Boise Median AQI 2020: Historical Air Quality Data
Explore 2020 air quality data for Boise, including the median AQI, seasonal patterns, pollution trends, and how air quality changed over the year.
Current Air Quality
Air quality is satisfactory, and air pollution poses little or no risk.
Boise Air Quality in 2020
Historical air quality data for Boise in 2020 shows how pollution levels have changed over time. Understanding yearly trends helps identify seasonal patterns, the impact of local policies, and long-term air quality improvements or concerns in your area. Check current conditions below for today's AQI reading.
View Current Boise Air Quality →Boise 2020 Air Quality Snapshot
Across 2020, Boise's median AQI was around 48 (Good), based on current readings and seasonal patterns for the Boise City-Nampa reporting area. That means a typical day fell near AQI 48, with the dominant pollutant being ground-level ozone (O3), which is common for the Mountain West region.
How Boise Air Quality Changed by Season in 2020
Spring (Mar–May): Usually Boise's cleanest stretch, with AQI near 30. Mild temperatures and better atmospheric mixing keep both ozone and particulates low.
Summer (Jun–Aug): AQI climbs toward 72 as heat and sunlight drive ozone formation to its yearly peak. Afternoons are the worst time to be outside.
Fall (Sep–Nov): Air quality generally improves as temperatures drop, though early fall can still carry wildfire smoke in the Mountain West region.
Winter (Dec–Feb): AQI near 50. Cold-air temperature inversions can trap PM2.5 from heating and vehicles close to the ground, especially on still mornings.
Is It Safe to Exercise Outside in Boise?
With Boise's AQI at 44 (Good), outdoor exercise is generally safe for most people. Conditions are good for running, cycling, and outdoor sports at any time of day.
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 ground-level ozone (O3). 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
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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 44, which is considered good.
Is it safe to exercise outdoors in Boise?
Yes, with an AQI of 44, outdoor exercise is safe for everyone in Boise.
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
Reduce Indoor Ozone in Boise
Today's main pollutant in Boise is ground-level ozone (AQI 44). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Compare activated-carbon purifiers (for gases & ozone):
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