Boise Air Quality in 2024: Pollution Patterns
How air quality behaves in Boise: the latest measured AQI, which pollutants dominate, seasonal patterns, and the local drivers of pollution.
Current Air Quality
Members of sensitive groups may experience health effects. The general public is less likely to be affected.
Protect Your Indoor Air in Boise
With an AQI of 101 in Boise driven by fine particulate matter (PM2.5), outdoor pollution is seeping indoors. A True-HEPA purifier captures up to 99.97% of the PM2.5, wildfire smoke and fine particles behind this reading. On unhealthy days like today, size up to a higher-CADR unit so it can clear the whole living area quickly.
Recommended: Coway AP-1512HH Mighty — True HEPA + carbon · CADR ~246 CFM · rooms up to 361 sq ft
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Boise Air Quality in 2024
This page covers what shapes air quality in Boise over the course of a year: the pollutants that dominate locally, how conditions typically shift between seasons, and the local emission sources behind them. Measured 2024 annual statistics are published by EPA's Air Quality System, not here, so the AQI figure below is the latest observation available when this page was published.
View Current Boise Air Quality →Latest Measured Reading for Boise
The most recent EPA AirNow observation for the Boise reporting area puts Boise's AQI at 101 (Unhealthy for Sensitive Groups), with fine particulate matter (PM2.5) as the dominant pollutant — typical for the Mountain West region. Observed 4:00 AM MDT on August 9, 2026. Reported by Idaho Department of Environmental Quality.
This is a single observation captured when the page was published, not a 2024 average. For measured annual and monthly statistics, use the EPA's Air Quality System reports.
How Boise Air Quality Shifts Through the Year
Mar–May: Usually Boise's cleanest stretch. Mild temperatures and better atmospheric mixing keep both ozone and particulates down.
Jun–Aug: Heat and sunlight drive higher ozone and, in the West, wildfire-smoke episodes. Afternoons are typically the worst time to be outside.
Sep–Nov: Air quality generally improves as temperatures drop, though early fall can still carry wildfire smoke in the Mountain West region.
Dec–Feb: Cold-air temperature inversions can trap PM2.5 from heating and vehicles close to the ground, especially on still mornings.
Seasonal patterns above describe how pollution typically behaves in this region. They are not measured 2024 averages for Boise.
Is It Safe to Exercise Outside in Boise?
With Boise's AQI at 101 (Unhealthy for Sensitive Groups), outdoor exercise should be limited. Heavy breathing during exercise pulls more fine particulate matter (PM2.5) deep into your lungs. Move workouts indoors, reduce intensity, or wait for AQI to drop below 100. Sensitive groups should avoid outdoor exertion entirely until conditions improve.
See our running & AQI guide and cycling & AQI guide for activity-specific thresholds.
What's Causing Boise's Air Pollution?
In Boise, the leading pollutant is fine particulate matter (PM2.5). As part of the Mountain West region, the main drivers of air pollution here are:
- •Winter temperature inversions that trap pollutants in valleys
- •Wildfire smoke during increasingly severe fire seasons
- •Wood-burning stoves and fireplaces in cold months
- •Vehicle emissions concentrated along urban corridors
Dig deeper: Boise PM2.5 levels · Boise ozone levels
Air Purifier & Monitor Buying Guides
Not sure which device fits your needs? Our hands-on guides break down the best picks by use case.
PM2.5 Levels
Fine particulate matter data →
Ozone Levels
Ground-level ozone data →
Seasonal Guides
Air quality by season →
Health Effects
Learn about air pollution impacts →
Frequently Asked Questions About Boise Air Quality
What is the current air quality in Boise?
The current Air Quality Index (AQI) in Boise, ID is 101, which is considered unhealthy for sensitive groups.
Is it safe to exercise outdoors in Boise?
Check current conditions before exercising outdoors. When AQI exceeds 100, consider reducing outdoor activity intensity.
When is the best time of year to visit Boise for good air quality?
Spring and early fall typically offer the best air quality in Boise. Summer months may have elevated ozone levels, while winter can see higher PM2.5 from temperature inversions.
What causes air pollution in Boise?
Air pollution in Boise can come from vehicle emissions, industrial activity, construction, wildfires, and weather patterns. Local geography and seasonal factors also play a significant role.
Explore More Air Quality Data
Protect Your Indoor Air in Boise
With an AQI of 101 in Boise driven by fine particulate matter (PM2.5), outdoor pollution is seeping indoors. A True-HEPA purifier captures up to 99.97% of the PM2.5, wildfire smoke and fine particles behind this reading. On unhealthy days like today, size up to a higher-CADR unit so it can clear the whole living area quickly.
Compare top-rated True-HEPA purifiers:
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