United States · California · 65 places
Air quality in California today The AQI right now, city by city
Right now, Pomona has the cleanest air of the 62 California cities we track (AQI 6, Good), and Fresno the worst (AQI 83, Moderate). Chico has the most tree cover, at 52.5% — #11 of 278 large US cities.
Every place is measured the same way, over the same 1.2 mi (2 km) around its center: the air quality right now, from ground stations where there are any, and its tree cover.
Average right now
AQI 38
Good
- places tracked
- 65
- average tree cover
- 13.9%
- US cities: 25.1%
- worst air now: Fresno
- 83
- cleanest air now: Pomona
- 6
Lower is better on the US EPA index: 0–50 is Good, above 300 is Hazardous. Measured by Airleaf, refreshed hourly.
California · average AQI 38
Air quality today across California, city by city
| Los Angeles | 39Good | 4.5% | 80.0K | #268 of 278 |
|---|---|---|---|---|
| San Diego | 22Good | 7.0% | 49.6K | #253 of 278 |
| San Jose | 55Moderate | 17.1% | 40.5K | #178 of 278 |
| San Francisco | 44Good | 5.8% | 76.0K | #260 of 278 |
| Fresno | 83Moderate | 11.9% | 56.9K | #216 of 278 |
| Sacramento | 65Moderate | 25.6% | 13.3K | #134 of 278 |
| Long Beach | 75Moderate | 6.2% | 55.4K | #258 of 278 |
| Oakland | 22Good | 6.7% | 64.0K | #254 of 278 |
| Bakersfield | 69Moderate | 8.1% | 68.8K | #248 of 278 |
| Anaheim | 57Moderate | 10.6% | 60.9K | #229 of 278 |
| Riverside | 38Good | 21.7% | 26.1K | #149 of 278 |
| Santa Ana | 33Good | 13.4% | 52.1K | #207 of 278 |
| Stockton | 64Moderate | 15.9% | 43.9K | #183 of 278 |
| Chula Vista | 22Good | 5.7% | 76.1K | #261 of 278 |
| Irvine | 24Good | 27.8% | 6.9K | #115 of 278 |
| Fremont | 44Good | 15.4% | 45.7K | #187 of 278 |
| San Bernardino | 35Good | 6.4% | 74.1K | #255 of 278 |
| Fontana | 59Moderate | 7.6% | 70.4K | #249 of 278 |
| Modesto | 77Moderate | 25.5% | 14.1K | #135 of 278 |
| Oxnard | 19Good | 5.1% | 78.2K | #266 of 278 |
| Moreno Valley | 25Good | 6.3% | 74.5K | #256 of 278 |
| Huntington Beach | 63Moderate | 9.0% | 46.1K | #240 of 278 |
| Santa Clarita | 13Good | 22.4% | 23.9K | #147 of 278 |
| Santa Rosa | 26Good | 26.3% | 11.6K | #127 of 278 |
| Oceanside | 26Good | 10.1% | 41.1K | #234 of 278 |
| Rancho Cucamonga | 59Moderate | 12.9% | 53.7K | #210 of 278 |
| Hollywood | 37Good | 16.9% | 41.2K | — |
| Elk Grove | 52Moderate | 21.1% | 27.9K | #152 of 278 |
| Corona | 59Moderate | 9.1% | 65.7K | #238 of 278 |
| Lancaster | 17Good | 8.7% | 66.9K | #242 of 278 |
| Palmdale | 17Good | 4.1% | 81.4K | #270 of 278 |
| Hayward | 29Good | 19.8% | 32.0K | #159 of 278 |
| Salinas | 28Good | 5.4% | 77.3K | #263 of 278 |
| Sunnyvale | 23Good | 19.3% | 33.6K | #164 of 278 |
| Pomona | 6Good | 13.3% | 52.5K | #208 of 278 |
| Escondido | 20Good | 9.0% | 66.0K | #239 of 278 |
| Valencia | 13Good | 11.1% | 59.4K | — |
| Torrance | 68Moderate | 8.3% | 68.2K | #244 of 278 |
| Van Nuys | 34Good | 18.8% | 35.2K | — |
| Roseville | 52Moderate | 22.8% | 22.6K | #145 of 278 |
| Visalia | 62Moderate | 13.0% | 53.4K | #209 of 278 |
| Thousand Oaks | 39Good | 20.4% | 30.2K | #156 of 278 |
| Concord | 17Good | 22.1% | 24.8K | #148 of 278 |
| Simi Valley | 17Good | 14.2% | 49.6K | #198 of 278 |
| Victorville | 28Good | 11.5% | 58.1K | #219 of 278 |
| Vallejo | 11Good | 13.8% | 43.8K | #201 of 278 |
| Chico | 12Good | 52.5% | — | #11 of 278 |
| El Monte | 33Good | 8.6% | 67.2K | #243 of 278 |
| Downey | 55Moderate | 10.5% | 61.3K | #230 of 278 |
| Fairfield | 7Good | 11.4% | 57.6K | #220 of 278 |
| Inglewood | 50Good | 10.7% | 60.6K | #228 of 278 |
| Antioch | 17Good | 13.7% | 45.9K | #203 of 278 |
| Temecula | 26Good | 25.7% | 13.5K | #132 of 278 |
| Murrieta | 23Good | 13.5% | 51.8K | #206 of 278 |
| West Covina | 18Good | 11.8% | 57.2K | #217 of 278 |
| Daly City | 54Moderate | 16.5% | 42.4K | #179 of 278 |
| Burbank | 34Good | 14.7% | 48.1K | #192 of 278 |
| Santa Maria | 33Good | 7.2% | 71.6K | #252 of 278 |
| Clovis | 77Moderate | 11.0% | 59.5K | #223 of 278 |
| El Cajon | 20Good | 4.1% | 81.4K | #269 of 278 |
| San Mateo | 49Good | 29.6% | 1.3K | #99 of 278 |
| Vista | 26Good | 14.1% | 50.0K | — |
| Compton | 65Moderate | 7.1% | 71.9K | — |
| Pasadena | 27Good | 25.8% | 13.2K | #131 of 278 |
| Richmond | 11Good | 5.2% | 77.9K | #264 of 278 |
Air quality is the US AQI from ground monitoring stations via OpenAQ where available, otherwise the Open-Meteo / CAMS model, refreshed hourly. Tree cover is measured within 1.2 mi (2 km) of each city center from Sentinel-2 imagery. The US greenness rank covers cities of 100,000+ people; see the full ranking.
