City report · California, United States
Vallejo Air quality today
Air quality in Vallejo currently reads AQI 7 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 7
Good
- PM2.5, fine particles (µg/m³)
- 1.0
- tree cover
- 13.8%
- trees in this area
- 37.3K
- more trees needed
- 43.8K
Measured across a 1.2 mi (2 km) radius around Vallejo, CA, USA (4.9 sq mi), from a satellite image of Sep 15, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Vallejo · AQI 7 (Good)
Vallejo's tree count comes to 37,284 trees across 4.2 sq mi (10.81 km²) of land, 16 points below the 30% tree-cover level considered healthy for this area, so roughly 43,769 more trees would close the gap.
Air quality detail
Air quality in Vallejo today: AQI 7, Good
Main pollutant: NO₂ · Observed Nov 11, 06:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · San Pablo - Rumrill, 11.3 mi (18.2 km) away · median of 4 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
1.0
PM10
—
NO₂
14.0
O₃
9.8
SO₂
1.6
CO
286.4
Data: OpenAQ · AirNow
- 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 Vallejo's daily AQI at 57 on average, from 44 on Nov 4 to an hourly peak of 97 on Nov 7.
Where Vallejo stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Vallejo: Critically low
13.8% tree cover against a 30% healthy-neighborhood target, across 4.2 sq mi (10.81 km²) of land.
Trees in this area
37,284
Target trees
81,053
More trees needed
43,769
CO₂ if planted / yr
962.9 t
Deforestation · 2001–2025
How much forest has Vallejo lost?
Since 2001, the area within 10 km of Vallejo has lost about 759 acres (307 hectares) of forest (about 570 football fields): 13% of the forest it had in 2000. Most of it (76%) was deforestation, forest cleared for good, mainly for mining and energy.
2017: satellite photo from June 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 759 acres (307 ha)about 570 football fields
- Share of its forest
- 13%of what there was in 2000
- Cleared for good
- 577 acres (233 ha)deforestation: turned into farms, mines or towns
The worst year was 2001, when about 250 acres (101 hectares) of forest were lost.
Acres of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | 195 acres (79 ha) | 55 acres (22 ha) | 250 acres (101 ha) |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | 75 acres (30 ha) | 53 acres (21 ha) | 128 acres (52 ha) |
| 2004 | 3 acres (1 ha) | under 1 ha | 3 acres (1 ha) |
| 2005 | 78 acres (32 ha) | 7 acres (3 ha) | 86 acres (35 ha) |
| 2006 | 21 acres (8 ha) | 16 acres (7 ha) | 37 acres (15 ha) |
| 2007 | 114 acres (46 ha) | 11 acres (5 ha) | 126 acres (51 ha) |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | 8 acres (3 ha) | 3 acres (1 ha) | 10 acres (4 ha) |
| 2012 | 50 acres (20 ha) | 2 acres (1 ha) | 53 acres (21 ha) |
| 2013 | under 1 ha | under 1 ha | 3 acres (1 ha) |
| 2014 | 9 acres (4 ha) | 3 acres (1 ha) | 11 acres (5 ha) |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | 3 acres (1 ha) | under 1 ha | 5 acres (2 ha) |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | 11 acres (4 ha) | under 1 ha | 11 acres (5 ha) |
| 2021 | 4 acres (2 ha) | 3 acres (1 ha) | 6 acres (3 ha) |
| 2022 | under 1 ha | 4 acres (2 ha) | 4 acres (2 ha) |
| 2023 | under 1 ha | 17 acres (7 ha) | 17 acres (7 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 Vallejo?
- Mining and energycleared for good39% · 299 acres (121 ha)
- Towns and roadscleared for good32% · 243 acres (98 ha)
- Storms, floods and other natural causescan grow back18% · 135 acres (55 ha)
Also: farms, pasture and plantations, wildfires, logging, 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
- 6,300 acres (2,550 ha)
- Forest in 2020
- 7,030 acres (2,840 ha)
- Overall change
- +731 acres (296 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Vallejo grew from about 6,300 acres (2,550 hectares) to 7,030 acres (2,840 hectares), a net gain of about 731 acres (296 hectares) (+12%). New forest grew on about 835 acres (338 hectares), while 104 acres (42 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
Measured cities near Vallejo
Same 2 km radius, same index — so they compare directly.
- Richmond20.3 km
United States
- Tree cover
- 5%
- Air quality
- 10
- Concord24.2 km
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- Tree cover
- 22%
- Air quality
- 8
- Fairfield24.9 km
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- Tree cover
- 11%
- Air quality
- 8
- Oakland33.3 km
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- Tree cover
- 7%
- Air quality
- 31
- San Francisco39.3 km
United States
- Tree cover
- 6%
- Air quality
- 51
- Antioch41.0 km
United States
- Tree cover
- 14%
- Air quality
- 8
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Frequently asked
Questions about Vallejo
What is the air quality (AQI) in Vallejo right now?
The latest reading for Vallejo shows an AQI of 7 (Good), measured Nov 11, 06:00 local time by 4 ground monitoring stations via OpenAQ (the median of their readings; the nearest is San Pablo - Rumrill, 11.3 mi (18.2 km) away). The main pollutant is NO₂. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Vallejo today?
At AQI 7 (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 Vallejo been like this week?
Over the last 7 days, the CAMS air-quality model put Vallejo's daily AQI at 57 on average, from 44 on Nov 4 to an hourly peak of 97 on Nov 7. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Vallejo lost since 2001?
Since 2001, the area within 10 km of Vallejo has lost about 759 acres (307 hectares) of forest (about 570 football fields): 13% of the forest it had in 2000. Most of it (76%) was deforestation, forest cleared for good, mainly for mining and energy. Comparing satellite maps from 2000 and 2020, the forest around Vallejo grew from about 6,300 acres (2,550 hectares) to 7,030 acres (2,840 hectares), a net gain of about 731 acres (296 hectares) (+12%). New forest grew on about 835 acres (338 hectares), while 104 acres (42 hectares) were lost.
What is the tree count in Vallejo?
Vallejo has an estimated 37,284 trees across the 4.2 sq mi (10.81 km²) of land measured — 13.8% tree cover, 16 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Vallejo need?
Vallejo needs roughly 43,769 more trees to close a 16-point shortfall against its 30% tree-cover target — about 962.9 t of extra CO₂ absorbed per year once grown.
How are Vallejo's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Vallejo, 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 Vallejo; the tree count is an estimate derived from that cover.
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