City report · Connecticut, United States
Hartford Air quality today
Air quality in Hartford currently reads AQI 19 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 19
Good
- PM2.5, fine particles (µg/m³)
- 3.4
- tree cover
- 30.0%
- trees in this area
- 90.9K
- more trees needed
- 0
Measured across a 1.2 mi (2 km) radius around Downtown, Hartford, 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.
Hartford · AQI 19 (Good)
Hartford's tree count comes to 90,949 trees across 4.7 sq mi (12.13 km²) of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Hartford today: AQI 19, 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 · Hartford, 0.6 mi (1 km) away · median of 2 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.4
PM10
9.0
NO₂
19.8
O₃
29.4
SO₂
—
CO
916.5
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 Hartford's daily AQI at 36 on average, from 17 on Nov 8 to an hourly peak of 87 on Nov 7.
Where Hartford stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Hartford: Healthy tree cover
30.0% tree cover against a 30% healthy-neighborhood target, across 4.7 sq mi (12.13 km²) of land.
Trees in this area
90,949
Target trees
90,949
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Hartford lost?
Since 2001, the area within 10 km of Hartford has lost about 574 acres (232 hectares) of forest (about 430 football fields): 1.5% of the forest it had in 2000. Most of it (88%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from August 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 574 acres (232 ha)about 430 football fields
- Share of its forest
- 1.5%of what there was in 2000
- Cleared for good
- 508 acres (205 ha)deforestation: turned into farms, mines or towns
The worst year was 2010, when about 49 acres (20 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 | 8 acres (3 ha) | 7 acres (3 ha) | 15 acres (6 ha) |
| 2002 | 34 acres (14 ha) | 3 acres (1 ha) | 38 acres (15 ha) |
| 2003 | 9 acres (4 ha) | under 1 ha | 10 acres (4 ha) |
| 2004 | 14 acres (6 ha) | under 1 ha | 16 acres (6 ha) |
| 2005 | 31 acres (12 ha) | 3 acres (1 ha) | 34 acres (14 ha) |
| 2006 | 10 acres (4 ha) | under 1 ha | 12 acres (5 ha) |
| 2007 | 18 acres (7 ha) | 5 acres (2 ha) | 23 acres (9 ha) |
| 2008 | 32 acres (13 ha) | under 1 ha | 34 acres (14 ha) |
| 2009 | 9 acres (4 ha) | under 1 ha | 11 acres (4 ha) |
| 2010 | 43 acres (18 ha) | 6 acres (2 ha) | 49 acres (20 ha) |
| 2011 | 4 acres (2 ha) | under 1 ha | 4 acres (2 ha) |
| 2012 | 19 acres (8 ha) | 5 acres (2 ha) | 24 acres (10 ha) |
| 2013 | 9 acres (4 ha) | under 1 ha | 11 acres (4 ha) |
| 2014 | 29 acres (12 ha) | under 1 ha | 31 acres (13 ha) |
| 2015 | 25 acres (10 ha) | under 1 ha | 27 acres (11 ha) |
| 2016 | 5 acres (2 ha) | under 1 ha | 7 acres (3 ha) |
| 2017 | 16 acres (7 ha) | under 1 ha | 18 acres (7 ha) |
| 2018 | 20 acres (8 ha) | under 1 ha | 21 acres (9 ha) |
| 2019 | 40 acres (16 ha) | 5 acres (2 ha) | 46 acres (18 ha) |
| 2020 | 32 acres (13 ha) | 4 acres (2 ha) | 36 acres (15 ha) |
| 2021 | 14 acres (6 ha) | under 1 ha | 15 acres (6 ha) |
| 2022 | 32 acres (13 ha) | under 1 ha | 33 acres (14 ha) |
| 2023 | 26 acres (10 ha) | under 1 ha | 27 acres (11 ha) |
| 2024 | 17 acres (7 ha) | under 1 ha | 17 acres (7 ha) |
| 2025 | 11 acres (4 ha) | 4 acres (2 ha) | 15 acres (6 ha) |
What is causing deforestation around Hartford?
- Towns and roadscleared for good84% · 484 acres (196 ha)
- Farms, pasture and plantationscleared for good4.1% · 24 acres (10 ha)
- Loggingcan grow back2.2% · 12 acres (5 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
- 44,800 acres (18,100 ha)
- Forest in 2020
- 45,200 acres (18,300 ha)
- Overall change
- +361 acres (146 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Hartford stayed about the same size, at about 45,200 acres (18,300 hectares): new forest grew on about 996 acres (403 hectares), and about 635 acres (257 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 Hartford
Same 2 km radius, same index — so they compare directly.
- Waterbury38.1 km
United States
- Tree cover
- 52%
- Air quality
- 77
- Springfield38.4 km
United States
- Tree cover
- 31%
- Air quality
- 12
- New Haven54.6 km
United States
- Tree cover
- 30%
- Air quality
- 24
- Bridgeport77.4 km
United States
- Tree cover
- 14%
- Air quality
- 17
- Worcester91.6 km
United States
- Tree cover
- 27%
- Air quality
- 21
- North Stamford99.8 km
United States
- Tree cover
- 91%
- Air quality
- 23
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Frequently asked
Questions about Hartford
What is the air quality (AQI) in Hartford right now?
The latest reading for Hartford shows an AQI of 19 (Good), measured Nov 11, 09:00 local time by 2 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Hartford, 0.6 mi (1 km) away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Hartford today?
At AQI 19 (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 Hartford been like this week?
Over the last 7 days, the CAMS air-quality model put Hartford's daily AQI at 36 on average, from 17 on Nov 8 to an hourly peak of 87 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 Hartford lost since 2001?
Since 2001, the area within 10 km of Hartford has lost about 574 acres (232 hectares) of forest (about 430 football fields): 1.5% of the forest it had in 2000. Most of it (88%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Hartford stayed about the same size, at about 45,200 acres (18,300 hectares): new forest grew on about 996 acres (403 hectares), and about 635 acres (257 hectares) were lost.
What is the tree count in Hartford?
Hartford has an estimated 90,949 trees across the 4.7 sq mi (12.13 km²) of land measured — 30.0% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Hartford need?
Hartford has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Hartford'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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