City report · Pennsylvania, United States
Erie Air quality today
Air quality in Erie currently reads AQI 13 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 13
Good
- PM2.5, fine particles (µg/m³)
- 2.5
- tree cover
- 26.6%
- trees in this area
- 67.8K
- more trees needed
- 8.7K
Measured across a 1.2 mi (2 km) radius around Erie, PA, USA (4.9 sq mi), from a satellite image of Sep 14, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Erie · AQI 13 (Good)
Erie's tree count comes to 67,772 trees across 3.9 sq mi (10.19 km²) of land, 3 points below the 30% tree-cover level considered healthy for this area, so roughly 8,663 more trees would close the gap.
Air quality detail
Air quality in Erie today: AQI 13, Good
Main pollutant: PM2.5 · Observed Nov 10, 15:00 local time via Open-Meteo / CAMS, corrected with 21 ground-station cities within 205 km, US EPA index. Values in µg/m³.
Estimate · model corrected with 21 station cities within 127.4 mi (205 km), e.g. Brantford and Hamilton
Health signal
Air quality is satisfactory for everyone.
PM2.5
2.5
PM10
3.0
NO₂
7.8
O₃
57.0
SO₂
1.8
CO
168.0
- 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 Erie's daily AQI at 18 on average, from 8 on Nov 9 to an hourly peak of 49 on Nov 8.
Where Erie stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Erie: Below target
26.6% tree cover against a 30% healthy-neighborhood target, across 3.9 sq mi (10.19 km²) of land.
Trees in this area
67,772
Target trees
76,435
More trees needed
8,663
CO₂ if planted / yr
190.6 t
Deforestation · 2001–2025
How much forest has Erie lost?
Since 2001, the area within 10 km of Erie has lost about 774 acres (313 hectares) of forest (about 590 football fields): 4.3% of the forest it had in 2000. Most of it (92%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from September 2017 of a 5 × 5 km area about 7 km southeast of the city center.
- Forest lost since 2001
- 774 acres (313 ha)about 590 football fields
- Share of its forest
- 4.3%of what there was in 2000
- Cleared for good
- 710 acres (288 ha)deforestation: turned into farms, mines or towns
The worst year was 2005, when about 83 acres (34 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 | 67 acres (27 ha) | under 1 ha | 69 acres (28 ha) |
| 2002 | 28 acres (11 ha) | under 1 ha | 28 acres (12 ha) |
| 2003 | 23 acres (9 ha) | under 1 ha | 23 acres (9 ha) |
| 2004 | 79 acres (32 ha) | under 1 ha | 81 acres (33 ha) |
| 2005 | 82 acres (33 ha) | under 1 ha | 83 acres (34 ha) |
| 2006 | 76 acres (31 ha) | under 1 ha | 77 acres (31 ha) |
| 2007 | 43 acres (18 ha) | under 1 ha | 46 acres (18 ha) |
| 2008 | 15 acres (6 ha) | under 1 ha | 15 acres (6 ha) |
| 2009 | 29 acres (12 ha) | under 1 ha | 30 acres (12 ha) |
| 2010 | 51 acres (21 ha) | under 1 ha | 52 acres (21 ha) |
| 2011 | 6 acres (2 ha) | 3 acres (1 ha) | 8 acres (3 ha) |
| 2012 | 43 acres (17 ha) | 4 acres (2 ha) | 47 acres (19 ha) |
| 2013 | 30 acres (12 ha) | under 1 ha | 30 acres (12 ha) |
| 2014 | 7 acres (3 ha) | under 1 ha | 9 acres (4 ha) |
| 2015 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | 7 acres (3 ha) | under 1 ha | 9 acres (4 ha) |
| 2017 | 10 acres (4 ha) | 5 acres (2 ha) | 15 acres (6 ha) |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | 19 acres (8 ha) | under 1 ha | 19 acres (8 ha) |
| 2020 | 8 acres (3 ha) | 13 acres (5 ha) | 21 acres (8 ha) |
| 2021 | 45 acres (18 ha) | 21 acres (9 ha) | 66 acres (27 ha) |
| 2022 | 11 acres (5 ha) | under 1 ha | 12 acres (5 ha) |
| 2023 | 4 acres (2 ha) | under 1 ha | 5 acres (2 ha) |
| 2024 | 24 acres (10 ha) | under 1 ha | 24 acres (10 ha) |
| 2025 | 2 acres (1 ha) | under 1 ha | 4 acres (2 ha) |
What is causing deforestation around Erie?
- Towns and roadscleared for good88% · 680 acres (275 ha)
- Loggingcan grow back4.1% · 31 acres (13 ha)
- Farms, pasture and plantationscleared for good3.8% · 29 acres (12 ha)
Also: storms, floods and other natural causes, 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
- 22,600 acres (9,160 ha)
- Forest in 2020
- 22,700 acres (9,200 ha)
- Overall change
- +111 acres (45 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Erie stayed about the same size, at about 22,700 acres (9,200 hectares): new forest grew on about 835 acres (338 hectares), and about 724 acres (293 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 Erie
Same 2 km radius, same index — so they compare directly.
- Brantford112.6 km
Canada
- Tree cover
- 37%
- Air quality
- 66
- Hamilton126.1 km
Canada
- Tree cover
- 28%
- Air quality
- 50
- Buffalo129.9 km
United States
- Tree cover
- 16%
- Air quality
- 60
- London133.6 km
Canada
- Tree cover
- 31%
- Air quality
- 62
- St. Catharines134.8 km
Canada
- Tree cover
- 33%
- Air quality
- 33
- Cambridge138.1 km
Canada
- Tree cover
- 42%
- Air quality
- 66
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Frequently asked
Questions about Erie
What is the air quality (AQI) in Erie right now?
The latest reading for Erie shows an AQI of 13 (Good), observed Nov 10, 15:00 local time via Open-Meteo / CAMS, corrected with 21 ground-station cities within 205 km, US EPA index. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Erie today?
At AQI 13 (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 Erie been like this week?
Over the last 7 days, the CAMS air-quality model put Erie's daily AQI at 18 on average, from 8 on Nov 9 to an hourly peak of 49 on Nov 8. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Erie lost since 2001?
Since 2001, the area within 10 km of Erie has lost about 774 acres (313 hectares) of forest (about 590 football fields): 4.3% of the forest it had in 2000. Most of it (92%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Erie stayed about the same size, at about 22,700 acres (9,200 hectares): new forest grew on about 835 acres (338 hectares), and about 724 acres (293 hectares) were lost.
What is the tree count in Erie?
Erie has an estimated 67,772 trees across the 3.9 sq mi (10.19 km²) of land measured — 26.6% tree cover, 3 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Erie need?
Erie needs roughly 8,663 more trees to close a 3-point shortfall against its 30% tree-cover target — about 190.6 t of extra CO₂ absorbed per year once grown.
How are Erie's air quality and tree cover measured?
Air quality comes from ground monitoring stations via OpenAQ where one reports nearby, and otherwise, as here, from the Open-Meteo / CAMS model, which may differ from street-level monitors. 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 Erie; the tree count is an estimate derived from that cover.
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