City report · Arizona, United States
Mesa Air quality today
Air quality in Mesa currently reads AQI 36 (Good): Air quality is satisfactory for everyone.
Air quality right now
AQI 36
Good
- PM2.5, fine particles (µg/m³)
- 6.5
- tree cover
- 9.8%
- trees in this area
- 30.8K
- more trees needed
- 63.5K
Measured across a 1.2 mi (2 km) radius around Mesa, AZ, 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.
Mesa · AQI 36 (Good)
Mesa's tree count comes to 30,788 trees across 4.9 sq mi (12.57 km²), 20 points below the 30% tree-cover level considered healthy for this area, so roughly 63,460 more trees would close the gap.
Air quality detail
Air quality in Mesa today: AQI 36, 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 · Mesa - Brooks Reserv, 2.6 mi (4.2 km) away · median of 5 stations
Health signal
Air quality is satisfactory for everyone.
PM2.5
6.5
PM10
7.0
NO₂
—
O₃
49.1
SO₂
—
CO
229.1
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 Mesa's daily AQI at 56 on average, from 44 on Nov 7 to an hourly peak of 97 on Nov 4.
Where Mesa stands: the most polluted cities in the world right now · the cleanest
Tree cover detail
Tree cover in Mesa: Critically low
9.8% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).
Trees in this area
30,788
Target trees
94,248
More trees needed
63,460
CO₂ if planted / yr
1,396 t
Deforestation · 2001–2025
How much forest has Mesa lost?
There was very little forest around Mesa in 2000, about 17 acres (7 hectares), and about 5 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.
The worst year was 2010, when about 2 acres (1 hectare) 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 | 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 | 2 acres (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 Mesa?
- Towns and roadscleared for good60% · 3 acres (1 ha)
- Farms, pasture and plantationscleared for good25% · under 1 ha
- Unknown causescause unknown15% · under 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
- 272 acres (110 ha)
- Forest in 2020
- 236 acres (96 ha)
- Overall change
- −35 acres (14 ha)less forest than in 2000
Comparing satellite maps from 2000 and 2020, the forest around Mesa shrank from about 272 acres (110 hectares) to 236 acres (96 hectares), a net loss of about 35 acres (14 hectares) (−13%). New forest grew on about 26 acres (10 hectares), but 60 acres (24 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 Mesa
Same 2 km radius, same index — so they compare directly.
- Chandler13.0 km
United States
- Tree cover
- 6%
- Air quality
- 23
- Phoenix23.5 km
United States
- Tree cover
- 3%
- Air quality
- 67
- Glendale36.1 km
United States
- Tree cover
- 5%
- Air quality
- 67
- Deer Valley41.0 km
United States
- Tree cover
- 2%
- Air quality
- 53
- Surprise52.7 km
United States
- Tree cover
- 2%
- Air quality
- 82
- Tucson157.6 km
United States
- Tree cover
- 13%
- Air quality
- 13
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Frequently asked
Questions about Mesa
What is the air quality (AQI) in Mesa right now?
The latest reading for Mesa shows an AQI of 36 (Good), measured Nov 11, 07:00 local time by 5 ground monitoring stations via OpenAQ (the median of their readings; the nearest is Mesa - Brooks Reserv, 2.6 mi (4.2 km) away). The main pollutant is PM2.5. Air quality is satisfactory for everyone.
Is it safe to exercise outside in Mesa today?
At AQI 36 (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 Mesa been like this week?
Over the last 7 days, the CAMS air-quality model put Mesa'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 Mesa lost since 2001?
There was very little forest around Mesa in 2000, about 17 acres (7 hectares), and about 5 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 Mesa shrank from about 272 acres (110 hectares) to 236 acres (96 hectares), a net loss of about 35 acres (14 hectares) (−13%). New forest grew on about 26 acres (10 hectares), but 60 acres (24 hectares) were lost.
What is the tree count in Mesa?
Mesa has an estimated 30,788 trees across the 4.9 sq mi (12.57 km²) measured — 9.8% tree cover, 20 percentage points short of the 30% tree-cover target set for this area.
How many more trees does Mesa need?
Mesa needs roughly 63,460 more trees to close a 20-point shortfall against its 30% tree-cover target — about 1,396 t of extra CO₂ absorbed per year once grown.
How are Mesa's air quality and tree cover measured?
Air quality is measured by ground monitoring stations near Mesa, 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 Mesa; the tree count is an estimate derived from that cover.
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