
- Alameda 16
- Arnold 16
- Auburn 16
- August 16
- Bethel Island 16
- Big Bear Lake 16
- Big River 16
- Biola 16
- Bonadelle Ranchos-Madera Ranchos 16
- Bret Harte 16
- Bystrom 16
- Caruthers 16
- Casa Conejo 16
- Caspar 16
- Colfax 16
- Country Club 16
- Del Rey 16
- Del Rio 16
- Delhi 16
- Denair 16
- Dos Palos 16
- Dublin 16
- East Palo Alto 16
- El Dorado Hills 16
- Elk Grove 16
- Empire 16
- Fairmead 16
- Firebaugh 16
- Fowler 16
- French Camp 16
- Garden Acres 16
- Georgetown 16
- Gilroy 16
- Green Valley 16
- Gustine 16
- Hayward 16
- Hermosa Beach 16
- Hilmar-Irwin 16
- Jackson 16
- Kennedy 16
- Keyes 16
- Knightsen 16
- La Canada Flintridge 16
- La Crescenta-Montrose 16
- Lake Nacimiento 16
- Lake San Marcos 16
- Lakewood 16
- Le Grand 16
- Lincoln Village 16
- Livingston 16
- Lompico 16
- Madera Acres 16
- Malibu 16
- Marina 16
- Mendota 16
- Minkler 16
- Morada 16
- Moss Beach 16
- Mount Hermon 16
- Mountain View 16
- Needles 16
- North Auburn 16
- Oak View 16
- Opal Cliffs 16
- Orange Cove 16
- Pacifica 16
- Parksdale 16
- Parkwood 16
- Pasatiempo 16
- Paso Robles 16
- Pioneer 16
- Placerville 16
- Planada 16
- Ramona 16
- Riverbank 16
- Riverdale Park 16
- Rocklin 16
- Rolling Hills Estates 16
- Salida 16
- San Leandro 16
- Santa Clara 16
- Seaside 16
- Shackelford 16
- South Dos Palos 16
- Squaw Valley 16
- Stanislaus 16
- Sunnyside 16
- Taft Mosswood 16
- Tarpey Village 16
- Thousand Oaks 16
- Topanga 16
- Valley Center 16
- Warner Springs 16
- Waterford 16
- West Modesto 16
- West Park 16
- Winton 16
- Alpine 15
- Antioch 15
- Aptos Hills-Larkin Valley 15
- Ashland 15
- Beale Air Force Base 15
- Blue Lake 15
- Brentwood 15
- Burlingame 15
- Cameron Park 15
- Carmel Valley Village 15
- Castroville 15
- Cherryland 15
- Clay 15
- Collierville 15
- Colma 15
- Cool 15
- Danville 15
- Day Valley 15
- Discovery Bay 15
- Dogtown 15
- Downey 15
- East Oakdale 15
- Felton 15
- Gold River 15
- Greenfield 15
- Herald 15
- Hollister 15
- Hume 15
- Huntington Beach 15
- Lake Elsinore 15
- Lee Vining 15
- Lockeford 15
- Lodi 15
- Los Banos 15
- Los Osos 15
- Marin City 15
- Meadow Vista 15
- Nevada County 15
- Oakley 15
- Oroville 15
- Paradise 15
- Parlier 15
- Redwood Shores 15
- Sacramento 15
- San Jose 15
- San Juan Bautista 15
- San Ramon 15
- Sanger 15
- Saranap 15
- Seacliff 15
- Sequoia National Park 15
- Shingle Springs 15
- Sonora 15
- Soquel 15
- South San Francisco 15
- Springville 15
- Sutter Creek 15
- Thornton 15
- Three Rivers 15
- Union City 15
- Upland 15
- Vine Hill 15
- Visitacion Valley 15
- Waldon 15
- Walnut Grove 15
- Woodland 15
- Agoura Hills 14
- Amador 14
- Amesti 14
- Anaheim 14
- Angels Camp 14
- Aptos 14
- Bonny Doon 14
- Boronda 14
- Buellton 14
- Byron 14
- Cambrian Park 14
- Carmel-by-the-Sea 14
- Castro Valley 14
- Cedar Ridge 14
- Cherry Valley 14
- Concord 14
- Cupertino 14
- Del Monte Forest 14
- Del Rey Oaks 14
- East Foothills 14
- East Sonora 14
- El Dorado 14
- Elkhorn 14
- Interlaken 14
- Ione 14
- Las Lomas 14
