City report · California, United States
Sunnyvale Air quality today
Air quality in Sunnyvale currently reads AQI 21 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 21
Good
- PM2.5, fine particles (µg/m³)
- 3.8
- tree cover
- 19.3%
- trees in this area
- 60.6K
- more trees needed
- 33.6K
Measured across a 1.2 mi (2 km) radius around Sunnyvale, CA, USA (4.9 sq mi), from a satellite image of Sep 12, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Sunnyvale · AQI 21 (Good)
Sunnyvale's tree count comes to 60,633 trees across 4.9 sq mi (12.57 km²), 11 points below the 30% tree-cover level considered healthy for this area, so roughly 33,615 more trees would close the gap.
Air quality detail
Air quality in Sunnyvale today: AQI 21, 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 · Blair Ave Apartments, 0.5 mi (800 m) away · median of 12 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.8
PM10
—
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirGradient, Clarity, Terminal Gravity, Arthur R., Gregable, PaloAltoWeather.com
- 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 Sunnyvale's daily AQI at 58 on average, from 39 on Nov 4 to an hourly peak of 81 on Nov 8.
Where Sunnyvale stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Sunnyvale: Below target
19.3% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
60,633
Target trees
94,248
More trees needed
33,615
CO₂ if planted / yr
739.5 t
Deforestation · 2001–2025
How much forest has Sunnyvale lost?
Since 2001, the area within 10 km of Sunnyvale has lost about 169 acres (69 hectares) of forest (about 130 football fields): 2% of the forest it had in 2000. Most of it (81%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 169 acres (69 ha)about 130 football fields
- Share of its forest
- 2%of what there was in 2000
- Cleared for good
- 137 acres (55 ha)deforestation: turned into farms, mines or towns
The worst year was 2006, when about 18 acres (7 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 | 4 acres (2 ha) | 4 acres (2 ha) | 8 acres (3 ha) |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | 10 acres (4 ha) | under 1 ha | 12 acres (5 ha) |
| 2004 | 4 acres (2 ha) | under 1 ha | 4 acres (2 ha) |
| 2005 | 13 acres (5 ha) | 4 acres (2 ha) | 18 acres (7 ha) |
| 2006 | 13 acres (5 ha) | 5 acres (2 ha) | 18 acres (7 ha) |
| 2007 | 13 acres (5 ha) | under 1 ha | 15 acres (6 ha) |
| 2008 | 7 acres (3 ha) | under 1 ha | 9 acres (4 ha) |
| 2009 | 7 acres (3 ha) | under 1 ha | 9 acres (4 ha) |
| 2010 | 7 acres (3 ha) | under 1 ha | 8 acres (3 ha) |
| 2011 | 11 acres (4 ha) | under 1 ha | 12 acres (5 ha) |
| 2012 | 7 acres (3 ha) | under 1 ha | 8 acres (3 ha) |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | 6 acres (3 ha) | 2 acres (1 ha) | 9 acres (4 ha) |
| 2015 | 13 acres (5 ha) | under 1 ha | 14 acres (6 ha) |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | 7 acres (3 ha) | under 1 ha | 8 acres (3 ha) |
| 2018 | 2 acres (1 ha) | under 1 ha | 3 acres (1 ha) |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | 3 acres (1 ha) | under 1 ha | 5 acres (2 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 Sunnyvale?
- Towns and roadscleared for good71% · 119 acres (48 ha)
- Mining and energycleared for good10% · 17 acres (7 ha)
- Storms, floods and other natural causescan grow back3.6% · 6 acres (3 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
- 22,500 acres (9,110 ha)
- Forest in 2020
- 23,900 acres (9,680 ha)
- Overall change
- +1,400 acres (568 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Sunnyvale grew from about 22,500 acres (9,110 hectares) to 23,900 acres (9,680 hectares), a net gain of about 1,400 acres (568 hectares) (+6.2%). New forest grew on about 1,530 acres (621 hectares), while 131 acres (53 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 Sunnyvale
Same 2 km radius, same index — so they compare directly.
- San Jose12.9 km
United States
- Tree cover
- 17%
- Air quality
- 55
- Fremont20.4 km
United States
- Tree cover
- 15%
- Air quality
- 29
- San Mateo33.4 km
United States
- Tree cover
- 30%
- Air quality
- 37
- Hayward33.6 km
United States
- Tree cover
- 20%
- Air quality
- 29
- Oakland52.7 km
United States
- Tree cover
- 7%
- Air quality
- 31
- Daly City53.0 km
United States
- Tree cover
- 17%
- Air quality
- 55
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Frequently asked
Questions about Sunnyvale
What is the air quality (AQI) in Sunnyvale right now?
The latest reading for Sunnyvale shows an AQI of 21 (Good), measured Nov 11, 07:00 local time by 12 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Blair Ave Apartments, 0.5 mi (800 m) away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Sunnyvale today?
At AQI 21 (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 Sunnyvale been like this week?
Over the last 7 days, the CAMS air-quality model put Sunnyvale's daily AQI at 58 on average, from 39 on Nov 4 to an hourly peak of 81 on Nov 8. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Sunnyvale lost since 2001?
Since 2001, the area within 10 km of Sunnyvale has lost about 169 acres (69 hectares) of forest (about 130 football fields): 2% of the forest it had in 2000. Most of it (81%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Sunnyvale grew from about 22,500 acres (9,110 hectares) to 23,900 acres (9,680 hectares), a net gain of about 1,400 acres (568 hectares) (+6.2%). New forest grew on about 1,530 acres (621 hectares), while 131 acres (53 hectares) were lost.
What is the tree count in Sunnyvale?
Sunnyvale has an estimated 60,633 trees across the 4.9 sq mi (12.57 km²) measured — 19.3% tree cover, 11 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Sunnyvale need?
Sunnyvale needs roughly 33,615 more trees to close a 11-point shortfall against its 30% tree-cover target — about 739.5 t of extra CO₂ absorbed per year once grown.
How are Sunnyvale's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Sunnyvale, 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 Sunnyvale; the tree count is an estimate derived from that cover.
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