City report · California, United States
West Covina Air quality today
Air quality in West Covina currently reads AQI 17 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 17
Good
- PM2.5, fine particles (µg/m³)
- 3.1
- tree cover
- 11.8%
- trees in this area
- 37.1K
- more trees needed
- 57.2K
Measured across a 1.2 mi (2 km) radius around Walnut Valley, West Covina, 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.
West Covina · AQI 17 (Good)
West Covina's tree count comes to 37,071 trees across 4.9 sq mi (12.57 km²), 18 points below the 30% tree-cover level considered healthy for this area, so roughly 57,177 more trees would close the gap.
Air quality detail
Air quality in West Covina today: AQI 17, 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 · RollingHills, 4.8 mi (7.8 km) away · median of 2 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.1
PM10
—
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirGradient, latca
- 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 West Covina's daily AQI at 50 on average, from 42 on Nov 6 to an hourly peak of 79 on Nov 4.
Where West Covina stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in West Covina: Critically low
11.8% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
37,071
Target trees
94,248
More trees needed
57,177
CO₂ if planted / yr
1,258 t
Deforestation · 2001–2025
How much forest has West Covina lost?
Since 2001, the area within 10 km of West Covina has lost about 134 acres (54 hectares) of forest (about 100 football fields): 16% of the forest it had in 2000. Most of it (62%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from June 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
- 16%of what there was in 2000
- Cleared for good
- 83 acres (34 ha)deforestation: turned into farms, mines or towns
The worst year was 2006, when about 44 acres (18 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 | 2 acres (1 ha) | under 1 ha | 3 acres (1 ha) |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | 10 acres (4 ha) | under 1 ha | 11 acres (4 ha) |
| 2004 | 8 acres (3 ha) | under 1 ha | 9 acres (4 ha) |
| 2005 | 9 acres (4 ha) | under 1 ha | 11 acres (4 ha) |
| 2006 | 42 acres (17 ha) | 2 acres (1 ha) | 44 acres (18 ha) |
| 2007 | under 1 ha | under 1 ha | under 1 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 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | 5 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 | 2 acres (1 ha) |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | 37 acres (15 ha) | 38 acres (16 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 | 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 West Covina?
- Towns and roadscleared for good53% · 71 acres (29 ha)
- Wildfirescan grow back33% · 44 acres (18 ha)
- Farms, pasture and plantationscleared for good9% · 12 acres (5 ha)
Also: 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
- 4,420 acres (1,790 ha)
- Forest in 2020
- 4,390 acres (1,780 ha)
- Overall change
- −22 acres (9 ha)less forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around West Covina stayed about the same size, at about 4,390 acres (1,780 hectares): new forest grew on about 157 acres (64 hectares), and about 180 acres (73 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 West Covina
Same 2 km radius, same index — so they compare directly.
- Pomona17.3 km
United States
- Tree cover
- 13%
- Air quality
- 49
- Pasadena20.9 km
United States
- Tree cover
- 26%
- Air quality
- 26
- Downey22.9 km
United States
- Tree cover
- 11%
- Air quality
- 55
- Anaheim26.0 km
United States
- Tree cover
- 11%
- Air quality
- 57
- Los Angeles28.1 km
United States
- Tree cover
- 5%
- Air quality
- 39
- Rancho Cucamonga32.1 km
United States
- Tree cover
- 13%
- Air quality
- 37
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Frequently asked
Questions about West Covina
What is the air quality (AQI) in West Covina right now?
The latest reading for West Covina shows an AQI of 17 (Good), measured Nov 11, 07:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is RollingHills, 4.8 mi (7.8 km) away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in West Covina today?
At AQI 17 (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 West Covina been like this week?
Over the last 7 days, the CAMS air-quality model put West Covina's daily AQI at 50 on average, from 42 on Nov 6 to an hourly peak of 79 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 West Covina lost since 2001?
Since 2001, the area within 10 km of West Covina has lost about 134 acres (54 hectares) of forest (about 100 football fields): 16% of the forest it had in 2000. Most of it (62%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around West Covina stayed about the same size, at about 4,390 acres (1,780 hectares): new forest grew on about 157 acres (64 hectares), and about 180 acres (73 hectares) were lost.
What is the tree count in West Covina?
West Covina has an estimated 37,071 trees across the 4.9 sq mi (12.57 km²) measured — 11.8% tree cover, 18 percentage points short of the 30% tree-cover target set for this area.
How many more trees does West Covina need?
West Covina needs roughly 57,177 more trees to close a 18-point shortfall against its 30% tree-cover target — about 1,258 t of extra CO₂ absorbed per year once grown.
How are West Covina's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Walnut Valley, 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 Walnut Valley; the tree count is an estimate derived from that cover.
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