City report · Connecticut, United States
Stamford Air quality today
Air quality in Stamford currently reads AQI 26 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 26
Good
- PM2.5, fine particles (µg/m³)
- 3.4
- tree cover
- 28.3%
- trees in this area
- 87.7K
- more trees needed
- 5.3K
Measured across a 1.2 mi (2 km) radius around Downtown, Stamford, CT, USA (4.9 sq mi), from a satellite image of Sep 8, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Stamford · AQI 26 (Good)
Stamford's tree count comes to 87,662 trees across 4.8 sq mi (12.39 km²) of land, 2 points below the 30% tree-cover level considered healthy for this area, so roughly 5,266 more trees would close the gap.
Air quality detail
Air quality in Stamford today: AQI 26, Good
Main pollutant: Ozone · Observed Nov 11, 10:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Larchmont, NY, 13.8 mi (22.2 km) away · median of 3 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.4
PM10
—
NO₂
30.5
O₃
55.0
SO₂
—
CO
—
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 Stamford's daily AQI at 38 on average, from 18 on Nov 8 to an hourly peak of 84 on Nov 6.
Where Stamford stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Stamford: Below target
28.3% tree cover against a 30% healthy-neighborhood target, across 4.8 sq mi (12.39 km²) of land.
Trees in this area
87,662
Target trees
92,928
More trees needed
5,266
CO₂ if planted / yr
115.9 t
Deforestation · 2001–2025
How much forest has Stamford lost?
Since 2001, the area within 10 km of Stamford has lost about 853 acres (345 hectares) of forest (about 650 football fields): 2.3% of the forest it had in 2000. Most of it (96%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from July 2017 of a 5 × 5 km area about 7 km west of the city center.
- Forest lost since 2001
- 853 acres (345 ha)about 650 football fields
- Share of its forest
- 2.3%of what there was in 2000
- Cleared for good
- 815 acres (330 ha)deforestation: turned into farms, mines or towns
The worst year was 2006, when about 68 acres (27 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 | 16 acres (7 ha) | under 1 ha | 17 acres (7 ha) |
| 2002 | 23 acres (9 ha) | under 1 ha | 25 acres (10 ha) |
| 2003 | 4 acres (2 ha) | under 1 ha | 4 acres (2 ha) |
| 2004 | 26 acres (11 ha) | under 1 ha | 28 acres (11 ha) |
| 2005 | 37 acres (15 ha) | under 1 ha | 39 acres (16 ha) |
| 2006 | 65 acres (26 ha) | 3 acres (1 ha) | 68 acres (27 ha) |
| 2007 | 41 acres (17 ha) | 3 acres (1 ha) | 44 acres (18 ha) |
| 2008 | 32 acres (13 ha) | under 1 ha | 34 acres (14 ha) |
| 2009 | 15 acres (6 ha) | under 1 ha | 15 acres (6 ha) |
| 2010 | 29 acres (12 ha) | under 1 ha | 31 acres (13 ha) |
| 2011 | 19 acres (8 ha) | under 1 ha | 20 acres (8 ha) |
| 2012 | 25 acres (10 ha) | 3 acres (1 ha) | 27 acres (11 ha) |
| 2013 | 17 acres (7 ha) | under 1 ha | 18 acres (7 ha) |
| 2014 | 16 acres (7 ha) | under 1 ha | 17 acres (7 ha) |
| 2015 | 26 acres (10 ha) | under 1 ha | 27 acres (11 ha) |
| 2016 | 35 acres (14 ha) | under 1 ha | 37 acres (15 ha) |
| 2017 | 65 acres (26 ha) | under 1 ha | 66 acres (27 ha) |
| 2018 | 59 acres (24 ha) | under 1 ha | 61 acres (25 ha) |
| 2019 | 53 acres (21 ha) | under 1 ha | 53 acres (22 ha) |
| 2020 | 51 acres (21 ha) | under 1 ha | 52 acres (21 ha) |
| 2021 | 40 acres (16 ha) | under 1 ha | 41 acres (17 ha) |
| 2022 | 40 acres (16 ha) | under 1 ha | 41 acres (17 ha) |
| 2023 | 15 acres (6 ha) | under 1 ha | 15 acres (6 ha) |
| 2024 | 17 acres (7 ha) | under 1 ha | 17 acres (7 ha) |
| 2025 | 51 acres (21 ha) | 7 acres (3 ha) | 58 acres (24 ha) |
What is causing deforestation around Stamford?
- Towns and roadscleared for good96% · 815 acres (330 ha)
- Unknown causescause unknown4.5% · 38 acres (15 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
- 41,200 acres (16,700 ha)
- Forest in 2020
- 41,100 acres (16,600 ha)
- Overall change
- −121 acres (49 ha)less forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Stamford stayed about the same size, at about 41,100 acres (16,600 hectares): new forest grew on about 209 acres (85 hectares), and about 331 acres (134 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 Stamford
Same 2 km radius, same index — so they compare directly.
- Bridgeport32.4 km
United States
- Tree cover
- 14%
- Air quality
- 17
- Yonkers33.1 km
United States
- Tree cover
- 46%
- Air quality
- 23
- The Bronx35.6 km
United States
- Tree cover
- 30%
- Air quality
- 26
- Manhattan46.8 km
United States
- Tree cover
- 40%
- Air quality
- 33
- Queens48.3 km
United States
- Tree cover
- 12%
- Air quality
- 32
- New York54.6 km
United States
- Tree cover
- 15%
- Air quality
- 76
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Frequently asked
Questions about Stamford
What is the air quality (AQI) in Stamford right now?
The latest reading for Stamford shows an AQI of 26 (Good), measured Nov 11, 10:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Larchmont, NY, 13.8 mi (22.2 km) away). The main pollutant is Ozone. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Stamford today?
At AQI 26 (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 Stamford been like this week?
Over the last 7 days, the CAMS air-quality model put Stamford's daily AQI at 38 on average, from 18 on Nov 8 to an hourly peak of 84 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Stamford lost since 2001?
Since 2001, the area within 10 km of Stamford has lost about 853 acres (345 hectares) of forest (about 650 football fields): 2.3% of the forest it had in 2000. Most of it (96%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Stamford stayed about the same size, at about 41,100 acres (16,600 hectares): new forest grew on about 209 acres (85 hectares), and about 331 acres (134 hectares) were lost.
What is the tree count in Stamford?
Stamford has an estimated 87,662 trees across the 4.8 sq mi (12.39 km²) of land measured — 28.3% tree cover, 2 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Stamford need?
Stamford needs roughly 5,266 more trees to close a 2-point shortfall against its 30% tree-cover target — about 115.9 t of extra CO₂ absorbed per year once grown.
How are Stamford'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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