Where is the air worst in Idaho right now?

Boundary County has the highest current reading at AQI 66 (Moderate).

How often are readings updated?

Monitors report every hour. We refresh this page with the latest hour from EPA AirNow.

Idaho Air Quality

Current AQI at 21 monitors, highest 66 (Moderate) · Measured 10/30/2026, 7:00 AM PT

Monitors: 21
Highest AQI: 66; Moderate
Typical (median): 38; Good
Above 100: 0

Monitoring sites in Idaho

Worst first. Times are local.

66Boundary CountyModerate · Fine particles (PM2.5) · Fri 10/30/2026, 8:00 AM MDT
63JuliaettaModerate · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
63MoscowModerate · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
62St. MariesModerate · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
56LewistonModerate · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
55CottonwoodModerate · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
52PinehurstModerate · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
51GrangevilleModerate · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
49McCallGood · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
38Idaho CityGood · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
38Twin Falls PM25Good · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
38White PineGood · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
33Craters of the Moon NMGood · Ozone · Fri 10/30/2026, 7:00 AM MDT
33Salmon PM2.5Good · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
23Idaho Falls PM2.5Good · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
19Rexburg PM25Good · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
18Pocatello Garrett and GouldGood · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
11Nez Perce TribeGood · Ozone · Fri 10/30/2026, 7:00 AM MDT
10Shoshone Bannock TribesGood · Coarse particles (PM10) · Fri 10/30/2026, 8:00 AM MDT
9Garden ValleyGood · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT
0KetchumGood · Fine particles (PM2.5) · Fri 10/30/2026, 7:00 AM MDT

By county

Highest current AQI among the county's monitors

Frequently asked questions

Where is the air worst in Idaho right now?: Boundary County has the highest current reading at AQI 66 (Moderate).
How often are readings updated?: Monitors report every hour. We refresh this page with the latest hour from EPA AirNow.

Source: EPA AirNow · Last updated 10/30/2026 · Data are preliminary and subject to change

What the AQI means

0-50Good. Air quality is satisfactory and poses little or no risk.
51-100Moderate. Acceptable. A few unusually sensitive people may have symptoms.
101-150Unhealthy for Sensitive Groups. People with heart or lung disease, older adults, children and teens should limit long or heavy outdoor exertion.
151-200Unhealthy. Everyone may begin to feel effects. Sensitive groups should avoid long or heavy outdoor exertion.
201-300Very Unhealthy. Health alert: the risk of health effects is increased for everyone.
301-500Hazardous. Health warning of emergency conditions. Everyone is more likely to be affected.

Data sources

AirNowU.S. Environmental Protection Agency · Official site

Data as of 10/30/2026

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About this data

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