- Los Altos 14
- Los Altos Hills 14
- Los Gatos 14
- Manteca 14
- Middletown 14
- Monte Sereno 14
- Morgan Hill 14
- Mountain Ranch 14
- Murrieta 14
- Newark 14
- North Richmond 14
- Oxnard 14
- Pacific Grove 14
- Pajaro 14
- Palo Alto 14
- Parkway 14
- Pleasanton 14
- Pollock Pines 14
- Prather 14
- Rancho Cucamonga 14
- Rollingwood 14
- Rosemead 14
- Rosemont 14
- San Martin 14
- Santa Paula 14
- Seven Trees 14
- Soledad 14
- Soulsbyville 14
- Taft 14
- Tamalpais-Homestead Valley 14
- Tuolumne 14
- Valley Springs 14
- Vineyard 14
- West Bishop 14
- Alamo 13
- Avila Beach 13
- Bay Point 13
- Ben Lomond 13
- Bodega Bay 13
- Calaveras 13
- Carmel Valley 13
- Carpinteria 13
- Chualar 13
- Clovis 13
- Coalinga 13
- Contra Costa Centre 13
- Davis 13
- El Granada 13
- Eldridge 13
- Emeryville 13
- Folsom 13
- Foothill Farms 13
- Foster City 13
- Fremont 13
- Gonzales 13
- Graeagle 13
- Idyllwild-Pine Cove 13
- Lagunitas-Forest Knolls 13
- Los Molinos 13
- Mill Valley 13
- Milpitas 13
- Montalvin 13
- Nevada City 13
- North Highlands 13
- Orangevale 13
- Perris 13
- Placer 13
- Pleasant Hill 13
- Plymouth 13
- Rancho Calaveras 13
- Rancho Murieta 13
- Red Corral 13
- Redding 13
- Redwood City 13
- Ridgemark 13
- Rio Linda 13
- Ripon 13
- Running Springs 13
- Salinas 13
- San Francisco 13
- Santa Cruz 13
- Saratoga 13
- Sausalito 13
- Scotts Valley 13
- Sleepy Hollow 13
- Spring Valley 13
- Susanville 13
- Sutter 13
- Tara Hills 13
- Willits 13
- Ahwahnee 12
- Albany 12
- Anderson 12
- Antelope 12
- Anza 12
- Atascadero 12
- Atherton 12
- Belmont 12
- Belvedere 12
- Boulder Creek 12
- Bridgeport 12
- Brisbane 12
- Calabasas 12
- Columbia 12
- Copperopolis 12
- Crockett 12
- Daly City 12
- Deer Park 12
- Dixon Lane-Meadow Creek 12
- El Monte 12
- Elverta 12
- Escondido 12
- Esparto 12
- Fetters Hot Springs-Agua Caliente 12
- Forest Meadows 12
- Fort Jones 12
- Granite Bay 12
- Guerneville 12
- Hartley 12
- Hercules 12
- Highlands-Baywood Park 12
- Hillsborough 12
- Janesville 12
- Loyalton 12
- Loyola 12
- Menlo Park 12
- Midpines 12
- Millbrae 12
- Moraga 12
- Newcastle 12
- North Fair Oaks 12
- Oakdale 12
- Oakhurst 12
- Oakland 12
- Orland 12
- Penn Valley 12
- Phoenix Lake 12
- Pinole 12
- Pittsburg 12
- Portola Valley 12
- Ross 12
- San Carlos 12
- San Lorenzo 12
- San Mateo 12
- Shasta 12
- South Lake Tahoe 12
- Strawberry 12
- Sunnyside-Tahoe City 12
- Tehachapi 12
- Temecula 12
- Thermal 12
- Tiburon 12
- Truckee 12
- Watsonville 12
- Westwood 12
- Winters 12
- Yolo 12
- Yountville 12
- Yreka 12
- Yuba 12
- Angwin 11
- Arden-Arcade 11
- Berkeley 11
- Calistoga 11
- Carnelian Bay 11
- Chico 11
- Coarsegold 11
- Corning 11
- Corte Madera 11
- Cuyama 11
- Durham 11
- Hidden Valley Lake 11
- Johnstonville 11
- Kensington 11
- Kentfield 11
- Livermore 11
- Lucas Valley-Marinwood 11
- Martinez 11
- Noe Valley 11
- North Fork 11
- Novato 11
- Oak Park 11
- Richmond 11
- San Anselmo 11
- San Bruno 11
- San Rafael 11
- Santa Margarita 11
- Santa Venetia 11
