City report · California, United States
Santa Ana Air quality today
Air quality in Santa Ana currently reads AQI 33 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 33
Good
- PM2.5, fine particles (µg/m³)
- 3.2
- tree cover
- 13.4%
- trees in this area
- 42.1K
- more trees needed
- 52.1K
Measured across a 1.2 mi (2 km) radius around Downtown, Santa Ana, 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.
Santa Ana · AQI 33 (Good)
Santa Ana's tree count comes to 42,097 trees across 4.9 sq mi (12.57 km²), 17 points below the 30% tree-cover level considered healthy for this area, so roughly 52,150 more trees would close the gap.
Air quality detail
Air quality in Santa Ana today: AQI 33, Good
Main pollutant: NO₂ · Observed Nov 11, 07:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · East 1st St, 1.6 mi (2.6 km) away · median of 4 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.2
PM10
—
NO₂
66.6
O₃
—
SO₂
—
CO
916.5
Data: OpenAQ · AirGradient, AirNow, East 1st St, Velvet
- 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 Santa Ana's daily AQI at 50 on average, from 41 on Nov 10 to an hourly peak of 78 on Nov 4.
Where Santa Ana stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Santa Ana: Critically low
13.4% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
42,097
Target trees
94,247
More trees needed
52,150
CO₂ if planted / yr
1,147 t
Deforestation · 2001–2025
How much forest has Santa Ana lost?
There was very little forest around Santa Ana in 2000, about 178 acres (72 hectares), and about 39 acres (16 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 2016, when about 16 acres (6 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 | under 1 ha | under 1 ha | under 1 ha |
| 2002 | 6 acres (2 ha) | under 1 ha | 7 acres (3 ha) |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | 12 acres (5 ha) | under 1 ha | 12 acres (5 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 | 16 acres (6 ha) | under 1 ha | 16 acres (6 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 Santa Ana?
- Towns and roadscleared for good92% · 36 acres (15 ha)
- Unknown causescause unknown8.3% · 3 acres (1 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
- 3,270 acres (1,320 ha)
- Forest in 2020
- 3,850 acres (1,560 ha)
- Overall change
- +581 acres (235 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Santa Ana grew from about 3,270 acres (1,320 hectares) to 3,850 acres (1,560 hectares), a net gain of about 581 acres (235 hectares) (+18%). New forest grew on about 618 acres (250 hectares), while 34 acres (14 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 Santa Ana
Same 2 km radius, same index — so they compare directly.
- Huntington Beach15.4 km
United States
- Tree cover
- 9%
- Air quality
- 66
- Long Beach29.8 km
United States
- Tree cover
- 6%
- Air quality
- 75
- Corona31.4 km
United States
- Tree cover
- 9%
- Air quality
- 59
- Downey32.6 km
United States
- Tree cover
- 11%
- Air quality
- 55
- Pomona36.0 km
United States
- Tree cover
- 13%
- Air quality
- 49
- West Covina36.5 km
United States
- Tree cover
- 12%
- Air quality
- 17
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Frequently asked
Questions about Santa Ana
What is the air quality (AQI) in Santa Ana right now?
The latest reading for Santa Ana shows an AQI of 33 (Good), measured Nov 11, 07:00 local time by 4 ground monitoring stations via OpenAQ (the median of their readings; the nearest is East 1st St, 1.6 mi (2.6 km) away). The main pollutant is NO₂. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Santa Ana today?
At AQI 33 (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 Santa Ana been like this week?
Over the last 7 days, the CAMS air-quality model put Santa Ana's daily AQI at 50 on average, from 41 on Nov 10 to an hourly peak of 78 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 Santa Ana lost since 2001?
There was very little forest around Santa Ana in 2000, about 178 acres (72 hectares), and about 39 acres (16 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 Santa Ana grew from about 3,270 acres (1,320 hectares) to 3,850 acres (1,560 hectares), a net gain of about 581 acres (235 hectares) (+18%). New forest grew on about 618 acres (250 hectares), while 34 acres (14 hectares) were lost.
What is the tree count in Santa Ana?
Santa Ana has an estimated 42,097 trees across the 4.9 sq mi (12.57 km²) measured — 13.4% tree cover, 17 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Santa Ana need?
Santa Ana needs roughly 52,150 more trees to close a 17-point shortfall against its 30% tree-cover target — about 1,147 t of extra CO₂ absorbed per year once grown.
How are Santa Ana's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Downtown, 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 Downtown; the tree count is an estimate derived from that cover.
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