SmogRank / Countries / United States / California
Most polluted cities in California, United States
93 measured cities ranked by PM2.5, this year. Worst: Calexico at 21.6 µg/m³, #212 in the world.
| # | City | µg/m³ | |
|---|---|---|---|
| 1 | Calexico California | 21.6 | |
| 2 | Jurupa Valley California | 14.1 | |
| 3 | Riverside California | 12.6 | |
| 4 | Whittier California | 12.5 | |
| 5 | Tulare low-cost sensorsCalifornia | 12.3 | |
| 6 | Delano low-cost sensorsCalifornia | 12.2 | |
| 7 | Visalia California | 12.2 | |
| 8 | Bakersfield California | 11.9 | |
| 9 | Fontana California | 11.5 | |
| 10 | Corcoran California | 11.3 | |
| 11 | Los Angeles California | 11.2 | |
| 12 | Compton California | 11.1 | |
| 13 | Fresno California | 11.0 | |
| 14 | Hanford California | 10.7 | |
| 15 | South Lake Tahoe California | 10.6 | |
| 16 | Anaheim California | 10.1 | |
| 17 | Porterville California | 9.9 | |
| 18 | Clovis California | 9.7 | |
| 19 | Inglewood low-cost sensorsCalifornia | 9.7 | |
| 20 | San Diego California | 9.6 | |
| 21 | Long Beach California | 9.4 | |
| 22 | Madera California | 9.4 | |
| 23 | Burbank California | 9.3 | |
| 24 | Glendora California | 9.3 | |
| 25 | Merced California | 9.2 | |
| 26 | Chula Vista California | 8.9 | |
| 27 | Mission Viejo California | 8.9 | |
| 28 | Santa Monica low-cost sensorsCalifornia | 8.8 | |
| 29 | Lake Elsinore California | 8.7 | |
| 30 | Richmond California | 8.7 | |
| 31 | El Cajon California | 8.6 | |
| 32 | Oceanside California | 8.6 | |
| 33 | Huntington Beach low-cost sensorsCalifornia | 8.4 | |
| 34 | Pasadena low-cost sensorsCalifornia | 8.4 | |
| 35 | Torrance low-cost sensorsCalifornia | 8.4 | |
| 36 | Santa Clarita California | 8.3 | |
| 37 | San Jose California | 8.2 | |
| 38 | Turlock California | 8.2 | |
| 39 | San Luis Obispo California | 8.1 | |
| 40 | Manteca California | 8.0 | |
| 41 | Modesto California | 8.0 | |
| 42 | Poway California | 8.0 | |
| 43 | Stockton California | 8.0 | |
| 44 | Oakland California | 7.9 | |
| 45 | Victorville California | 7.8 | |
| 46 | Woodland California | 7.7 | |
| 47 | Simi Valley California | 7.6 | |
| 48 | Yuba City California | 7.6 | |
| 49 | San Francisco California | 7.5 | |
| 50 | Indio California | 7.4 | |
| 51 | San Leandro California | 7.3 | |
| 52 | Arden-Arcade California | 7.3 | |
| 53 | Salinas California | 7.2 | |
| 54 | Berkeley California | 7.1 | |
| 55 | Nipomo California | 7.0 | |
| 56 | Arroyo Grande California | 6.9 | |
| 57 | Davis California | 6.9 | |
| 58 | Roseville California | 6.9 | |
| 59 | Vallejo California | 6.9 | |
| 60 | Brawley California | 6.8 | |
| 61 | El Centro California | 6.8 | |
| 62 | Livermore California | 6.8 | |
| 63 | Sacramento California | 6.8 | |
| 64 | Banning California | 6.7 | |