Deforestation · 2001–2025
How much forest has California lost?
Since 2001, California has lost about 7.73 million acres (3.13 million hectares) of forest (about 31,000 km²): 32% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 347,000 acres (141,000 hectares) (4.5%) was deforestation: forest cleared for good for farms, mines or towns.
- Forest lost since 2001
- 7.73 million acres (3.13 million ha)about 31,000 km²
- Share of its forest
- 32%of what there was in 2000
- Cleared for good
- 347,000 acres (141,000 ha)deforestation: turned into farms, mines or towns
Acres of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 16,900 acres (6,820 ha) | 112,000 acres (45,500 ha) | 129,000 acres (52,300 ha) |
| 2002 | 14,500 acres (5,880 ha) | 156,000 acres (63,200 ha) | 171,000 acres (69,000 ha) |
| 2003 | 14,200 acres (5,750 ha) | 137,000 acres (55,600 ha) | 152,000 acres (61,400 ha) |
| 2004 | 14,100 acres (5,710 ha) | 151,000 acres (61,100 ha) | 165,000 acres (66,800 ha) |
| 2005 | 16,400 acres (6,660 ha) | 100,000 acres (40,500 ha) | 117,000 acres (47,200 ha) |
| 2006 | 19,300 acres (7,820 ha) | 194,000 acres (78,400 ha) | 213,000 acres (86,200 ha) |
| 2007 | 17,000 acres (6,860 ha) | 322,000 acres (130,000 ha) | 339,000 acres (137,000 ha) |
| 2008 | 19,900 acres (8,040 ha) | 510,000 acres (206,000 ha) | 530,000 acres (214,000 ha) |
| 2009 | 21,600 acres (8,730 ha) | 261,000 acres (106,000 ha) | 282,000 acres (114,000 ha) |
| 2010 | 12,000 acres (4,870 ha) | 76,200 acres (30,800 ha) | 88,200 acres (35,700 ha) |
| 2011 | 16,200 acres (6,540 ha) | 64,900 acres (26,300 ha) | 81,100 acres (32,800 ha) |
| 2012 | 12,500 acres (5,050 ha) | 139,000 acres (56,200 ha) | 151,000 acres (61,300 ha) |
| 2013 | 5,240 acres (2,120 ha) | 125,000 acres (50,400 ha) | 130,000 acres (52,600 ha) |
| 2014 | 11,400 acres (4,620 ha) | 263,000 acres (106,000 ha) | 275,000 acres (111,000 ha) |
| 2015 | 8,790 acres (3,560 ha) | 198,000 acres (80,200 ha) | 207,000 acres (83,800 ha) |
| 2016 | 17,100 acres (6,910 ha) | 388,000 acres (157,000 ha) | 405,000 acres (164,000 ha) |
| 2017 | 20,300 acres (8,210 ha) | 383,000 acres (155,000 ha) | 404,000 acres (163,000 ha) |
| 2018 | 10,600 acres (4,300 ha) | 471,000 acres (191,000 ha) | 482,000 acres (195,000 ha) |
| 2019 | 16,300 acres (6,580 ha) | 295,000 acres (119,000 ha) | 311,000 acres (126,000 ha) |
| 2020 | 9,930 acres (4,020 ha) | 788,000 acres (319,000 ha) | 798,000 acres (323,000 ha) |
| 2021 | 11,800 acres (4,770 ha) | 1.12 million acres (451,000 ha) | 1.13 million acres (456,000 ha) |
| 2022 | 10,400 acres (4,210 ha) | 441,000 acres (178,000 ha) | 451,000 acres (183,000 ha) |
| 2023 | 15,200 acres (6,160 ha) | 224,000 acres (90,500 ha) | 239,000 acres (96,600 ha) |
| 2024 | 8,490 acres (3,440 ha) | 291,000 acres (118,000 ha) | 299,000 acres (121,000 ha) |
| 2025 | 7,200 acres (2,920 ha) | 177,000 acres (71,400 ha) | 184,000 acres (74,300 ha) |
Forest loss has stayed about the same: about 460,000 acres (186,000 hectares) a year in 2021–2025, against 480,000 acres (194,000 hectares) a year in 2016–2020. The worst year was 2021, when about 1.13 million acres (456,000 hectares) of forest were lost, mostly to wildfires.
What is causing deforestation in California?
- Wildfirescan grow back79% · 6.12 million acres (2.48 million ha)
- Loggingcan grow back15% · 1.15 million acres (467,000 ha)
- Farms, pasture and plantationscleared for good3.8% · 292,000 acres (118,000 ha)
Also: storms, floods and other natural causes, towns and roads, mining and energy, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
Source: Hansen/UMD/Google/USGS/NASA, Global Forest Change (GFC-2025-v1.13); causes: WRI/Google DeepMind drivers of forest loss; both CC BY 4.0, summed by Airleaf for each area. How it's measured
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