City report · Michigan, United States
Ann Arbor Air quality today
Air quality in Ann Arbor currently reads AQI 43 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 43
Good
- PM2.5, fine particles (µg/m³)
- 7.8
- tree cover
- 55.2%
- trees in this area
- 173K
- more trees needed
- 0
Measured across a 1.2 mi (2 km) radius around Ann Arbor, MI, USA (4.9 sq mi), from a satellite image of Aug 28, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Ann Arbor · AQI 43 (Good)
Ann Arbor's tree count comes to 172,722 trees across 4.8 sq mi (12.52 km²) of land, already at or above the 30% tree-cover level considered healthy for this area.
Air quality detail
Air quality in Ann Arbor today: AQI 43, Good
Main pollutant: PM2.5 · Observed Nov 11, 10:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Ann Arbor City Hall, 0.4 mi (600 m) away · median of 15 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
7.8
PM10
—
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirGradient, Clarity, Espy Cafe, Luke Tracy, sadieToast, Westbrook
- 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 Ann Arbor's daily AQI at 20 on average, from 12 on Nov 6 to an hourly peak of 54 on Nov 7.
Where Ann Arbor stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Ann Arbor: Healthy tree cover
55.2% tree cover against a 30% healthy-neighborhood target, across 4.8 sq mi (12.52 km²) of land.
Trees in this area
172,722
Target trees
172,722
More trees needed
0
CO₂ if planted / yr
0 kg
Deforestation · 2001–2025
How much forest has Ann Arbor lost?
Since 2001, the area within 10 km of Ann Arbor has lost about 366 acres (148 hectares) of forest (about 280 football fields): 1.6% of the forest it had in 2000. Most of it (86%) 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 east of the city center.
- Forest lost since 2001
- 366 acres (148 ha)about 280 football fields
- Share of its forest
- 1.6%of what there was in 2000
- Cleared for good
- 315 acres (128 ha)deforestation: turned into farms, mines or towns
The worst year was 2017, when about 52 acres (21 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 | 12 acres (5 ha) | 3 acres (1 ha) | 16 acres (6 ha) |
| 2002 | 12 acres (5 ha) | under 1 ha | 15 acres (6 ha) |
| 2003 | 9 acres (4 ha) | under 1 ha | 11 acres (5 ha) |
| 2004 | 3 acres (1 ha) | under 1 ha | 4 acres (2 ha) |
| 2005 | 21 acres (9 ha) | under 1 ha | 23 acres (9 ha) |
| 2006 | under 1 ha | under 1 ha | under 1 ha |
| 2007 | 5 acres (2 ha) | 3 acres (1 ha) | 8 acres (3 ha) |
| 2008 | under 1 ha | 2 acres (1 ha) | 4 acres (2 ha) |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | 7 acres (3 ha) | under 1 ha | 8 acres (3 ha) |
| 2012 | 12 acres (5 ha) | under 1 ha | 13 acres (5 ha) |
| 2013 | 11 acres (4 ha) | under 1 ha | 13 acres (5 ha) |
| 2014 | 2 acres (1 ha) | under 1 ha | 3 acres (1 ha) |
| 2015 | under 1 ha | under 1 ha | 2 acres (1 ha) |
| 2016 | 8 acres (3 ha) | 6 acres (3 ha) | 15 acres (6 ha) |
| 2017 | 49 acres (20 ha) | under 1 ha | 52 acres (21 ha) |
| 2018 | 23 acres (9 ha) | under 1 ha | 25 acres (10 ha) |
| 2019 | 5 acres (2 ha) | 3 acres (1 ha) | 9 acres (4 ha) |
| 2020 | 43 acres (17 ha) | 2 acres (1 ha) | 45 acres (18 ha) |
| 2021 | 4 acres (2 ha) | 6 acres (3 ha) | 11 acres (4 ha) |
| 2022 | 42 acres (17 ha) | under 1 ha | 43 acres (17 ha) |
| 2023 | 23 acres (9 ha) | under 1 ha | 23 acres (9 ha) |
| 2024 | 9 acres (4 ha) | under 1 ha | 9 acres (4 ha) |
| 2025 | 6 acres (3 ha) | 6 acres (3 ha) | 13 acres (5 ha) |
What is causing deforestation around Ann Arbor?
- Towns and roadscleared for good77% · 282 acres (114 ha)
- Farms, pasture and plantationscleared for good8.8% · 32 acres (13 ha)
- Loggingcan grow back2.3% · 8 acres (3 ha)
Also: mining and energy, 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
- 33,700 acres (13,600 ha)
- Forest in 2020
- 37,900 acres (15,300 ha)
- Overall change
- +4,160 acres (1,680 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Ann Arbor grew from about 33,700 acres (13,600 hectares) to 37,900 acres (15,300 hectares), a net gain of about 4,160 acres (1,680 hectares) (+12%). New forest grew on about 4,540 acres (1,840 hectares), while 378 acres (153 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 Ann Arbor
Same 2 km radius, same index — so they compare directly.
- Detroit57.5 km
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- 11%
- Air quality
- 91
- Windsor59.6 km
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- Air quality
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- Warren64.3 km
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- 25%
- Air quality
- 58
- Sterling Heights67.3 km
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- Tree cover
- 18%
- Air quality
- 51
- Toledo69.9 km
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- Tree cover
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- Air quality
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- Clinton Township75.7 km
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- Tree cover
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- Air quality
- 51
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Frequently asked
Questions about Ann Arbor
What is the air quality (AQI) in Ann Arbor right now?
The latest reading for Ann Arbor shows an AQI of 43 (Good), measured Nov 11, 10:00 local time by 15 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Ann Arbor City Hall, 0.4 mi (600 m) away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Ann Arbor today?
At AQI 43 (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 Ann Arbor been like this week?
Over the last 7 days, the CAMS air-quality model put Ann Arbor's daily AQI at 20 on average, from 12 on Nov 6 to an hourly peak of 54 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 Ann Arbor lost since 2001?
Since 2001, the area within 10 km of Ann Arbor has lost about 366 acres (148 hectares) of forest (about 280 football fields): 1.6% of the forest it had in 2000. Most of it (86%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Ann Arbor grew from about 33,700 acres (13,600 hectares) to 37,900 acres (15,300 hectares), a net gain of about 4,160 acres (1,680 hectares) (+12%). New forest grew on about 4,540 acres (1,840 hectares), while 378 acres (153 hectares) were lost.
What is the tree count in Ann Arbor?
Ann Arbor has an estimated 172,722 trees across the 4.8 sq mi (12.52 km²) of land measured — 55.2% tree cover, already past the 30% tree-cover target set for this area.
How many more trees does Ann Arbor need?
Ann Arbor has already reached its tree-cover target, so no additional trees are needed to close the gap.
How are Ann Arbor's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Ann Arbor, 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 Ann Arbor; the tree count is an estimate derived from that cover.
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