Idaho local data guide

Current Air Quality Index for Boise, Idaho

As of September 15, 2026, the Boise region is experiencing "Good" air quality with a forecasted Air Quality Index (AQI) of 44.

Updated with grounded research as of 2026-09-15.

The short answer

For September 15, 2026, the Idaho Department of Environmental Quality has forecasted the air quality in the Boise region to be in the "Good" category, with an AQI of 44. This level indicates satisfactory air quality with little to no risk from air pollution.

Key facts

Date
September 15, 2026
Boise Forecast AQI
44 (Good)

Understanding the Air Quality Index (AQI)

The Air Quality Index is a standardized tool used to communicate how clean or polluted the air is and what associated health effects might be a concern. The index runs from 0 to 500, with higher values indicating greater levels of pollution and increased health risks.

  • 0–50: Good (Satisfactory air quality)
  • 51–100: Moderate (Acceptable, though sensitive individuals may have concerns)
  • 101–150: Unhealthy for Sensitive Groups
  • 151+: Unhealthy to Hazardous

Factors Influencing Boise Air Quality

Boise's air quality is shaped by the Treasure Valley's unique geography. The city is nestled between the Boise Foothills to the north and the Owyhee Mountains to the south, which can trap pollutants. Common sources of air quality degradation include vehicle emissions, particularly along the I-84 corridor, and residential wood burning during cooler months. Additionally, summer months are prone to wildfire smoke drift from surrounding regions, which can lead to rapid, temporary declines in air quality.

How to Stay Informed

Air quality conditions are dynamic and can shift based on weather patterns, temperature inversions, and wildfire activity. Residents are encouraged to check official forecasts regularly when planning outdoor activities, particularly if they are part of sensitive groups.

  • Monitor daily updates through the Idaho Department of Environmental Quality (DEQ) website.
  • Use the EPA's 'AirNow' platform for national and localized tracking.
  • Check local fire department or sheriff's office updates regarding potential outdoor burning restrictions.

Common questions

What does an AQI of 44 mean for my health?

An AQI of 44 falls within the 'Good' range (0–50). At this level, air pollution poses little to no risk, and it is considered a safe day for outdoor activities for the general population.

Can I perform outdoor burning in Boise when the AQI is 44?

Yes, as of September 15, 2026, there are no air quality-related restrictions on outdoor burning in the Treasure Valley. However, you should always verify with your local fire department or sheriff's office for specific jurisdictional rules before beginning any burn.

Where can I find real-time air quality data for Idaho?

You can access real-time data through the Idaho DEQ's website or the EPA's AirNow Fire and Smoke Map, which uses 'NowCast' technology to provide current air quality readings based on hourly data.

Related Idaho questions

  • How does the AQI scale work?
  • What are the main causes of air pollution in the Treasure Valley?
  • Where can I find real-time air quality updates for Idaho?

Sources and verification