City report · Minnesota, United States
Saint Paul Air quality today
Air quality in Saint Paul currently reads AQI 25 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 25
Good
- PM2.5, fine particles (µg/m³)
- 4.5
- tree cover
- 27.0%
- trees in this area
- 79.9K
- more trees needed
- 8.9K
Measured across a 1.2 mi (2 km) radius around Core, St Paul, MN, USA (4.9 sq mi), from a satellite image of Sep 10, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Saint Paul · AQI 25 (Good)
Saint Paul's tree count comes to 79,903 trees across 4.6 sq mi (11.84 km²) of land, 3 points below the 30% tree-cover level considered healthy for this area, so roughly 8,878 more trees would close the gap.
Air quality detail
Air quality in Saint Paul today: AQI 25, 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 · St. Paul-Harding H.S, 3.0 mi (4.8 km) away
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.5
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 Saint Paul's daily AQI at 31 on average, from 14 on Nov 5 to an hourly peak of 77 on Nov 6.
Where Saint Paul stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Saint Paul: Below target
27.0% tree cover against a 30% healthy-neighborhood target, across 4.6 sq mi (11.84 km²) of land.
Trees in this area
79,903
Target trees
88,781
More trees needed
8,878
CO₂ if planted / yr
195.3 t
Deforestation · 2001–2025
How much forest has Saint Paul lost?
Since 2001, the area within 10 km of Saint Paul has lost about 330 acres (134 hectares) of forest (about 250 football fields): 2.2% 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 September 2017 of a 5 × 5 km area in the city center.
- Forest lost since 2001
- 330 acres (134 ha)about 250 football fields
- Share of its forest
- 2.2%of what there was in 2000
- Cleared for good
- 285 acres (115 ha)deforestation: turned into farms, mines or towns
The worst year was 2014, when about 80 acres (32 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) | under 1 ha | 6 acres (3 ha) |
| 2002 | 5 acres (2 ha) | under 1 ha | 6 acres (3 ha) |
| 2003 | 8 acres (3 ha) | under 1 ha | 10 acres (4 ha) |
| 2004 | 5 acres (2 ha) | 2 acres (1 ha) | 8 acres (3 ha) |
| 2005 | 8 acres (3 ha) | under 1 ha | 9 acres (4 ha) |
| 2006 | 8 acres (3 ha) | under 1 ha | 8 acres (3 ha) |
| 2007 | 12 acres (5 ha) | under 1 ha | 13 acres (5 ha) |
| 2008 | 5 acres (2 ha) | under 1 ha | 7 acres (3 ha) |
| 2009 | under 1 ha | under 1 ha | under 1 ha |
| 2010 | under 1 ha | under 1 ha | 2 acres (1 ha) |
| 2011 | 4 acres (2 ha) | 2 acres (1 ha) | 6 acres (3 ha) |
| 2012 | 7 acres (3 ha) | 2 acres (1 ha) | 9 acres (4 ha) |
| 2013 | 6 acres (3 ha) | under 1 ha | 7 acres (3 ha) |
| 2014 | 63 acres (25 ha) | 17 acres (7 ha) | 80 acres (32 ha) |
| 2015 | 18 acres (7 ha) | under 1 ha | 19 acres (8 ha) |
| 2016 | 22 acres (9 ha) | under 1 ha | 22 acres (9 ha) |
| 2017 | 14 acres (6 ha) | under 1 ha | 14 acres (6 ha) |
| 2018 | 24 acres (10 ha) | under 1 ha | 26 acres (10 ha) |
| 2019 | 19 acres (8 ha) | 3 acres (1 ha) | 22 acres (9 ha) |
| 2020 | 15 acres (6 ha) | under 1 ha | 16 acres (6 ha) |
| 2021 | under 1 ha | under 1 ha | under 1 ha |
| 2022 | 27 acres (11 ha) | under 1 ha | 28 acres (11 ha) |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | 6 acres (2 ha) | under 1 ha | 6 acres (3 ha) |
| 2025 | under 1 ha | under 1 ha | 4 acres (2 ha) |
What is causing deforestation around Saint Paul?
- Towns and roadscleared for good79% · 262 acres (106 ha)
- Farms, pasture and plantationscleared for good7.3% · 24 acres (10 ha)
- Unknown causescause unknown13% · 42 acres (17 ha)
Also: logging.
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
- 39,000 acres (15,800 ha)
- Forest in 2020
- 39,600 acres (16,000 ha)
- Overall change
- +578 acres (234 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Saint Paul stayed about the same size, at about 39,600 acres (16,000 hectares): new forest grew on about 1,010 acres (409 hectares), and about 432 acres (175 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 Saint Paul
Same 2 km radius, same index — so they compare directly.
- Minneapolis14.0 km
United States
- Tree cover
- 19%
- Air quality
- 31
- Rochester113.9 km
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- Tree cover
- 42%
- Air quality
- 36
- Sioux Falls328.7 km
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- Tree cover
- 37%
- Air quality
- 10
- Cedar Rapids346.8 km
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- Tree cover
- 42%
- Air quality
- 35
- Fargo357.7 km
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- Tree cover
- 38%
- Air quality
- 44
- Madison361.2 km
United States
- Tree cover
- 31%
- Air quality
- 36
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Frequently asked
Questions about Saint Paul
What is the air quality (AQI) in Saint Paul right now?
The latest reading for Saint Paul shows an AQI of 25 (Good), measured Nov 11, 09:00 local time by the St. Paul-Harding H.S ground monitoring station, 3.0 mi (4.8 km) away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Saint Paul today?
At AQI 25 (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 Saint Paul been like this week?
Over the last 7 days, the CAMS air-quality model put Saint Paul's daily AQI at 31 on average, from 14 on Nov 5 to an hourly peak of 77 on Nov 6. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Saint Paul lost since 2001?
Since 2001, the area within 10 km of Saint Paul has lost about 330 acres (134 hectares) of forest (about 250 football fields): 2.2% 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 Saint Paul stayed about the same size, at about 39,600 acres (16,000 hectares): new forest grew on about 1,010 acres (409 hectares), and about 432 acres (175 hectares) were lost.
What is the tree count in Saint Paul?
Saint Paul has an estimated 79,903 trees across the 4.6 sq mi (11.84 km²) of land measured — 27.0% tree cover, 3 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Saint Paul need?
Saint Paul needs roughly 8,878 more trees to close a 3-point shortfall against its 30% tree-cover target — about 195.3 t of extra CO₂ absorbed per year once grown.
How are Saint Paul's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Core, 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 Core; the tree count is an estimate derived from that cover.
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