City report · Connecticut, United States
New Haven Air quality today
Air quality in New Haven currently reads AQI 24 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 24
Good
- PM2.5, fine particles (µg/m³)
- 4.3
- tree cover
- 30.3%
- trees in this area
- 93.0K
- more trees needed
- 0
Measured across a 1.2 mi (2 km) radius around Downtown, New Haven, 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.
New Haven · AQI 24 (Good)
New Haven's tree count comes to 93,001 trees across 4.7 sq mi (12.28 km²) of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in New Haven today: AQI 24, Good
Main pollutant: PM2.5 · Observed Nov 11, 09:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · New Haven, 1.4 mi (2.3 km) away
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.3
PM10
13.0
NO₂
36.3
O₃
29.4
SO₂
1.6
CO
—
Data: OpenAQ · 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 New Haven's daily AQI at 32 on average, from 16 on Nov 8 to an hourly peak of 71 on Nov 7.
Where New Haven stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in New Haven: Healthy tree cover
30.3% tree cover against a 30% healthy-neighborhood target, across 4.7 sq mi (12.28 km²) of land.
Trees in this area
93,001
Target trees
93,001
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has New Haven lost?
Since 2001, the area within 10 km of New Haven has lost about 550 acres (223 hectares) of forest (about 420 football fields): 1.5% of the forest it had in 2000. Most of it (82%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from June 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 550 acres (223 ha)about 420 football fields
- Share of its forest
- 1.5%of what there was in 2000
- Cleared for good
- 449 acres (182 ha)deforestation: turned into farms, mines or towns
The worst year was 2018, when about 59 acres (24 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) | under 1 ha | 6 acres (2 ha) |
| 2002 | 16 acres (6 ha) | 4 acres (2 ha) | 20 acres (8 ha) |
| 2003 | 18 acres (7 ha) | under 1 ha | 19 acres (8 ha) |
| 2004 | 32 acres (13 ha) | 4 acres (2 ha) | 36 acres (15 ha) |
| 2005 | 22 acres (9 ha) | 8 acres (3 ha) | 29 acres (12 ha) |
| 2006 | 18 acres (7 ha) | 4 acres (2 ha) | 22 acres (9 ha) |
| 2007 | 12 acres (5 ha) | 7 acres (3 ha) | 19 acres (8 ha) |
| 2008 | 23 acres (9 ha) | 3 acres (1 ha) | 26 acres (11 ha) |
| 2009 | 17 acres (7 ha) | 5 acres (2 ha) | 22 acres (9 ha) |
| 2010 | 17 acres (7 ha) | under 1 ha | 19 acres (8 ha) |
| 2011 | 2 acres (1 ha) | under 1 ha | 3 acres (1 ha) |
| 2012 | 11 acres (5 ha) | under 1 ha | 13 acres (5 ha) |
| 2013 | 13 acres (5 ha) | 7 acres (3 ha) | 20 acres (8 ha) |
| 2014 | 5 acres (2 ha) | 8 acres (3 ha) | 13 acres (5 ha) |
| 2015 | 18 acres (7 ha) | under 1 ha | 19 acres (8 ha) |
| 2016 | 12 acres (5 ha) | 3 acres (1 ha) | 15 acres (6 ha) |
| 2017 | 39 acres (16 ha) | 3 acres (1 ha) | 42 acres (17 ha) |
| 2018 | 47 acres (19 ha) | 12 acres (5 ha) | 59 acres (24 ha) |
| 2019 | 31 acres (13 ha) | under 1 ha | 33 acres (13 ha) |
| 2020 | 15 acres (6 ha) | 2 acres (1 ha) | 18 acres (7 ha) |
| 2021 | 30 acres (12 ha) | 3 acres (1 ha) | 33 acres (13 ha) |
| 2022 | 16 acres (6 ha) | 5 acres (2 ha) | 21 acres (8 ha) |
| 2023 | 11 acres (5 ha) | under 1 ha | 11 acres (5 ha) |
| 2024 | 17 acres (7 ha) | under 1 ha | 18 acres (7 ha) |
| 2025 | 3 acres (1 ha) | 10 acres (4 ha) | 14 acres (6 ha) |
What is causing deforestation around New Haven?
- Towns and roadscleared for good82% · 450 acres (182 ha)
- Loggingcan grow back8.6% · 47 acres (19 ha)
- Unknown causescause unknown9.7% · 53 acres (22 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
- 41,800 acres (16,900 ha)
- Forest in 2020
- 42,200 acres (17,100 ha)
- Overall change
- +427 acres (173 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around New Haven stayed about the same size, at about 42,200 acres (17,100 hectares): new forest grew on about 939 acres (380 hectares), and about 512 acres (207 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 New Haven
Same 2 km radius, same index — so they compare directly.
- Bridgeport26.1 km
United States
- Tree cover
- 14%
- Air quality
- 17
- Waterbury29.6 km
United States
- Tree cover
- 52%
- Air quality
- 77
- Hartford54.6 km
United States
- Tree cover
- 30%
- Air quality
- 19
- North Stamford54.8 km
United States
- Tree cover
- 91%
- Air quality
- 23
- Stamford58.4 km
United States
- Tree cover
- 28%
- Air quality
- 26
- Yonkers91.4 km
United States
- Tree cover
- 46%
- Air quality
- 23
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Frequently asked
Questions about New Haven
What is the air quality (AQI) in New Haven right now?
The latest reading for New Haven shows an AQI of 24 (Good), measured Nov 11, 09:00 local time by the New Haven ground monitoring station, 1.4 mi (2.3 km) away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in New Haven today?
At AQI 24 (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 New Haven been like this week?
Over the last 7 days, the CAMS air-quality model put New Haven's daily AQI at 32 on average, from 16 on Nov 8 to an hourly peak of 71 on Nov 7. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around New Haven lost since 2001?
Since 2001, the area within 10 km of New Haven has lost about 550 acres (223 hectares) of forest (about 420 football fields): 1.5% of the forest it had in 2000. Most of it (82%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around New Haven stayed about the same size, at about 42,200 acres (17,100 hectares): new forest grew on about 939 acres (380 hectares), and about 512 acres (207 hectares) were lost.
What is the tree count in New Haven?
New Haven has an estimated 93,001 trees across the 4.7 sq mi (12.28 km²) of land measured — 30.3% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does New Haven need?
New Haven has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are New Haven'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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