City report · Colorado, United States
Aurora Air quality today
Air quality in Aurora currently reads AQI 23 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 23
Good
- PM2.5, fine particles (µg/m³)
- 4.1
- tree cover
- 13.6%
- trees in this area
- 42.7K
- more trees needed
- 51.5K
Measured across a 1.2 mi (2 km) radius around Hoffman Heights, Aurora, CO 80011, USA (4.9 sq mi), from a satellite image of Sep 9, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Aurora · AQI 23 (Good)
Aurora's tree count comes to 42,726 trees across 4.9 sq mi (12.57 km²), 16 points below the 30% tree-cover level considered healthy for this area, so roughly 51,522 more trees would close the gap.
Air quality detail
Air quality in Aurora today: AQI 23, 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 · Denver - NJH - 14th, 5.7 mi (9.2 km) away
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.1
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 Aurora's daily AQI at 52 on average, from 47 on Nov 8 to an hourly peak of 81 on Nov 5.
Where Aurora stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Aurora: Critically low
13.6% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
42,726
Target trees
94,248
More trees needed
51,522
CO₂ if planted / yr
1,133 t
Deforestation · 2001–2025
How much forest has Aurora lost?
There was very little forest around Aurora in 2000, about 81 acres (33 hectares), and about 4 acres (2 hectares) of it has been lost since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here.
2017: satellite photo from June 2017 of a 5 × 5 km area in the city center.
Acres of forest lost each year
Show the figures as a table
| Year | Cleared for good | Can grow back | Total |
|---|---|---|---|
| 2001 | under 1 ha | under 1 ha | under 1 ha |
| 2002 | under 1 ha | under 1 ha | under 1 ha |
| 2003 | under 1 ha | under 1 ha | under 1 ha |
| 2004 | under 1 ha | under 1 ha | under 1 ha |
| 2005 | under 1 ha | under 1 ha | under 1 ha |
| 2006 | under 1 ha | under 1 ha | under 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 | under 1 ha | under 1 ha | under 1 ha |
| 2016 | under 1 ha | under 1 ha | under 1 ha |
| 2017 | under 1 ha | under 1 ha | under 1 ha |
| 2018 | under 1 ha | under 1 ha | under 1 ha |
| 2019 | under 1 ha | under 1 ha | under 1 ha |
| 2020 | under 1 ha | under 1 ha | under 1 ha |
| 2021 | under 1 ha | under 1 ha | under 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 Aurora?
- Towns and roadscleared for good39% · under 1 ha
- Unknown causescause unknown56% · 2 acres (1 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
- 4,820 acres (1,950 ha)
- Forest in 2020
- 5,910 acres (2,390 ha)
- Overall change
- +1,090 acres (442 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Aurora grew from about 4,820 acres (1,950 hectares) to 5,910 acres (2,390 hectares), a net gain of about 1,090 acres (442 hectares) (+23%). New forest grew on about 1,100 acres (446 hectares), while 11 acres (4 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 Aurora
Same 2 km radius, same index — so they compare directly.
- Denver13.1 km
United States
- Tree cover
- 13%
- Air quality
- 29
- Centennial17.1 km
United States
- Tree cover
- 19%
- Air quality
- 34
- Thornton19.5 km
United States
- Tree cover
- 10%
- Air quality
- 132
- Lakewood21.5 km
United States
- Tree cover
- 27%
- Air quality
- 32
- Arvada23.3 km
United States
- Tree cover
- 21%
- Air quality
- 32
- Boulder49.1 km
United States
- Tree cover
- 38%
- Air quality
- 14
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Frequently asked
Questions about Aurora
What is the air quality (AQI) in Aurora right now?
The latest reading for Aurora shows an AQI of 23 (Good), measured Nov 11, 08:00 local time by the Denver - NJH - 14th ground monitoring station, 5.7 mi (9.2 km) away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Aurora today?
At AQI 23 (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 Aurora been like this week?
Over the last 7 days, the CAMS air-quality model put Aurora's daily AQI at 52 on average, from 47 on Nov 8 to an hourly peak of 81 on Nov 5. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Aurora lost since 2001?
There was very little forest around Aurora in 2000, about 81 acres (33 hectares), and about 4 acres (2 hectares) of it has been lost since. Only fairly dense woodland counts as forest in these maps, so scattered street and garden trees don't show up here. Comparing satellite maps from 2000 and 2020, the forest around Aurora grew from about 4,820 acres (1,950 hectares) to 5,910 acres (2,390 hectares), a net gain of about 1,090 acres (442 hectares) (+23%). New forest grew on about 1,100 acres (446 hectares), while 11 acres (4 hectares) were lost.
What is the tree count in Aurora?
Aurora has an estimated 42,726 trees across the 4.9 sq mi (12.57 km²) measured — 13.6% tree cover, 16 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Aurora need?
Aurora needs roughly 51,522 more trees to close a 16-point shortfall against its 30% tree-cover target — about 1,133 t of extra CO₂ absorbed per year once grown.
How are Aurora's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Hoffman Heights, 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 Hoffman Heights; the tree count is an estimate derived from that cover.
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