City report · Colorado, United States
Greeley Air quality today
Air quality in Greeley 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
- 22.8%
- trees in this area
- 71.0K
- more trees needed
- 22.4K
Measured across a 1.2 mi (2 km) radius around Greeley, CO, 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.
Greeley · AQI 25 (Good)
Greeley's tree count comes to 70,984 trees across 4.8 sq mi (12.46 km²) of land, 7 points below the 30% tree-cover level considered healthy for this area, so roughly 22,416 more trees would close the gap.
Air quality detail
Air quality in Greeley today: AQI 25, 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 · Bethke Elementary, 14.2 mi (22.8 km) away · median of 3 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.5
PM10
—
NO₂
30.9
O₃
19.6
SO₂
—
CO
458.2
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 Greeley's daily AQI at 49 on average, from 41 on Nov 7 to an hourly peak of 68 on Nov 6.
Where Greeley stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Greeley: Below target
22.8% tree cover against a 30% healthy-neighborhood target, across 4.8 sq mi (12.46 km²) of land.
Trees in this area
70,984
Target trees
93,400
More trees needed
22,416
CO₂ if planted / yr
493.2 t
Deforestation · 2001–2025
How much forest has Greeley lost?
There was almost no forest around Greeley in 2000, so there has been almost nothing to lose 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 August 2017 of a 5 × 5 km area in the city center.
Forest gained and lost, 2000–2020
- Forest in 2000
- 1,450 acres (588 ha)
- Forest in 2020
- 1,980 acres (802 ha)
- Overall change
- +529 acres (214 ha)more forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Greeley grew from about 1,450 acres (588 hectares) to 1,980 acres (802 hectares), a net gain of about 529 acres (214 hectares) (+36%). New forest grew on about 544 acres (220 hectares), while 14 acres (6 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 Greeley
Same 2 km radius, same index — so they compare directly.
- Fort Collins36.5 km
United States
- Tree cover
- 38%
- Air quality
- 37
- Thornton65.7 km
United States
- Tree cover
- 10%
- Air quality
- 132
- Boulder65.8 km
United States
- Tree cover
- 38%
- Air quality
- 14
- Arvada76.1 km
United States
- Tree cover
- 21%
- Air quality
- 32
- Aurora77.9 km
United States
- Tree cover
- 14%
- Air quality
- 23
- Denver79.6 km
United States
- Tree cover
- 13%
- Air quality
- 29
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Frequently asked
Questions about Greeley
What is the air quality (AQI) in Greeley right now?
The latest reading for Greeley shows an AQI of 25 (Good), measured Nov 11, 08:00 local time by 3 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Bethke Elementary, 14.2 mi (22.8 km) away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Greeley 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 Greeley been like this week?
Over the last 7 days, the CAMS air-quality model put Greeley's daily AQI at 49 on average, from 41 on Nov 7 to an hourly peak of 68 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 Greeley lost since 2001?
There was almost no forest around Greeley in 2000, so there has been almost nothing to lose 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 Greeley grew from about 1,450 acres (588 hectares) to 1,980 acres (802 hectares), a net gain of about 529 acres (214 hectares) (+36%). New forest grew on about 544 acres (220 hectares), while 14 acres (6 hectares) were lost.
What is the tree count in Greeley?
Greeley has an estimated 70,984 trees across the 4.8 sq mi (12.46 km²) of land measured — 22.8% tree cover, 7 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Greeley need?
Greeley needs roughly 22,416 more trees to close a 7-point shortfall against its 30% tree-cover target — about 493.2 t of extra CO₂ absorbed per year once grown.
How are Greeley's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Greeley, 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 Greeley; the tree count is an estimate derived from that cover.
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