| 65 | Fillmore California | 6.5 | |
| 66 | Galt California | 6.5 | |
| 67 | Lincoln California | 6.5 | |
| 68 | Santa Cruz California | 6.5 | |
| 69 | Temecula California | 6.4 | |
| 70 | Orcutt California | 6.2 | |
| 71 | Oxnard California | 6.1 | |
| 72 | Redwood City California | 6.1 | |
| 73 | Ukiah California | 6.1 | |
| 74 | Atascadero California | 6.0 | |
| 75 | Gilroy California | 5.9 | |
| 76 | Santa Rosa California | 5.8 | |
| 77 | Thousand Oaks California | 5.8 | |
| 78 | Redding California | 5.8 | |
| 79 | Chico California | 5.6 | |
| 80 | Concord California | 5.6 | |
| 81 | Tracy California | 5.3 | |
| 82 | Lancaster California | 5.1 | |
| 83 | San Rafael California | 5.1 | |
| 84 | Paradise California | 4.9 | |
| 85 | Folsom California | 4.8 | |
| 86 | Ridgecrest California | 4.8 | |
| 87 | Truckee California | 4.8 | |
| 88 | Vacaville California | 4.8 | |
| 89 | Hollister California | 4.7 | |
| 90 | Encinitas low-cost sensorsCalifornia | 4.3 | |
| 91 | Palo Alto low-cost sensorsCalifornia | 4.3 | |
| 92 | Goleta low-cost sensorsCalifornia | 4.1 | |
| 93 | Lompoc California | 3.4 |
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data
Estimated: cities without a monitor
California cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Santa Ana estimated | ≈ 8 µg/m³ |
| Irvine estimated | ≈ 8 µg/m³ |
| Fremont estimated | ≈ 9 µg/m³ |
| San Bernardino estimated | ≈ 9 µg/m³ |
| Moreno Valley estimated | ≈ 9 µg/m³ |
| Glendale estimated | ≈ 12 µg/m³ |
| Garden Grove estimated | ≈ 8 µg/m³ |
| Rancho Cucamonga estimated | ≈ 12 µg/m³ |
| Corona estimated | ≈ 11 µg/m³ |
| Palmdale estimated | ≈ 6 µg/m³ |
| Hayward estimated | ≈ 10 µg/m³ |
| Sunnyvale estimated | ≈ 9 µg/m³ |
| Pomona estimated | ≈ 10 µg/m³ |
| Escondido estimated | ≈ 11 µg/m³ |
| Valencia estimated | ≈ 7 µg/m³ |
| Orange estimated | ≈ 8 µg/m³ |
| Fullerton estimated | ≈ 12 µg/m³ |
| East Los Angeles estimated | ≈ 11 µg/m³ |
| Santa Clara estimated | ≈ 9 µg/m³ |
| El Monte estimated | ≈ 11 µg/m³ |
| Carlsbad estimated | ≈ 11 µg/m³ |
| Downey estimated | ≈ 11 µg/m³ |
| Costa Mesa estimated | ≈ 8 µg/m³ |
| Fairfield estimated | ≈ 6 µg/m³ |
| Antioch estimated | ≈ 9 µg/m³ |
| Murrieta estimated | ≈ 10 µg/m³ |
| West Covina estimated | ≈ 12 µg/m³ |
| Norwalk estimated | ≈ 12 µg/m³ |
| Daly City estimated | ≈ 7 µg/m³ |
| Santa Maria estimated | ≈ 8 µg/m³ |
| San Mateo estimated | ≈ 7 µg/m³ |
| Rialto estimated | ≈ 9 µg/m³ |
| Vista estimated | ≈ 11 µg/m³ |
| Ventura estimated | ≈ 6 µg/m³ |
| South Gate estimated | ≈ 12 µg/m³ |
| Hesperia estimated | ≈ 5 µg/m³ |
| San Marcos estimated | ≈ 11 µg/m³ |
| Westminster estimated | ≈ 8 µg/m³ |
| Santa Barbara estimated | ≈ 5 µg/m³ |
| Menifee estimated | ≈ 10 µg/m³ |
Updated 2026-10-01 07:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.