City report · Pennsylvania, United States
Allentown Air quality today
Air quality in Allentown currently reads AQI 17 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 17
Good
- PM2.5, fine particles (µg/m³)
- 3.1
- tree cover
- 29.4%
- trees in this area
- 92.4K
- more trees needed
- 1.9K
Measured across a 1.2 mi (2 km) radius around Allentown, PA, USA (4.9 sq mi), from a satellite image of Sep 11, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Allentown · AQI 17 (Good)
Allentown's tree count comes to 92,363 trees across 4.9 sq mi (12.57 km²), 1 points below the 30% tree-cover level considered healthy for this area, so roughly 1,885 more trees would close the gap.
Air quality detail
Air quality in Allentown today: AQI 17, 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 · Whitehall, 2.1 mi (3.3 km) away
Health signal
Air quality is satisfactory for everyone.
PM2.5
3.1
PM10
—
NO₂
—
O₃
—
SO₂
—
CO
—
Data: OpenAQ · AirGradient, mellofone
- 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 Allentown's daily AQI at 20 on average, from 14 on Nov 9 to an hourly peak of 60 on Nov 7.
Where Allentown stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Allentown: Below target
29.4% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
92,363
Target trees
94,248
More trees needed
1,885
CO₂ if planted / yr
41.5 t
Deforestation · 2001–2025
How much forest has Allentown lost?
Since 2001, the area within 10 km of Allentown has lost about 421 acres (170 hectares) of forest (about 320 football fields): 1.9% of the forest it had in 2000. Most of it (55%) was deforestation, forest cleared for good, mainly for towns and roads.
2017: satellite photo from August 2017 of a 5 × 5 km area about 6 km southeast of the city center.
- Forest lost since 2001
- 421 acres (170 ha)about 320 football fields
- Share of its forest
- 1.9%of what there was in 2000
- Cleared for good
- 233 acres (94 ha)deforestation: turned into farms, mines or towns
The worst year was 2022, when about 127 acres (52 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 | 7 acres (3 ha) | under 1 ha | 9 acres (4 ha) |
| 2002 | 4 acres (2 ha) | under 1 ha | 4 acres (2 ha) |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | 17 acres (7 ha) | 4 acres (2 ha) | 21 acres (9 ha) |
| 2005 | 15 acres (6 ha) | 5 acres (2 ha) | 20 acres (8 ha) |
| 2006 | 10 acres (4 ha) | under 1 ha | 11 acres (4 ha) |
| 2007 | 9 acres (4 ha) | 7 acres (3 ha) | 16 acres (7 ha) |
| 2008 | 6 acres (2 ha) | 5 acres (2 ha) | 10 acres (4 ha) |
| 2009 | 6 acres (2 ha) | under 1 ha | 8 acres (3 ha) |
| 2010 | under 1 ha | under 1 ha | 3 acres (1 ha) |
| 2011 | under 1 ha | under 1 ha | under 1 ha |
| 2012 | under 1 ha | under 1 ha | under 1 ha |
| 2013 | 3 acres (1 ha) | under 1 ha | 4 acres (2 ha) |
| 2014 | 3 acres (1 ha) | under 1 ha | 5 acres (2 ha) |
| 2015 | 5 acres (2 ha) | under 1 ha | 6 acres (3 ha) |
| 2016 | 2 acres (1 ha) | under 1 ha | 3 acres (1 ha) |
| 2017 | 5 acres (2 ha) | 23 acres (9 ha) | 28 acres (11 ha) |
| 2018 | 7 acres (3 ha) | under 1 ha | 7 acres (3 ha) |
| 2019 | 12 acres (5 ha) | under 1 ha | 12 acres (5 ha) |
| 2020 | 15 acres (6 ha) | 4 acres (2 ha) | 19 acres (8 ha) |
| 2021 | 16 acres (6 ha) | 19 acres (8 ha) | 34 acres (14 ha) |
| 2022 | 36 acres (14 ha) | 92 acres (37 ha) | 127 acres (52 ha) |
| 2023 | under 1 ha | under 1 ha | under 1 ha |
| 2024 | 24 acres (10 ha) | 4 acres (2 ha) | 28 acres (11 ha) |
| 2025 | 29 acres (12 ha) | 11 acres (4 ha) | 39 acres (16 ha) |
What is causing deforestation around Allentown?
- Towns and roadscleared for good55% · 234 acres (95 ha)
- Loggingcan grow back35% · 146 acres (59 ha)
- Unknown causescause unknown9.9% · 42 acres (17 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
- 35,400 acres (14,300 ha)
- Forest in 2020
- 36,800 acres (14,900 ha)
- Overall change
- +1,410 acres (571 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Allentown grew from about 35,400 acres (14,300 hectares) to 36,800 acres (14,900 hectares), a net gain of about 1,410 acres (571 hectares) (+4%). New forest grew on about 1,930 acres (781 hectares), while 519 acres (210 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 Allentown
Same 2 km radius, same index — so they compare directly.
- Philadelphia78.0 km
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- Tree cover
- 12%
- Air quality
- 64
- Edison91.6 km
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- Tree cover
- 39%
- Air quality
- 18
- Elizabeth108.1 km
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- 15%
- Air quality
- 31
- Newark112.0 km
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- Tree cover
- 11%
- Air quality
- 56
- Staten Island114.1 km
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- Tree cover
- 43%
- Air quality
- 54
- Paterson116.2 km
United States
- Tree cover
- 26%
- Air quality
- 29
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Frequently asked
Questions about Allentown
What is the air quality (AQI) in Allentown right now?
The latest reading for Allentown shows an AQI of 17 (Good), measured Nov 11, 10:00 local time by the Whitehall ground monitoring station, 2.1 mi (3.3 km) away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Allentown today?
At AQI 17 (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 Allentown been like this week?
Over the last 7 days, the CAMS air-quality model put Allentown's daily AQI at 20 on average, from 14 on Nov 9 to an hourly peak of 60 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 Allentown lost since 2001?
Since 2001, the area within 10 km of Allentown has lost about 421 acres (170 hectares) of forest (about 320 football fields): 1.9% of the forest it had in 2000. Most of it (55%) was deforestation, forest cleared for good, mainly for towns and roads. Comparing satellite maps from 2000 and 2020, the forest around Allentown grew from about 35,400 acres (14,300 hectares) to 36,800 acres (14,900 hectares), a net gain of about 1,410 acres (571 hectares) (+4%). New forest grew on about 1,930 acres (781 hectares), while 519 acres (210 hectares) were lost.
What is the tree count in Allentown?
Allentown has an estimated 92,363 trees across the 4.9 sq mi (12.57 km²) measured — 29.4% tree cover, 1 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Allentown need?
Allentown needs roughly 1,885 more trees to close a 1-point shortfall against its 30% tree-cover target — about 41.5 t of extra CO₂ absorbed per year once grown.
How are Allentown's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Allentown, 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 Allentown; the tree count is an estimate derived from that cover.
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