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Worst Air Quality ZIP Codes in California
Top 50 worst air quality zip codes in america in California. ZIP-level data from EPA Air Quality Index.
Top 50
| # | ZIP Code | City / Suburb | Median AQI |
|---|---|---|---|
| 1 | 91701 | Rancho Cucamonga | 87 |
| 2 | 91708 | Chino | 87 |
| 3 | 91709 | Chino Hills | 87 |
| 4 | 91710 | Chino | 87 |
| 5 | 91730 | Rancho Cucamonga | 87 |
| 6 | 91737 | Rancho Cucamonga | 87 |
| 7 | 91739 | Rancho Cucamonga | 87 |
| 8 | 91752 | Jurupa Valley | 87 |
| 9 | 91761 | Ontario | 87 |
| 10 | 91762 | Ontario | 87 |
| 11 | 91763 | Montclair | 87 |
| 12 | 91764 | Ontario | 87 |
| 13 | 91784 | Upland | 87 |
| 14 | 91786 | Upland | 87 |
| 15 | 92201 | Indio | 87 |
| 16 | 92203 | Indio | 87 |
| 17 | 92210 | Indian Wells | 87 |
| 18 | 92211 | Palm Desert | 87 |
| 19 | 92220 | Banning | 87 |
| 20 | 92223 | Beaumont | 87 |
| 21 | 92225 | Blythe | 87 |
| 22 | 92230 | Cabazon | 87 |
| 23 | 92234 | Cathedral City | 87 |
| 24 | 92236 | Coachella | 87 |
| 25 | 92239 | Desert Center | 87 |
| 26 | 92240 | Desert Hot Springs | 87 |
| 27 | 92241 | Sky Valley | 87 |
| 28 | 92242 | Big River | 87 |
| 29 | 92252 | Joshua Tree | 87 |
| 30 | 92253 | La Quinta | 87 |
| 31 | 92254 | North Shore | 87 |
| 32 | 92256 | Morongo Valley | 87 |
| 33 | 92258 | Palm Springs | 87 |
| 34 | 92260 | Palm Desert | 87 |
| 35 | 92262 | Palm Springs | 87 |
| 36 | 92264 | Palm Springs | 87 |
| 37 | 92267 | — | 87 |
| 38 | 92268 | — | 87 |
| 39 | 92270 | Rancho Mirage | 87 |
| 40 | 92274 | Oasis | 87 |
| 41 | 92276 | Thousand Palms | 87 |
| 42 | 92277 | Twentynine Palms | 87 |
| 43 | 92278 | Twentynine Palms | 87 |
| 44 | 92280 | — | 87 |
| 45 | 92282 | Whitewater | 87 |
| 46 | 92284 | Yucca Valley | 87 |
| 47 | 92285 | Homestead Valley | 87 |
| 48 | 92301 | Adelanto | 87 |
| 49 | 92304 | — | 87 |
| 50 | 92305 | — | 87 |
Methodology
This ranking is based on EPA Air Quality Index data, scoped to California ZIP codes. Up to 50 ZIP codes are listed, ordered by median aqi. Data is refreshed periodically. See our methodology page for full details on data sources and update frequency.