City report · Michigan, United States
Warren Air quality today
Air quality in Warren currently reads AQI 58 (Moderate): Unusually sensitive people should consider limiting long outdoor exertion.
Air quality right now
AQI 58
Moderate
- PM2.5, fine particles (µg/m³)
- 12.9
- tree cover
- 25.0%
- trees in this area
- 78.0K
- more trees needed
- 15.6K
Measured across a 1.2 mi (2 km) radius around Warren, 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.
Warren · AQI 58 (Moderate)
Warren's tree count comes to 77,990 trees across 4.8 sq mi (12.48 km²) of land, 5 points below the 30% tree-cover level considered healthy for this area, so roughly 15,598 more trees would close the gap.
Air quality detail
Air quality in Warren today: AQI 58, Moderate
Main pollutant: PM2.5 · Observed Nov 11, 10:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Detroit-E7 Mile, 4.2 mi (6.7 km) away
Health signal
Unusually sensitive people should consider limiting long outdoor exertion.
PM2.5
12.9
PM10
—
NO₂
52.9
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirNow
- Outdoor exercise
- Fine for most people; unusually sensitive people should take long or hard exercise easier
- Windows
- Fine to open; close them if you are sensitive to pollution
- Mask
- Not needed for most people
- Air purifier
- Worth running if you are sensitive
Over the last 7 days, the CAMS air-quality model put Warren's daily AQI at 31 on average, from 18 on Nov 6 to an hourly peak of 65 on Nov 9.
Where Warren stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Warren: Below target
25.0% tree cover against a 30% healthy-neighborhood target, across 4.8 sq mi (12.48 km²) of land.
Trees in this area
77,990
Target trees
93,588
More trees needed
15,598
CO₂ if planted / yr
343.2 t
Deforestation · 2001–2025
How much forest has Warren lost?
Since 2001, the area within 10 km of Warren has lost about 94 acres (38 hectares) of forest (about 71 football fields): 4.8% of the forest it had in 2000. Most of it (84%) 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
- 94 acres (38 ha)about 71 football fields
- Share of its forest
- 4.8%of what there was in 2000
- Cleared for good
- 79 acres (32 ha)deforestation: turned into farms, mines or towns
The worst year was 2005, 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 | 5 acres (2 ha) | 6 acres (2 ha) | 11 acres (5 ha) |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | 3 acres (1 ha) | under 1 ha | 3 acres (1 ha) |
| 2004 | 7 acres (3 ha) | under 1 ha | 8 acres (3 ha) |
| 2005 | 16 acres (7 ha) | under 1 ha | 18 acres (7 ha) |
| 2006 | under 1 ha | under 1 ha | 3 acres (1 ha) |
| 2007 | under 1 ha | under 1 ha | under 1 ha |
| 2008 | under 1 ha | under 1 ha | under 1 ha |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | under 1 ha |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | under 1 ha | under 1 ha | under 1 ha |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | under 1 ha | under 1 ha | under 1 ha |
| 2015 | 4 acres (2 ha) | under 1 ha | 4 acres (2 ha) |
| 2016 | 5 acres (2 ha) | under 1 ha | 5 acres (2 ha) |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | 9 acres (4 ha) | under 1 ha | 10 acres (4 ha) |
| 2019 | 11 acres (5 ha) | under 1 ha | 11 acres (5 ha) |
| 2020 | 6 acres (2 ha) | under 1 ha | 6 acres (2 ha) |
| 2021 | 3 acres (1 ha) | under 1 ha | 3 acres (1 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 Warren?
- Towns and roadscleared for good84% · 79 acres (32 ha)
- Unknown causescause unknown16% · 15 acres (6 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
- 27,500 acres (11,100 ha)
- Forest in 2020
- 28,600 acres (11,600 ha)
- Overall change
- +1,110 acres (451 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Warren grew from about 27,500 acres (11,100 hectares) to 28,600 acres (11,600 hectares), a net gain of about 1,110 acres (451 hectares) (+4.1%). New forest grew on about 1,220 acres (494 hectares), while 108 acres (44 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 Warren
Same 2 km radius, same index — so they compare directly.
- Clinton Township13.2 km
United States
- Tree cover
- 43%
- Air quality
- 51
- Detroit17.9 km
United States
- Tree cover
- 11%
- Air quality
- 91
- Windsor21.2 km
Canada
- Tree cover
- 26%
- Air quality
- 70
- Ann Arbor64.3 km
United States
- Tree cover
- 55%
- Air quality
- 43
- Toledo102.2 km
United States
- Tree cover
- 35%
- Air quality
- 61
- Lansing129.1 km
United States
- Tree cover
- 33%
- Air quality
- 53
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Frequently asked
Questions about Warren
What is the air quality (AQI) in Warren right now?
The latest reading for Warren shows an AQI of 58 (Moderate), measured Nov 11, 10:00 local time by the Detroit-E7 Mile ground monitoring station, 4.2 mi (6.7 km) away, via OpenAQ. The main pollutant is PM2.5. Unusually sensitive people should consider limiting long outdoor exertion.
Is it safe to exercise outside in Warren today?
At AQI 58 (Moderate): fine for most people; unusually sensitive people should take long or hard exercise easier. Windows: fine to open; close them if you are sensitive to pollution. Masks: not needed for most people. The reading changes through the day, so check again before a long run or ride.
What has the air quality in Warren been like this week?
Over the last 7 days, the CAMS air-quality model put Warren's daily AQI at 31 on average, from 18 on Nov 6 to an hourly peak of 65 on Nov 9. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Warren lost since 2001?
Since 2001, the area within 10 km of Warren has lost about 94 acres (38 hectares) of forest (about 71 football fields): 4.8% of the forest it had in 2000. Most of it (84%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Warren grew from about 27,500 acres (11,100 hectares) to 28,600 acres (11,600 hectares), a net gain of about 1,110 acres (451 hectares) (+4.1%). New forest grew on about 1,220 acres (494 hectares), while 108 acres (44 hectares) were lost.
What is the tree count in Warren?
Warren has an estimated 77,990 trees across the 4.8 sq mi (12.48 km²) of land measured — 25.0% tree cover, 5 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Warren need?
Warren needs roughly 15,598 more trees to close a 5-point shortfall against its 30% tree-cover target — about 343.2 t of extra CO₂ absorbed per year once grown.
How are Warren's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Warren, 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 Warren; the tree count is an estimate derived from that cover.
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