City report · California, United States
Stockton Air quality today
Air quality in Stockton currently reads AQI 60 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 60
Moderate
- PM2.5, fine particles (µg/m³)
- 14.0
- tree cover
- 15.9%
- trees in this area
- 49.5K
- more trees needed
- 43.9K
Measured across a 1.2 mi (2 km) radius around Civic Center, Stockton, 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.
Stockton · AQI 60 (Moderate)
Stockton's tree count comes to 49,502 trees across 4.8 sq mi (12.46 km²) of land, 14 points below the 30% tree-cover level considered healthy for this area, so roughly 43,898 more trees would close the gap.
Air quality detail
Air quality in Stockton today: AQI 60, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 06:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Stockton - Universit, 0.6 mi (900 m) away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
14.0
PM10
32.0
NO₂
34.1
O₃
0.0
SO₂
—
CO
—
Data: OpenAQ · AirNow
- Outdoor exercise
- Fine for most people; unusually sensitive people should take long or hard exercise easier
- Windows
- Fine to open; close them if you are sensitive to pollution
- Mask
- Not needed for most people
- Air purifier
- Worth running if you are sensitive
Over the last 7 days, the CAMS air-quality model put Stockton's daily AQI at 65 on average, from 48 on Nov 4 to an hourly peak of 107 on Nov 6.
Where Stockton stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Stockton: Critically low
15.9% tree cover against a 30% healthy-neighborhood target, across 4.8 sq mi (12.46 km²) of land.
Trees in this area
49,502
Target trees
93,400
More trees needed
43,898
CO₂ if planted / yr
965.8 t
Deforestation · 2001–2025
How much forest has Stockton lost?
Since 2001, the area within 10 km of Stockton has lost about 538 acres (218 hectares) of forest (about 410 football fields): 14% of the forest it had in 2000. Most of it (95%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km northeast of the city center.
- Forest lost since 2001
- 538 acres (218 ha)about 410 football fields
- Share of its forest
- 14%of what there was in 2000
- Cleared for good
- 513 acres (208 ha)deforestation: turned into farms, mines or towns
The worst year was 2005, when about 72 acres (29 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 | 9 acres (4 ha) | under 1 ha | 9 acres (4 ha) |
| 2002 | 15 acres (6 ha) | under 1 ha | 15 acres (6 ha) |
| 2003 | 30 acres (12 ha) | under 1 ha | 31 acres (12 ha) |
| 2004 | 10 acres (4 ha) | under 1 ha | 11 acres (5 ha) |
| 2005 | 68 acres (27 ha) | 4 acres (2 ha) | 72 acres (29 ha) |
| 2006 | 50 acres (20 ha) | 6 acres (3 ha) | 56 acres (23 ha) |
| 2007 | 22 acres (9 ha) | under 1 ha | 24 acres (10 ha) |
| 2008 | 30 acres (12 ha) | under 1 ha | 31 acres (13 ha) |
| 2009 | 31 acres (13 ha) | under 1 ha | 32 acres (13 ha) |
| 2010 | 60 acres (24 ha) | under 1 ha | 61 acres (25 ha) |
| 2011 | 5 acres (2 ha) | under 1 ha | 5 acres (2 ha) |
| 2012 | 13 acres (5 ha) | under 1 ha | 15 acres (6 ha) |
| 2013 | 8 acres (3 ha) | under 1 ha | 9 acres (4 ha) |
| 2014 | 14 acres (6 ha) | under 1 ha | 14 acres (6 ha) |
| 2015 | 8 acres (3 ha) | under 1 ha | 8 acres (3 ha) |
| 2016 | 11 acres (5 ha) | under 1 ha | 11 acres (5 ha) |
| 2017 | 46 acres (18 ha) | under 1 ha | 46 acres (19 ha) |
| 2018 | 9 acres (4 ha) | under 1 ha | 9 acres (4 ha) |
| 2019 | 21 acres (8 ha) | under 1 ha | 21 acres (8 ha) |
| 2020 | 13 acres (5 ha) | under 1 ha | 14 acres (6 ha) |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | 13 acres (5 ha) | under 1 ha | 13 acres (5 ha) |
| 2023 | 15 acres (6 ha) | under 1 ha | 15 acres (6 ha) |
| 2024 | 10 acres (4 ha) | under 1 ha | 10 acres (4 ha) |
| 2025 | 2 acres (1 ha) | under 1 ha | 3 acres (1 ha) |
What is causing deforestation around Stockton?
- Farms, pasture and plantationscleared for good69% · 373 acres (151 ha)
- Towns and roadscleared for good26% · 140 acres (57 ha)
- Unknown causescause unknown4.5% · 24 acres (10 ha)
Also: logging.
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
- 4,570 acres (1,850 ha)
- Forest in 2020
- 4,880 acres (1,970 ha)
- Overall change
- +311 acres (126 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Stockton grew from about 4,570 acres (1,850 hectares) to 4,880 acres (1,970 hectares), a net gain of about 311 acres (126 hectares) (+6.8%). New forest grew on about 655 acres (265 hectares), while 341 acres (138 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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Frequently asked
Questions about Stockton
What is the air quality (AQI) in Stockton right now?
The latest reading for Stockton shows an AQI of 60 (Moderate), measured Nov 11, 06:00 local time by the Stockton - Universit ground monitoring station, 0.6 mi (900 m) away, via OpenAQ. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Stockton today?
At AQI 60 (Moderate): fine for most people; unusually sensitive people should take long or hard exercise easier. Windows: fine to open; close them if you are sensitive to pollution. Masks: not needed for most people. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Stockton been like this week?
Over the last 7 days, the CAMS air-quality model put Stockton's daily AQI at 65 on average, from 48 on Nov 4 to an hourly peak of 107 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Stockton lost since 2001?
Since 2001, the area within 10 km of Stockton has lost about 538 acres (218 hectares) of forest (about 410 football fields): 14% of the forest it had in 2000. Most of it (95%) was deforestation, forest cleared for good, mainly for farms, pasture and plantations. Comparing satellite maps from 2000 and 2020, the forest around Stockton grew from about 4,570 acres (1,850 hectares) to 4,880 acres (1,970 hectares), a net gain of about 311 acres (126 hectares) (+6.8%). New forest grew on about 655 acres (265 hectares), while 341 acres (138 hectares) were lost.
What is the tree count in Stockton?
Stockton has an estimated 49,502 trees across the 4.8 sq mi (12.46 km²) of land measured — 15.9% tree cover, 14 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Stockton need?
Stockton needs roughly 43,898 more trees to close a 14-point shortfall against its 30% tree-cover target — about 965.8 t of extra CO₂ absorbed per year once grown.
How are Stockton's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Civic Center, 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 Civic Center; the tree count is an estimate derived from that cover.
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