- Shaver Lake 11
- Sheridan 11
- Shingletown 11
- Tamalpais Valley 11
- Tulelake 11
- Twain Harte 11
- Vacaville 11
- Ventura 11
- Walnut Creek 11
- Willow Creek 11
- Allendale 10
- American Canyon 10
- Auburn Lake Trails 10
- Avalon 10
- Benicia 10
- Bertsch-Oceanview 10
- Brea 10
- Brookdale 10
- Calimesa 10
- Challenge-Brownsville 10
- Dixon 10
- East Quincy 10
- Eastvale 10
- Fairfield 10
- Forestville 10
- Half Moon Bay 10
- Kelseyville 10
- Lafayette 10
- Lake of the Pines 10
- Lexington Hills 10
- Macdoel 10
- Montara 10
- Monte Rio 10
- Monument Hills 10
- Napa 10
- Nashville 10
- Orinda 10
- Piedmont 10
- Plumas 10
- Reedley 10
- Saint Helena 10
- Tahoe City 10
- Tahoma 10
- Templeton 10
- Ukiah 10
- Vallejo 10
- Weaverville 10
- Woodacre 10
- Woodbridge 10
- Woodside 10
- Bayview 9
- Boyes Hot Springs 9
- Camp Meeker 9
- Clayton 9
- Cobb 9
- El Sobrante 9
- El Verano 9
- Emerald Lake Hills 9
- Fairfax 9
- Gasquet 9
- Graton 9
- Healdsburg 9
- Humboldt Hill 9
- Kenwood 9
- Lake Wildwood 9
- Lakeport 9
- Laytonville 9
- Lewiston 9
- Linda 9
- Live Oak 9
- McCloud 9
- Mission District 9
- Mono Vista 9
- Montecito 9
- Ojai 9
- Olivehurst 9
- Pacheco 9
- Penngrove 9
- Petaluma 9
- Rancho Tehama Reserve 9
- Rodeo 9
- San Marcos 9
- Santa Rosa 9
- Sonoma 9
- South Yuba City 9
- Stanford 9
- Tierra Buena 9
- West Sacramento 9
- Windsor 9
- Berry Creek 8
- Cloverdale 8
- Costa Mesa 8
- Cottonwood 8
- Covelo 8
- Cutten 8
- Downieville 8
- Dunnigan 8
- Dunsmuir 8
- East Richmond Heights 8
- El Cerrito 8
- Greenville 8
- Gualala 8
- Hayfork 8
- Inverness 8
- Klamath 8
- Ladera 8
- Laguna Woods 8
- Larkspur 8
- Lower Lake 8
- Lucerne 8
- Myrtletown 8
- Occidental 8
- Oroville East 8
- Pine Hills 8
- Potter Valley 8
- Quincy 8
- Rio Del Mar 8
- Rohnert Park 8
- Sea Ranch 8
- Stockton 8
- Suisun 8
- Talmage 8
- Temelec 8
- Thermalito 8
- Williams 8
- Auberry 7
- Black Point-Green Point 7
- Bolinas 7
- Butte 7
- Chester 7
- Glenn 7
- Hornbrook 7
- Laguna 7
- Larkfield-Wikiup 7
- Magalia 7
- Marin 7
- Mission Canyon 7
- Rio Dell 7
- Roseland 7
- Sebastopol 7
- Yosemite Lakes 7
- Arbuckle 6
- Arcata 6
- Clear Lake Riviera 6
- Clearlake Oaks 6
- Cotati 6
- Diablo 6
- Dollar Point 6
- Eureka 6
- Forest Ranch 6
- Galt 6
- Humboldt 6
- Hydesville 6
- Lakehead-Lakeshore 6
- Maxwell 6
- McKinleyville 6
- Mendocino 6
- Quartz Hill 6
- Soda Bay 6
- Acalanes Ridge 5
- Bear Valley Springs 5
- Brooktrails 5
- Burbank 5
- Ceres 5
- Hamilton City 5
- Happy Camp 5
- Nice 5
- Palermo 5
- San Juan Capistrano 5
- Siskiyou 5
- Upper Lake 5
- Westhaven-Moonstone 5
- Wilton 5
- Bella Vista 4
- Central Valley (historical) 4
- Coleville 4
- Fort Bragg 4
- Fortuna 4
- Gerber 4
- Mount Shasta 4
- Redway 4
- Sierra 4
- Stonyford 4
- Trinity 4
- Weed 4
- Bayside 3
- Boonville 3
- Crescent City 3
- Gridley 3
- Hoopa 3
- Point Arena 3
- Kings Beach 2
- North Lakeport 2
- Olympic Valley 2
- Capitola 1
- Clearlake 1
- Ferndale 1
- San Miguel 1
- Scotia 1
- Tahoe Vista 0
AQI US, Metric