City report · California, United States
Santa Rosa Air quality today
Air quality in Santa Rosa currently reads AQI 30 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 30
Good
- PM2.5, fine particles (µg/m³)
- 5.4
- tree cover
- 26.3%
- trees in this area
- 82.6K
- more trees needed
- 11.6K
Measured across a 1.2 mi (2 km) radius around Santa Rosa, CA, USA (4.9 sq mi), from a satellite image of Sep 15, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Santa Rosa · AQI 30 (Good)
Santa Rosa's tree count comes to 82,624 trees across 4.9 sq mi (12.57 km²), 4 points below the 30% tree-cover level considered healthy for this area, so roughly 11,624 more trees would close the gap.
Air quality detail
Air quality in Santa Rosa today: AQI 30, 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 · North Santa Rosa, 3.5 mi (5.6 km) away · median of 2 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
5.4
PM10
—
NO₂
3.0
O₃
15.7
SO₂
—
CO
229.1
Data: OpenAQ · AirGradient, 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 Santa Rosa's daily AQI at 32 on average, from 20 on Nov 8 to an hourly peak of 61 on Nov 4.
Where Santa Rosa stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Santa Rosa: Below target
26.3% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
82,624
Target trees
94,248
More trees needed
11,624
CO₂ if planted / yr
255.7 t
Deforestation · 2001–2025
How much forest has Santa Rosa lost?
Since 2001, the area within 10 km of Santa Rosa has lost about 4,350 acres (1,760 hectares) of forest (about 3,300 football fields): 26% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 635 acres (257 hectares) (15%) was deforestation: forest cleared for good for farms, mines or towns.
2017: satellite photo from August 2017 of a 5 × 5 km area about 7 km north of the city center.
- Forest lost since 2001
- 4,350 acres (1,760 ha)about 3,300 football fields
- Share of its forest
- 26%of what there was in 2000
- Cleared for good
- 635 acres (257 ha)deforestation: turned into farms, mines or towns
Forest loss is slowing down: about 180 acres (73 hectares) a year in 2021–2025, down from 633 acres (256 hectares) a year in 2016–2020. The worst year was 2017, when about 1,930 acres (781 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 | 30 acres (12 ha) | 10 acres (4 ha) | 40 acres (16 ha) |
| 2002 | 29 acres (12 ha) | 31 acres (13 ha) | 60 acres (24 ha) |
| 2003 | 6 acres (2 ha) | 11 acres (5 ha) | 17 acres (7 ha) |
| 2004 | 14 acres (6 ha) | 4 acres (2 ha) | 18 acres (7 ha) |
| 2005 | 6 acres (2 ha) | 14 acres (6 ha) | 20 acres (8 ha) |
| 2006 | 9 acres (4 ha) | 14 acres (6 ha) | 23 acres (9 ha) |
| 2007 | 3 acres (1 ha) | 4 acres (2 ha) | 7 acres (3 ha) |
| 2008 | 4 acres (2 ha) | 11 acres (4 ha) | 15 acres (6 ha) |
| 2009 | 4 acres (2 ha) | 45 acres (18 ha) | 49 acres (20 ha) |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | 3 acres (1 ha) | under 1 ha | 5 acres (2 ha) |
| 2012 | 4 acres (2 ha) | 10 acres (4 ha) | 14 acres (6 ha) |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | 4 acres (2 ha) | 5 acres (2 ha) |
| 2015 | under 1 ha | 4 acres (2 ha) | 6 acres (2 ha) |
| 2016 | under 1 ha | 3 acres (1 ha) | 5 acres (2 ha) |
| 2017 | 257 acres (104 ha) | 1,670 acres (677 ha) | 1,930 acres (781 ha) |
| 2018 | 237 acres (96 ha) | 618 acres (250 ha) | 855 acres (346 ha) |
| 2019 | 4 acres (2 ha) | 26 acres (11 ha) | 30 acres (12 ha) |
| 2020 | 3 acres (1 ha) | 341 acres (138 ha) | 343 acres (139 ha) |
| 2021 | 4 acres (2 ha) | 878 acres (355 ha) | 882 acres (357 ha) |
| 2022 | 3 acres (1 ha) | 4 acres (2 ha) | 8 acres (3 ha) |
| 2023 | 5 acres (2 ha) | under 1 ha | 5 acres (2 ha) |
| 2024 | under 1 ha | under 1 ha | under 1 ha |
| 2025 | under 1 ha | under 1 ha | 3 acres (1 ha) |
What is causing deforestation around Santa Rosa?
- Wildfirescan grow back83% · 3,630 acres (1,470 ha)
- Towns and roadscleared for good13% · 583 acres (236 ha)
- Farms, pasture and plantationscleared for good1.2% · 52 acres (21 ha)
Also: logging, storms, floods and other natural causes, 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
- 29,400 acres (11,900 ha)
- Forest in 2020
- 29,700 acres (12,000 ha)
- Overall change
- +341 acres (138 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Santa Rosa stayed about the same size, at about 29,700 acres (12,000 hectares): new forest grew on about 1,230 acres (496 hectares), and about 885 acres (358 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 Rosa
Same 2 km radius, same index — so they compare directly.
- Vallejo54.7 km
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- Tree cover
- 14%
- Air quality
- 7
- Fairfield62.5 km
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- Tree cover
- 11%
- Air quality
- 8
- Richmond64.6 km
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- Tree cover
- 5%
- Air quality
- 10
- San Francisco78.4 km
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- Tree cover
- 6%
- Air quality
- 51
- Concord78.8 km
United States
- Tree cover
- 22%
- Air quality
- 8
- Oakland80.7 km
United States
- Tree cover
- 7%
- Air quality
- 31
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Frequently asked
Questions about Santa Rosa
What is the air quality (AQI) in Santa Rosa right now?
The latest reading for Santa Rosa shows an AQI of 30 (Good), measured Nov 11, 07:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is North Santa Rosa, 3.5 mi (5.6 km) away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Santa Rosa today?
At AQI 30 (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 Rosa been like this week?
Over the last 7 days, the CAMS air-quality model put Santa Rosa's daily AQI at 32 on average, from 20 on Nov 8 to an hourly peak of 61 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 Rosa lost since 2001?
Since 2001, the area within 10 km of Santa Rosa has lost about 4,350 acres (1,760 hectares) of forest (about 3,300 football fields): 26% of the forest it had in 2000. Most of it was lost to wildfires, so much of it can grow back. About 635 acres (257 hectares) (15%) was deforestation: forest cleared for good for farms, mines or towns. Forest loss is slowing down: about 180 acres (73 hectares) a year in 2021–2025, down from 633 acres (256 hectares) a year in 2016–2020. Comparing satellite maps from 2000 and 2020, the forest around Santa Rosa stayed about the same size, at about 29,700 acres (12,000 hectares): new forest grew on about 1,230 acres (496 hectares), and about 885 acres (358 hectares) were lost.
What is the tree count in Santa Rosa?
Santa Rosa has an estimated 82,624 trees across the 4.9 sq mi (12.57 km²) measured — 26.3% tree cover, 4 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Santa Rosa need?
Santa Rosa needs roughly 11,624 more trees to close a 4-point shortfall against its 30% tree-cover target — about 255.7 t of extra CO₂ absorbed per year once grown.
How are Santa Rosa's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Santa Rosa, 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 Santa Rosa; the tree count is an estimate derived from that cover.
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