City report · California, United States
Concord Air quality today
Air quality in Concord currently reads AQI 8 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 8
Good
- PM2.5, fine particles (µg/m³)
- 1.0
- tree cover
- 22.1%
- trees in this area
- 69.4K
- more trees needed
- 24.8K
Measured across a 1.2 mi (2 km) radius around Concord, 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.
Concord · AQI 8 (Good)
Concord's tree count comes to 69,360 trees across 4.8 sq mi (12.56 km²) of land, 8 points below the 30% tree-cover level considered healthy for this area, so roughly 24,794 more trees would close the gap.
Air quality detail
Air quality in Concord today: AQI 8, Good
Main pollutant: NO₂ · Observed Nov 11, 06:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Concord, 2.7 mi (4.4 km) away
Health signal
Air quality is satisfactory for everyone.
PM2.5
1.0
PM10
—
NO₂
15.4
O₃
3.9
SO₂
1.8
CO
343.7
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 Concord's daily AQI at 77 on average, from 49 on Nov 4 to an hourly peak of 117 on Nov 7.
Where Concord stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Concord: Below target
22.1% tree cover against a 30% healthy-neighborhood target, across 4.8 sq mi (12.56 km²) of land.
Trees in this area
69,360
Target trees
94,154
More trees needed
24,794
CO₂ if planted / yr
545.5 t
Deforestation · 2001–2025
How much forest has Concord lost?
Since 2001, the area within 10 km of Concord has lost about 134 acres (54 hectares) of forest (about 100 football fields): 2.3% of the forest it had in 2000. Most of it (50%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 134 acres (54 ha)about 100 football fields
- Share of its forest
- 2.3%of what there was in 2000
- Cleared for good
- 67 acres (27 ha)deforestation: turned into farms, mines or towns
The worst year was 2018, when about 23 acres (9 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 | 6 acres (2 ha) | 6 acres (2 ha) | 12 acres (5 ha) |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | 7 acres (3 ha) | 3 acres (1 ha) | 10 acres (4 ha) |
| 2004 | under 1 ha | under 1 ha | 3 acres (1 ha) |
| 2005 | 8 acres (3 ha) | 5 acres (2 ha) | 13 acres (5 ha) |
| 2006 | 4 acres (2 ha) | 6 acres (3 ha) | 10 acres (4 ha) |
| 2007 | 5 acres (2 ha) | 2 acres (1 ha) | 7 acres (3 ha) |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | 2 acres (1 ha) | under 1 ha | 3 acres (1 ha) |
| 2010 | 7 acres (3 ha) | 2 acres (1 ha) | 9 acres (4 ha) |
| 2011 | under 1 ha | 3 acres (1 ha) | 3 acres (1 ha) |
| 2012 | 3 acres (1 ha) | 8 acres (3 ha) | 11 acres (4 ha) |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | 13 acres (5 ha) | under 1 ha | 13 acres (5 ha) |
| 2015 | under 1 ha | under 1 ha | 3 acres (1 ha) |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | 3 acres (1 ha) | under 1 ha | 4 acres (2 ha) |
| 2018 | under 1 ha | 23 acres (9 ha) | 23 acres (9 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 Concord?
- Towns and roadscleared for good29% · 39 acres (16 ha)
- Farms, pasture and plantationscleared for good19% · 25 acres (10 ha)
- Wildfirescan grow back17% · 23 acres (9 ha)
Also: storms, floods and other natural causes, 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
- 19,200 acres (7,770 ha)
- Forest in 2020
- 20,100 acres (8,130 ha)
- Overall change
- +877 acres (355 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Concord grew from about 19,200 acres (7,770 hectares) to 20,100 acres (8,130 hectares), a net gain of about 877 acres (355 hectares) (+4.6%). New forest grew on about 939 acres (380 hectares), while 60 acres (24 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 Concord
Same 2 km radius, same index — so they compare directly.
- Antioch20.0 km
United States
- Tree cover
- 14%
- Air quality
- 8
- Vallejo24.2 km
United States
- Tree cover
- 14%
- Air quality
- 7
- Richmond28.2 km
United States
- Tree cover
- 5%
- Air quality
- 10
- Oakland28.5 km
United States
- Tree cover
- 7%
- Air quality
- 31
- Fairfield30.2 km
United States
- Tree cover
- 11%
- Air quality
- 8
- Hayward34.7 km
United States
- Tree cover
- 20%
- Air quality
- 29
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Frequently asked
Questions about Concord
What is the air quality (AQI) in Concord right now?
The latest reading for Concord shows an AQI of 8 (Good), measured Nov 11, 06:00 local time by the Concord ground monitoring station, 2.7 mi (4.4 km) away, via OpenAQ. The main pollutant is NO₂. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Concord today?
At AQI 8 (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 Concord been like this week?
Over the last 7 days, the CAMS air-quality model put Concord's daily AQI at 77 on average, from 49 on Nov 4 to an hourly peak of 117 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 Concord lost since 2001?
Since 2001, the area within 10 km of Concord has lost about 134 acres (54 hectares) of forest (about 100 football fields): 2.3% of the forest it had in 2000. Most of it (50%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Concord grew from about 19,200 acres (7,770 hectares) to 20,100 acres (8,130 hectares), a net gain of about 877 acres (355 hectares) (+4.6%). New forest grew on about 939 acres (380 hectares), while 60 acres (24 hectares) were lost.
What is the tree count in Concord?
Concord has an estimated 69,360 trees across the 4.8 sq mi (12.56 km²) of land measured — 22.1% tree cover, 8 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Concord need?
Concord needs roughly 24,794 more trees to close a 8-point shortfall against its 30% tree-cover target — about 545.5 t of extra CO₂ absorbed per year once grown.
How are Concord's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Concord, 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 Concord; the tree count is an estimate derived from that cover.
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