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City report · United States

Boise Air quality today

Air quality in Boise currently reads AQI 11 (Good): Air quality is satisfactory for everyone.

Air quality right now

AQI 11

Good

Main pollutant: PM2.5
PM2.5, fine particles (µg/m³)
2.0
tree cover
36.6%
trees in this area
115K
more trees needed
0

Measured across a 1.2 mi (2 km) radius around Downtown, Boise, ID, USA (4.9 sq mi), from a satellite image of Sep 14, 2026. Lower AQI is better: 0–50 is Good, above 300 is Hazardous.

Boise · AQI 11 (Good)

Dark green marks tree cover detected inside the study radius.Sentinel-2 L2A (ESA Copernicus) via Earth Search, captured Sep 14, 2026

Boise's tree count comes to 114,982 trees across 4.9 sq mi (12.57 km²), already at or above the 30% tree-cover level considered healthy for this area.

Air quality detail

Air quality in Boise today: AQI 11, 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 · White Pine, 2.8 mi (4.5 km) away

Health signal

Air quality is satisfactory for everyone.

PM2.5

2.0

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 Boise's daily AQI at 39 on average, from 17 on Nov 7 to an hourly peak of 71 on Nov 8.

Last 7 days · model estimateavg 39 · peak 71
Nov 4: AQI 47 (peak 58)Nov 5: AQI 33 (peak 59)Nov 6: AQI 37 (peak 59)Nov 7: AQI 17 (peak 52)Nov 8: AQI 31 (peak 71)Nov 9: AQI 58 (peak 71)Nov 10: AQI 50 (peak 61)
Nov 4Nov 10

Where Boise stands: the most polluted cities in the world right now · the cleanest

Tree cover detail

Tree cover in Boise: Healthy tree cover

36.6% tree cover against a 30% healthy-neighborhood target, across 4.9 sq mi (12.57 km²).

Target reached

Trees in this area

114,982

Target trees

114,982

More trees needed

0

CO₂ if planted / yr

0 kg

Deforestation · 2001–2025

How much forest has Boise lost?

Since 2001, the area within 10 km of Boise has lost about 27 acres (11 hectares) of forest (about 21 football fields): 1.9% of the forest it had in 2000. The biggest cause was towns and roads (48%). About 13 acres (5 hectares) (49%) was deforestation: forest cleared for good for farms, mines or towns.

Satellite image of the area around Boise, September 2018

2018: satellite photo from September 2018 of a 5 × 5 km area in the city center.

Forest lost since 2001
27 acres (11 ha)about 21 football fields
Share of its forest
1.9%of what there was in 2000
Cleared for good
13 acres (5 ha)deforestation: turned into farms, mines or towns

The worst year was 2008, when about 5 acres (2 hectares) of forest were lost.

Forest lost each year around Boise, 2001–2025

Acres of forest lost each year

Forest lost each year around Boise, 2001–2025. Use the left and right arrow keys to read each year.4.7

Show the figures as a table
Forest lost each year around Boise, 2001–2025
YearCleared for goodCan grow backTotal
2001under 1 haunder 1 haunder 1 ha
2002under 1 haunder 1 haunder 1 ha
2003under 1 haunder 1 haunder 1 ha
2004under 1 haunder 1 ha3 acres (1 ha)
2005under 1 haunder 1 haunder 1 ha
2006under 1 haunder 1 haunder 1 ha
2007under 1 haunder 1 ha3 acres (1 ha)
20083 acres (1 ha)under 1 ha5 acres (2 ha)
2009under 1 haunder 1 haunder 1 ha
2010under 1 haunder 1 haunder 1 ha
2011under 1 haunder 1 haunder 1 ha
2012under 1 haunder 1 haunder 1 ha
2013under 1 haunder 1 haunder 1 ha
2014under 1 haunder 1 haunder 1 ha
2015under 1 haunder 1 haunder 1 ha
2016under 1 haunder 1 haunder 1 ha
2017under 1 haunder 1 haunder 1 ha
2018under 1 haunder 1 haunder 1 ha
2019under 1 haunder 1 ha2 acres (1 ha)
2020under 1 haunder 1 haunder 1 ha
2021under 1 haunder 1 haunder 1 ha
2022under 1 haunder 1 haunder 1 ha
2023under 1 haunder 1 haunder 1 ha
2024under 1 haunder 1 haunder 1 ha
2025under 1 haunder 1 haunder 1 ha

What is causing deforestation around Boise?

  • Towns and roadscleared for good48% · 13 acres (5 ha)
  • Unknown causescause unknown51% · 14 acres (6 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
11,500 acres (4,670 ha)
Forest in 2020
12,700 acres (5,120 ha)
Overall change
+1,130 acres (456 ha)more forest than in 2000

Comparing satellite maps from 2000 and 2020, the forest around Boise grew from about 11,500 acres (4,670 hectares) to 12,700 acres (5,120 hectares), a net gain of about 1,130 acres (456 hectares) (+9.8%). New forest grew on about 1,190 acres (482 hectares), while 64 acres (26 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

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Same 2 km radius, same index — so they compare directly.

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  • West Valley City

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  • Salt Lake City

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  • West Jordan

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  • Provo

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    Air quality
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Boise air quality (AQI) and tree cover — measured by Airleaf
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Frequently asked

Questions about Boise

What is the air quality (AQI) in Boise right now?

The latest reading for Boise shows an AQI of 11 (Good), measured Nov 11, 07:00 local time by the White Pine ground monitoring station, 2.8 mi (4.5 km) away, via OpenAQ. The main pollutant is PM2.5. Air quality is satisfactory for everyone.

Is it safe to exercise outside in Boise today?

At AQI 11 (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 Boise been like this week?

Over the last 7 days, the CAMS air-quality model put Boise's daily AQI at 39 on average, from 17 on Nov 7 to an hourly peak of 71 on Nov 8. No day averaged above 100, the level where the air turns unhealthy for sensitive groups.

How much forest has the area around Boise lost since 2001?

Since 2001, the area within 10 km of Boise has lost about 27 acres (11 hectares) of forest (about 21 football fields): 1.9% of the forest it had in 2000. The biggest cause was towns and roads (48%). About 13 acres (5 hectares) (49%) was deforestation: forest cleared for good for farms, mines or towns. Comparing satellite maps from 2000 and 2020, the forest around Boise grew from about 11,500 acres (4,670 hectares) to 12,700 acres (5,120 hectares), a net gain of about 1,130 acres (456 hectares) (+9.8%). New forest grew on about 1,190 acres (482 hectares), while 64 acres (26 hectares) were lost.

What is the tree count in Boise?

Boise has an estimated 114,982 trees across the 4.9 sq mi (12.57 km²) measured — 36.6% tree cover, already past the 30% tree-cover target set for this area.

How many more trees does Boise need?

Boise has already reached its tree-cover target, so no additional trees are needed to close the gap.

How are Boise's air quality and tree cover measured?

Air quality is measured by ground monitoring stations near Downtown, 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 Downtown; the tree count is an estimate derived from that cover.

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