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AirHistory

Air Quality in Idaho

10-year air quality trends for 20 monitored areas in Idaho.

See full Idaho air quality rankings →
20
Cities
33
Avg AQI (5yr)
9
Improving
0
Stable
11
Worsening

All Monitored Areas in Idaho

Custer, Idaho

Custer County · AQI 8 (5yr avg) · Stable · PM2.5

A

Jerome, Idaho

Jerome County · AQI 17 (5yr avg) · Improving · PM2.5

B

Twin Falls, Idaho

Twin Falls County · AQI 27 (5yr avg) · Improving · PM2.5

B

Franklin, Idaho

Franklin County · AQI 25 (5yr avg) · Improving · PM2.5

B

Kootenai, Idaho

Kootenai County · AQI 30 (5yr avg) · Improving · PM2.5

B

Bonneville, Idaho

Bonneville County · AQI 30 (5yr avg) · Improving · PM2.5

B

Lemhi, Idaho

Lemhi County · AQI 40 (5yr avg) · Improving · PM2.5

B

Latah, Idaho

Latah County · AQI 18 (5yr avg) · Worsening · PM2.5

B

Shoshone, Idaho

Shoshone County · AQI 43 (5yr avg) · Improving · PM2.5

B

Butte, Idaho

Butte County · AQI 42 (5yr avg) · Worsening · Ozone

C

Blaine, Idaho

Blaine County · AQI 21 (5yr avg) · Worsening · PM2.5

C

Boise, Idaho

Boise County · AQI 43 (5yr avg) · Stable · PM2.5

C

Benewah, Idaho

Benewah County · AQI 48 (5yr avg) · Stable · PM2.5

C

Nez Perce, Idaho

Nez Perce County · AQI 33 (5yr avg) · Worsening · PM2.5

C

Ada, Idaho

Ada County · AQI 45 (5yr avg) · Worsening · Ozone

C

Bannock, Idaho

Bannock County · AQI 37 (5yr avg) · Worsening · PM2.5

C

Bonner, Idaho

Bonner County · AQI 33 (5yr avg) · Worsening · PM2.5

C

Idaho, Idaho

Idaho County · AQI 42 (5yr avg) · Worsening · PM2.5

C

Canyon, Idaho

Canyon County · AQI 41 (5yr avg) · Worsening · PM2.5

C

Valley, Idaho

Valley County · AQI 37 (5yr avg) · Worsening · PM2.5

D
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Frequently Asked Questions

Idaho has 20 monitored areas with an average 5-year AQI of 33 and an average Air Quality Grade of B. 9 cities are improving, 11 are worsening, and 0 are stable.

Custer, Idaho has the best Air Quality Grade (A) in Idaho with a 5-year average AQI of 8.

Of 20 monitored areas in Idaho, 9 are showing improving trends, 11 are worsening, and 0 remain stable over the past decade.

Sources: EPA Air Quality System (AQS)
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