City report · Arizona, United States
Tempe Air quality today
Air quality in Tempe currently reads AQI 26 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 26
Good
- PM2.5, fine particles (µg/m³)
- 4.7
- tree cover
- 4.0%
- trees in this area
- 12.6K
- more trees needed
- 81.7K
Measured across a 1.2 mi (2 km) radius around University Heights, Tempe, AZ 85281, USA (4.9 sq mi), from a satellite image of Sep 13, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.
Tempe · AQI 26 (Good)
Tempe's tree count comes to 12,566 trees across 4.9 sq mi (12.57 km²), 26 points below the 30% tree-cover level considered healthy for this area, so roughly 81,681 more trees would close the gap.
Air quality detail
Air quality in Tempe today: AQI 26, Good
Main pollutant: PM2.5 · Observed Nov 11, 07:00 local time via OpenAQ ground stations, US EPA index. Values in µg/m³.
Ground station · Tempe, 1.5 mi (2.4 km) away · median of 5 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
4.7
PM10
8.0
NO₂
37.6
O₃
43.2
SO₂
—
CO
401.0
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 Tempe's daily AQI at 56 on average, from 44 on Nov 7 to an hourly peak of 97 on Nov 4.
Where Tempe stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Tempe: Critically low
4.0% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
12,566
Target trees
94,247
More trees needed
81,681
CO₂ if planted / yr
1,797 t
Deforestation · 2001–2025
How much forest has Tempe lost?
There was almost no forest around Tempe 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 June 2017 of a 5 × 5 km area in the city center.
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. Images: contains modified Copernicus Sentinel data. How it's measured
In the same region
Measured cities near Tempe
Same 2 km radius, same index — so they compare directly.
- Chandler13.6 km
United States
- Tree cover
- 6%
- Air quality
- 23
- Phoenix15.7 km
United States
- Tree cover
- 3%
- Air quality
- 67
- Glendale29.1 km
United States
- Tree cover
- 5%
- Air quality
- 67
- Deer Valley36.5 km
United States
- Tree cover
- 2%
- Air quality
- 53
- Surprise46.0 km
United States
- Tree cover
- 2%
- Air quality
- 82
- Tucson161.4 km
United States
- Tree cover
- 13%
- Air quality
- 13
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Frequently asked
Questions about Tempe
What is the air quality (AQI) in Tempe right now?
The latest reading for Tempe shows an AQI of 26 (Good), measured Nov 11, 07:00 local time by 5 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Tempe, 1.5 mi (2.4 km) away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Tempe today?
At AQI 26 (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 Tempe been like this week?
Over the last 7 days, the CAMS air-quality model put Tempe's daily AQI at 56 on average, from 44 on Nov 7 to an hourly peak of 97 on Nov 4. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.
How much forest has the area around Tempe lost since 2001?
There was almost no forest around Tempe 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.
What is the tree count in Tempe?
Tempe has an estimated 12,566 trees across the 4.9 sq mi (12.57 km²) measured — 4.0% tree cover, 26 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Tempe need?
Tempe needs roughly 81,681 more trees to close a 26-point shortfall against its 30% tree-cover target — about 1,797 t of extra CO₂ absorbed per year once grown.
How are Tempe's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near University 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 University Heights; the tree count is an estimate derived from that cover.
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