City report · California, United States
Rancho Cucamonga Air quality today
Air quality in Rancho Cucamonga currently reads AQI 37 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 37
Good
- PM2.5, fine particles (µg/m³)
- 3.2
- tree cover
- 12.9%
- trees in this area
- 40.5K
- more trees needed
- 53.7K
Measured across a 1.2 mi (2 km) radius around Rancho Cucamonga, 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.
Rancho Cucamonga · AQI 37 (Good)
Rancho Cucamonga's tree count comes to 40,527 trees across 4.9 sq mi (12.57 km²), 17 points below the 30% tree-cover level considered healthy for this area, so roughly 53,721 more trees would close the gap.
Air quality detail
Air quality in Rancho Cucamonga today: AQI 37, 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, 3.2 mi (5.2 km) away · median of 5 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.2
PM10
—
NO₂
74.9
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 Rancho Cucamonga's daily AQI at 42 on average, from 30 on Nov 6 to an hourly peak of 88 on Nov 4.
Where Rancho Cucamonga stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Rancho Cucamonga: Critically low
12.9% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
40,527
Target trees
94,248
More trees needed
53,721
CO₂ if planted / yr
1,182 t
Deforestation · 2001–2025
How much forest has Rancho Cucamonga lost?
Since 2001, the area within 10 km of Rancho Cucamonga has lost about 1,550 acres (628 hectares) of forest (about 1,200 football fields): 58% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 19 acres (8 hectares) (1.2%) 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
- 1,550 acres (628 ha)about 1,200 football fields
- Share of its forest
- 58%of what there was in 2000
- Cleared for good
- 19 acres (8 ha)deforestation: turned into farms, mines or towns
The worst year was 2003, when about 1,130 acres (457 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 | 7 acres (3 ha) | 7 acres (3 ha) |
| 2002 | 2 acres (1 ha) | under 1 ha | 3 acres (1 ha) |
| 2003 | 11 acres (4 ha) | 1,120 acres (453 ha) | 1,130 acres (457 ha) |
| 2004 | under 1 ha | 401 acres (162 ha) | 403 acres (163 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 | 3 acres (1 ha) | 3 acres (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 Rancho Cucamonga?
- Wildfirescan grow back99% · 1,530 acres (619 ha)
- Towns and roadscleared for good1.2% · 19 acres (8 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
- 6,820 acres (2,760 ha)
- Forest in 2020
- 6,840 acres (2,770 ha)
- Overall change
- +25 acres (10 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Rancho Cucamonga stayed about the same size, at about 6,840 acres (2,770 hectares): new forest grew on about 115 acres (47 hectares), and about 91 acres (37 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 Rancho Cucamonga
Same 2 km radius, same index — so they compare directly.
- Fontana14.6 km
United States
- Tree cover
- 8%
- Air quality
- 29
- Pomona15.7 km
United States
- Tree cover
- 13%
- Air quality
- 49
- Riverside24.9 km
United States
- Tree cover
- 22%
- Air quality
- 38
- Corona25.8 km
United States
- Tree cover
- 9%
- Air quality
- 59
- San Bernardino27.9 km
United States
- Tree cover
- 6%
- Air quality
- 35
- West Covina32.1 km
United States
- Tree cover
- 12%
- Air quality
- 17
Build your own
Compare Rancho Cucamonga with anywhere
This place
Rancho Cucamonga
Use this data
Put Rancho Cucamonga's numbers on your site
Free to embed. Updates itself as the measurement refreshes.
Frequently asked
Questions about Rancho Cucamonga
What is the air quality (AQI) in Rancho Cucamonga right now?
The latest reading for Rancho Cucamonga shows an AQI of 37 (Good), measured Nov 11, 07:00 local time by 5 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Day Creek Square, 3.2 mi (5.2 km) away). The main pollutant is NO₂. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Rancho Cucamonga today?
At AQI 37 (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 Rancho Cucamonga been like this week?
Over the last 7 days, the CAMS air-quality model put Rancho Cucamonga's daily AQI at 42 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 Rancho Cucamonga lost since 2001?
Since 2001, the area within 10 km of Rancho Cucamonga has lost about 1,550 acres (628 hectares) of forest (about 1,200 football fields): 58% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 19 acres (8 hectares) (1.2%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Rancho Cucamonga stayed about the same size, at about 6,840 acres (2,770 hectares): new forest grew on about 115 acres (47 hectares), and about 91 acres (37 hectares) were lost.
What is the tree count in Rancho Cucamonga?
Rancho Cucamonga has an estimated 40,527 trees across the 4.9 sq mi (12.57 km²) measured — 12.9% tree cover, 17 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Rancho Cucamonga need?
Rancho Cucamonga needs roughly 53,721 more trees to close a 17-point shortfall against its 30% tree-cover target — about 1,182 t of extra CO₂ absorbed per year once grown.
How are Rancho Cucamonga's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Rancho Cucamonga, 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 Rancho Cucamonga; the tree count is an estimate derived from that cover.
See your own area
What does your neighborhood look like?
Pick any point and radius to get the same air-quality and tree-cover breakdown.
Check my address