City report · California, United States
Pomona Air quality today
Air quality in Pomona currently reads AQI 49 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 49
Good
- PM2.5, fine particles (µg/m³)
- 8.9
- tree cover
- 13.3%
- trees in this area
- 41.8K
- more trees needed
- 52.5K
Measured across a 1.2 mi (2 km) radius around Pomona, 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.
Pomona · AQI 49 (Good)
Pomona's tree count comes to 41,783 trees across 4.9 sq mi (12.57 km²), 17 points below the 30% tree-cover level considered healthy for this area, so roughly 52,465 more trees would close the gap.
Air quality detail
Air quality in Pomona today: AQI 49, Good
Main pollutant: PM2.5 · Observed Nov 11, 06:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Glendora - Laurel, 8.3 mi (13.4 km) away · median of 6 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
8.9
PM10
18.5
NO₂
59.7
O₃
12.8
SO₂
1.1
CO
458.2
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 Pomona's daily AQI at 43 on average, from 30 on Nov 6 to an hourly peak of 88 on Nov 4.
Where Pomona stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Pomona: Critically low
13.3% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
41,783
Target trees
94,248
More trees needed
52,465
CO₂ if planted / yr
1,154 t
Deforestation · 2001–2025
How much forest has Pomona lost?
Since 2001, the area within 10 km of Pomona has lost about 141 acres (57 hectares) of forest (about 110 football fields): 19% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 54 acres (22 hectares) (38%) 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
- 141 acres (57 ha)about 110 football fields
- Share of its forest
- 19%of what there was in 2000
- Cleared for good
- 54 acres (22 ha)deforestation: turned into farms, mines or towns
The worst year was 2003, when about 92 acres (37 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 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | 22 acres (9 ha) | 70 acres (28 ha) | 92 acres (37 ha) |
| 2004 | under 1 ha | 8 acres (3 ha) | 10 acres (4 ha) |
| 2005 | 13 acres (5 ha) | under 1 ha | 15 acres (6 ha) |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | under 1 ha | under 1 ha | 4 acres (2 ha) |
| 2008 | 6 acres (2 ha) | under 1 ha | 7 acres (3 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 | 6 acres (2 ha) | under 1 ha | 7 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 | 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 Pomona?
- Wildfirescan grow back54% · 76 acres (31 ha)
- Towns and roadscleared for good38% · 54 acres (22 ha)
- Unknown causescause unknown8% · 11 acres (5 ha)
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
- 5,350 acres (2,170 ha)
- Forest in 2020
- 5,510 acres (2,230 ha)
- Overall change
- +151 acres (61 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Pomona grew from about 5,350 acres (2,170 hectares) to 5,510 acres (2,230 hectares), a net gain of about 151 acres (61 hectares) (+2.8%). New forest grew on about 188 acres (76 hectares), while 39 acres (16 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.
- Rancho Cucamonga15.7 km
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- Air quality
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- El Monte25.4 km
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- Air quality
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- Corona26.4 km
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- Air quality
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- Anaheim28.7 km
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- Air quality
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- Fontana29.5 km
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- Air quality
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Frequently asked
Questions about Pomona
What is the air quality (AQI) in Pomona right now?
The latest reading for Pomona shows an AQI of 49 (Good), measured Nov 11, 06:00 local time by 6 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Glendora - Laurel, 8.3 mi (13.4 km) away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Pomona today?
At AQI 49 (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 Pomona been like this week?
Over the last 7 days, the CAMS air-quality model put Pomona's daily AQI at 43 on average, from 30 on Nov 6 to an hourly peak of 88 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 Pomona lost since 2001?
Since 2001, the area within 10 km of Pomona has lost about 141 acres (57 hectares) of forest (about 110 football fields): 19% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 54 acres (22 hectares) (38%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Pomona grew from about 5,350 acres (2,170 hectares) to 5,510 acres (2,230 hectares), a net gain of about 151 acres (61 hectares) (+2.8%). New forest grew on about 188 acres (76 hectares), while 39 acres (16 hectares) were lost.
What is the tree count in Pomona?
Pomona has an estimated 41,783 trees across the 4.9 sq mi (12.57 km²) measured — 13.3% tree cover, 17 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Pomona need?
Pomona needs roughly 52,465 more trees to close a 17-point shortfall against its 30% tree-cover target — about 1,154 t of extra CO₂ absorbed per year once grown.
How are Pomona's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Pomona, 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 Pomona; the tree count is an estimate derived from that cover.
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