City report · Wisconsin, United States
Green Bay Air quality today
Air quality in Green Bay currently reads AQI 36 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 36
Good
- PM2.5, fine particles (µg/m³)
- 6.5
- tree cover
- 28.4%
- trees in this area
- 82.9K
- more trees needed
- 4.7K
Measured across a 1.2 mi (2 km) radius around Green Bay, WI, USA (4.9 sq mi), from a satellite image of Sep 1, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Green Bay · AQI 36 (Good)
Green Bay's tree count comes to 82,887 trees across 4.5 sq mi (11.68 km²) of land, 2 points below the 30% tree-cover level considered healthy for this area, so roughly 4,670 more trees would close the gap.
Air quality detail
Air quality in Green Bay today: AQI 36, Good
Main pollutant: PM2.5 · Observed Nov 11, 08:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Green Bay East High, 1.3 mi (2.1 km) away
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.5
PM10
—
NO₂
—
O₃
—
SO₂
—
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 Green Bay's daily AQI at 20 on average, from 5 on Nov 6 to an hourly peak of 55 on Nov 9.
Where Green Bay stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Green Bay: Below target
28.4% tree cover against a 30% healthy-neighborhood target, across 4.5 sq mi (11.68 km²) of land.
Trees in this area
82,887
Target trees
87,557
More trees needed
4,670
CO₂ if planted / yr
102.7 t
Deforestation · 2001–2025
How much forest has Green Bay lost?
Since 2001, the area within 10 km of Green Bay has lost about 229 acres (93 hectares) of forest (about 170 football fields): 2% of the forest it had in 2000. Most of it (62%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from June 2017 of a 5 × 5 km area about 7 km northwest of the city center.
- Forest lost since 2001
- 229 acres (93 ha)about 170 football fields
- Share of its forest
- 2%of what there was in 2000
- Cleared for good
- 142 acres (57 ha)deforestation: turned into farms, mines or towns
The worst year was 2018, when about 57 acres (23 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 | 5 acres (2 ha) |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 6 acres (2 ha) | under 1 ha | 8 acres (3 ha) |
| 2005 | 8 acres (3 ha) | under 1 ha | 9 acres (4 ha) |
| 2006 | under 1 ha | under 1 ha | 4 acres (2 ha) |
| 2007 | 6 acres (3 ha) | 3 acres (1 ha) | 10 acres (4 ha) |
| 2008 | under 1 ha | under 1 ha | 2 acres (1 ha) |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | 2 acres (1 ha) |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | under 1 ha | under 1 ha | 4 acres (2 ha) |
| 2013 | under 1 ha | under 1 ha | under 1 ha |
| 2014 | 4 acres (2 ha) | under 1 ha | 5 acres (2 ha) |
| 2015 | under 1 ha | under 1 ha | 2 acres (1 ha) |
| 2016 | 20 acres (8 ha) | under 1 ha | 20 acres (8 ha) |
| 2017 | 9 acres (4 ha) | under 1 ha | 9 acres (4 ha) |
| 2018 | 32 acres (13 ha) | 25 acres (10 ha) | 57 acres (23 ha) |
| 2019 | 7 acres (3 ha) | 13 acres (5 ha) | 20 acres (8 ha) |
| 2020 | 9 acres (4 ha) | under 1 ha | 10 acres (4 ha) |
| 2021 | 6 acres (3 ha) | under 1 ha | 7 acres (3 ha) |
| 2022 | 7 acres (3 ha) | 16 acres (6 ha) | 22 acres (9 ha) |
| 2023 | 5 acres (2 ha) | under 1 ha | 5 acres (2 ha) |
| 2024 | 2 acres (1 ha) | under 1 ha | 2 acres (1 ha) |
| 2025 | 3 acres (1 ha) | 10 acres (4 ha) | 13 acres (5 ha) |
What is causing deforestation around Green Bay?
- Towns and roadscleared for good62% · 142 acres (58 ha)
- Loggingcan grow back25% · 57 acres (23 ha)
- Unknown causescause unknown12% · 28 acres (11 ha)
Also: storms, floods and other natural 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
- 20,200 acres (8,160 ha)
- Forest in 2020
- 21,800 acres (8,810 ha)
- Overall change
- +1,610 acres (651 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Green Bay grew from about 20,200 acres (8,160 hectares) to 21,800 acres (8,810 hectares), a net gain of about 1,610 acres (651 hectares) (+8%). New forest grew on about 1,880 acres (762 hectares), while 274 acres (111 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 Green Bay
Same 2 km radius, same index — so they compare directly.
- Milwaukee164.9 km
United States
- Tree cover
- 9%
- Air quality
- 68
- Madison195.3 km
United States
- Tree cover
- 31%
- Air quality
- 36
- Kenosha215.7 km
United States
- Tree cover
- 25%
- Air quality
- 61
- Grand Rapids256.1 km
United States
- Tree cover
- 30%
- Air quality
- 72
- Rockford264.6 km
United States
- Tree cover
- 40%
- Air quality
- 79
- Elgin276.8 km
United States
- Tree cover
- 47%
- Air quality
- 69
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Frequently asked
Questions about Green Bay
What is the air quality (AQI) in Green Bay right now?
The latest reading for Green Bay shows an AQI of 36 (Good), measured Nov 11, 08:00 local time by the Green Bay East High ground monitoring station, 1.3 mi (2.1 km) away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Green Bay today?
At AQI 36 (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 Green Bay been like this week?
Over the last 7 days, the CAMS air-quality model put Green Bay's daily AQI at 20 on average, from 5 on Nov 6 to an hourly peak of 55 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 Green Bay lost since 2001?
Since 2001, the area within 10 km of Green Bay has lost about 229 acres (93 hectares) of forest (about 170 football fields): 2% of the forest it had in 2000. Most of it (62%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Green Bay grew from about 20,200 acres (8,160 hectares) to 21,800 acres (8,810 hectares), a net gain of about 1,610 acres (651 hectares) (+8%). New forest grew on about 1,880 acres (762 hectares), while 274 acres (111 hectares) were lost.
What is the tree count in Green Bay?
Green Bay has an estimated 82,887 trees across the 4.5 sq mi (11.68 km²) of land measured — 28.4% tree cover, 2 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Green Bay need?
Green Bay needs roughly 4,670 more trees to close a 2-point shortfall against its 30% tree-cover target — about 102.7 t of extra CO₂ absorbed per year once grown.
How are Green Bay's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Green Bay, 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 Green Bay; the tree count is an estimate derived from that cover.
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