City report · California, United States
San Bernardino Air quality today
Air quality in San Bernardino currently reads AQI 35 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 35
Good
- PM2.5, fine particles (µg/m³)
- 6.3
- tree cover
- 6.4%
- trees in this area
- 20.1K
- more trees needed
- 74.1K
Measured across a 1.2 mi (2 km) radius around Carousel, San Bernardino, CA, USA (4.9 sq mi), from a satellite image of Sep 14, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
San Bernardino · AQI 35 (Good)
San Bernardino's tree count comes to 20,106 trees across 4.9 sq mi (12.57 km²), 24 points below the 30% tree-cover level considered healthy for this area, so roughly 74,142 more trees would close the gap.
Air quality detail
Air quality in San Bernardino today: AQI 35, Good
Main pollutant: PM2.5 · Observed Nov 11, 07:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · San Bernardino, 2.1 mi (3.3 km) away · median of 2 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.3
PM10
23.0
NO₂
45.7
O₃
2.0
SO₂
—
CO
—
Data: OpenAQ · AirNow, Clarity
- Outdoor exercise
- A good day to be active outside
- Windows
- Open them to air the house
- Mask
- Not needed
- Air purifier
- Not needed
Over the last 7 days, the CAMS air-quality model put San Bernardino's daily AQI at 39 on average, from 31 on Nov 6 to an hourly peak of 89 on Nov 4.
Where San Bernardino stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in San Bernardino: Critically low
6.4% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
20,106
Target trees
94,248
More trees needed
74,142
CO₂ if planted / yr
1,631 t
Deforestation · 2001–2025
How much forest has San Bernardino lost?
Since 2001, the area within 10 km of San Bernardino has lost about 386 acres (156 hectares) of forest (about 290 football fields): 83% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 179 acres (72 hectares) (46%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from June 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 386 acres (156 ha)about 290 football fields
- Share of its forest
- 83%of what there was in 2000
- Cleared for good
- 179 acres (72 ha)deforestation: turned into farms, mines or towns
The worst year was 2002, when about 180 acres (73 hectares) of forest were lost, mostly to wildfires.
Acres of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | under 1 ha | under 1 ha | under 1 ha |
| 2002 | 25 acres (10 ha) | 155 acres (63 ha) | 180 acres (73 ha) |
| 2003 | 15 acres (6 ha) | 22 acres (9 ha) | 37 acres (15 ha) |
| 2004 | 16 acres (7 ha) | 28 acres (11 ha) | 44 acres (18 ha) |
| 2005 | 49 acres (20 ha) | under 1 ha | 50 acres (20 ha) |
| 2006 | 15 acres (6 ha) | under 1 ha | 15 acres (6 ha) |
| 2007 | 11 acres (4 ha) | under 1 ha | 11 acres (5 ha) |
| 2008 | 27 acres (11 ha) | under 1 ha | 27 acres (11 ha) |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | 2 acres (1 ha) |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 6 acres (2 ha) | under 1 ha | 6 acres (3 ha) |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | 3 acres (1 ha) | under 1 ha | 3 acres (1 ha) |
| 2018 | 5 acres (2 ha) | under 1 ha | 5 acres (2 ha) |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | under 1 ha | under 1 ha | under 1 ha |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | under 1 ha | under 1 ha | under 1 ha |
What is causing deforestation around San Bernardino?
- Wildfirescan grow back52% · 201 acres (81 ha)
- Towns and roadscleared for good41% · 157 acres (63 ha)
- Farms, pasture and plantationscleared for good5.6% · 22 acres (9 ha)
Also: mining and energy, unknown causes.
Causes for 2025 are estimates, based on what caused forest loss in the same places up to 2024.
Forest gained and lost, 2000–2020
- Forest in 2000
- 2,240 acres (905 ha)
- Forest in 2020
- 1,900 acres (767 ha)
- Overall change
- −341 acres (138 ha)less forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around San Bernardino shrank from about 2,240 acres (905 hectares) to 1,900 acres (767 hectares), a net loss of about 341 acres (138 hectares) (−15%). New forest grew on about 81 acres (33 hectares), but 423 acres (171 hectares) were lost.
These 2000 and 2020 maps, from the University of Maryland, count any land with trees taller than 5 m as forest, including plantations and orchards. Forest that was cut or burned and had grown back by 2020 counts in both years, so the loss here is smaller than the yearly figures.
These figures cover everything within 10 km of the city center, a wider area than the report above, because forest is usually lost at a city's edges.
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. Forest gained and lost 2000–2020: Potapov et al. 2022, UMD GLAD Global Land Cover and Land Use Change, CC BY 4.0. Images: contains modified Copernicus Sentinel data. How it's measured
In the same region
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Same 2 km radius, same index — so they compare directly.
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Frequently asked
Questions about San Bernardino
What is the air quality (AQI) in San Bernardino right now?
The latest reading for San Bernardino shows an AQI of 35 (Good), measured Nov 11, 07:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is San Bernardino, 2.1 mi (3.3 km) away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in San Bernardino today?
At AQI 35 (Good): a good day to be active outside. Windows: open them to air the house. Masks: not needed. The reading changes through the day, so check again before a long run or ride.
What has the air quality in San Bernardino been like this week?
Over the last 7 days, the CAMS air-quality model put San Bernardino's daily AQI at 39 on average, from 31 on Nov 6 to an hourly peak of 89 on Nov 4. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around San Bernardino lost since 2001?
Since 2001, the area within 10 km of San Bernardino has lost about 386 acres (156 hectares) of forest (about 290 football fields): 83% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 179 acres (72 hectares) (46%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around San Bernardino shrank from about 2,240 acres (905 hectares) to 1,900 acres (767 hectares), a net loss of about 341 acres (138 hectares) (−15%). New forest grew on about 81 acres (33 hectares), but 423 acres (171 hectares) were lost.
What is the tree count in San Bernardino?
San Bernardino has an estimated 20,106 trees across the 4.9 sq mi (12.57 km²) measured — 6.4% tree cover, 24 percentage points short of the 30% tree-cover target set for this area.
How many more trees does San Bernardino need?
San Bernardino needs roughly 74,142 more trees to close a 24-point shortfall against its 30% tree-cover target — about 1,631 t of extra CO₂ absorbed per year once grown.
How are San Bernardino's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Carousel, via OpenAQ; the 7-day trend is the Open-Meteo / CAMS model's estimate. Tree cover is measured from Sentinel-2 L2A (ESA Copernicus) via Earth Search satellite imagery at 10 m detail across a 1.2 mi (2 km) radius around Carousel; the tree count is an estimate derived from that cover.
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