City report · California, United States
Fontana Air quality today
Air quality in Fontana currently reads AQI 29 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 29
Good
- PM2.5, fine particles (µg/m³)
- 1.9
- tree cover
- 7.6%
- trees in this area
- 23.9K
- more trees needed
- 70.4K
Measured across a 1.2 mi (2 km) radius around Fontana, 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.
Fontana · AQI 29 (Good)
Fontana's tree count comes to 23,876 trees across 4.9 sq mi (12.57 km²), 22 points below the 30% tree-cover level considered healthy for this area, so roughly 70,372 more trees would close the gap.
Air quality detail
Air quality in Fontana today: AQI 29, Good
Main pollutant: NO₂ · Observed Nov 11, 07:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Day Creek Square, 6.2 mi (10 km) away · median of 3 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
1.9
PM10
—
NO₂
59.3
O₃
23.6
SO₂
1.1
CO
458.2
Data: OpenAQ · AirGradient, AirNow, MattM
- 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 Fontana's daily AQI at 41 on average, from 30 on Nov 6 to an hourly peak of 88 on Nov 4.
Where Fontana stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Fontana: Critically low
7.6% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
23,876
Target trees
94,248
More trees needed
70,372
CO₂ if planted / yr
1,548 t
Deforestation · 2001–2025
How much forest has Fontana lost?
There was very little forest around Fontana in 2000, about 62 acres (25 hectares), and about 59 acres (24 hectares) of it has been lost since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here.
2017: satellite photo from June 2017 of a 5 × 5 km area in the city center.
The worst year was 2003, when about 43 acres (17 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 | 8 acres (3 ha) | 8 acres (3 ha) |
| 2002 | under 1 ha | 2 acres (1 ha) | 4 acres (2 ha) |
| 2003 | under 1 ha | 43 acres (17 ha) | 43 acres (17 ha) |
| 2004 | under 1 ha | 4 acres (2 ha) | 4 acres (2 ha) |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | under 1 ha | under 1 ha | under 1 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 | under 1 ha | under 1 ha | under 1 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 Fontana?
- Wildfirescan grow back94% · 56 acres (23 ha)
- Mining and energycleared for good1.7% · under 1 ha
- Towns and roadscleared for good1.7% · under 1 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
- 259 acres (105 ha)
- Forest in 2020
- 284 acres (115 ha)
- Overall change
- +25 acres (10 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Fontana grew from about 259 acres (105 hectares) to 284 acres (115 hectares), a net gain of about 25 acres (10 hectares) (+9.5%). New forest grew on about 32 acres (13 hectares), while 8 acres (3 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 Fontana
Same 2 km radius, same index — so they compare directly.
- San Bernardino13.5 km
United States
- Tree cover
- 6%
- Air quality
- 35
- Rancho Cucamonga14.6 km
United States
- Tree cover
- 13%
- Air quality
- 37
- Riverside15.8 km
United States
- Tree cover
- 22%
- Air quality
- 38
- Moreno Valley25.5 km
United States
- Tree cover
- 6%
- Air quality
- 25
- Corona27.0 km
United States
- Tree cover
- 9%
- Air quality
- 59
- Pomona29.5 km
United States
- Tree cover
- 13%
- Air quality
- 49
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Frequently asked
Questions about Fontana
What is the air quality (AQI) in Fontana right now?
The latest reading for Fontana shows an AQI of 29 (Good), measured Nov 11, 07:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Day Creek Square, 6.2 mi (10 km) away). The main pollutant is NO₂. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Fontana today?
At AQI 29 (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 Fontana been like this week?
Over the last 7 days, the CAMS air-quality model put Fontana's daily AQI at 41 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 Fontana lost since 2001?
There was very little forest around Fontana in 2000, about 62 acres (25 hectares), and about 59 acres (24 hectares) of it has been lost since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here. Comparing satellite maps from 2000 and 2020, the forest around Fontana grew from about 259 acres (105 hectares) to 284 acres (115 hectares), a net gain of about 25 acres (10 hectares) (+9.5%). New forest grew on about 32 acres (13 hectares), while 8 acres (3 hectares) were lost.
What is the tree count in Fontana?
Fontana has an estimated 23,876 trees across the 4.9 sq mi (12.57 km²) measured — 7.6% tree cover, 22 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Fontana need?
Fontana needs roughly 70,372 more trees to close a 22-point shortfall against its 30% tree-cover target — about 1,548 t of extra CO₂ absorbed per year once grown.
How are Fontana's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Fontana, 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 Fontana; the tree count is an estimate derived from that cover.
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