Idaho Air Quality
Boise is the worst air in Idaho right now at an index of 51, which is Moderate, from fine particles (PM2.5). AirNow carries 26 reporting areas in the state. No air quality alert is in force.
- Reporting areas
- 26
- Worst index now
- 51
- Alerts in force
- 0
- Towns under smoke
- Unavailable
Radar
Reflectivity now over Idaho. Open it to see the particulate forecast on the map.
Radar mosaic and map layers from NOAA MRMS and NOAA National Air Quality Forecast Capability. Boundaries from the Iowa Environmental Mesonet.
Alerts in force
An Air Quality Alert is issued by the National Weather Service on behalf of a state or local agency when pollution is expected to reach a level that harms health. An Air Stagnation Advisory means the air will not move enough to clear what is already in it.
None are in force in Idaho right now. All Idaho warnings.
By city, now and the days ahead26
Every AirNow reporting area in Idaho: what its monitors measured this hour, and what the state or local agency that forecasts for it expects today and tomorrow. Each area links to the nearest town’s page.
| Reporting area | Now | Category now | Today | Tomorrow | Pollutant |
|---|---|---|---|---|---|
| Boise | 51 | Moderate | Good | Good | PM2.5 |
| Sandpoint | 46 | Good | Good | Good | PM2.5 |
| Weiser (seasonal) | 42 | Good | Not forecast | Not forecast | PM2.5 |
| Lewiston | 40 | Good | Good | Good | PM2.5 |
| Kootenai Tribe | 38 | Good | Not forecast | Not forecast | PM2.5 |
| St. Maries | 37 | Good | Good | Good | PM2.5 |
| Pinehurst | 35 | Good | Not forecast | Not forecast | PM2.5 |
| Coeur d'Alene | 33 | Good | Good | Good | PM2.5 |
| Mount Hall (seasonal) | 32 | Good | Good | Good | PM2.5 |
| Craters of the Moon National Monument | 31 | Good | Not forecast | Not forecast | Ozone |
| Pocatello | 29 | Good | Good | Good | PM2.5 |
| Juliaetta (seasonal) | 27 | Good | Not forecast | Not forecast | PM2.5 |
| Franklin County | 25 | Good | Good | Good | PM2.5 |
| Moscow | 22 | Good | Good | Good | PM2.5 |
| Twin Falls | 22 | Good | Good | Good | PM2.5 |
| Ketchum | 20 | Good | Good | Good | PM2.5 |
| Kamiah - Nez Perce Reservation | 19 | Good | Not forecast | Not forecast | Ozone |
| Porthill (seasonal) | 17 | Good | Good | Good | PM2.5 |
| Salmon | 17 | Good | Good | Good | PM2.5 |
| Idaho Falls | 15 | Good | Good | Good | PM2.5 |
| Lapwai - Nez Perce Reservation | 14 | Good | Not forecast | Not forecast | PM2.5 |
| McCall | 13 | Good | Good | Good | PM2.5 |
| Idaho City | 10 | Good | Good | Good | PM2.5 |
| Cottonwood (seasonal) | 6 | Good | Not forecast | Not forecast | PM2.5 |
| Garden Valley | 1 | Good | Not forecast | Not forecast | PM2.5 |
| Grangeville | 0 | Good | Good | Good | PM2.5 |
The forecaster’s discussion
Written by Idaho Department of Environmental Quality for Sandpoint and filed with AirNow.
Warm and dry weather is expected through the middle of next week with high temperatures through Tuesday in the mid 70s to low 80s. Air Quality is expected to be mostly in the GOOD category this weekend.
Smoke
NOAA’s Hazard Mapping System smoke analysis could not be read just now.
What this means
The index runs from 0 to 500. Good is 0 to 50, Moderate to 100, Unhealthy for Sensitive Groups to 150, Unhealthy to 200, Very Unhealthy to 300, and Hazardous above that. The figure reported for a place is the highest index among the pollutants measured there, and the pollutant that produced it is named beside it.
What these numbers are. An index beside a monitor’s name is a measurement, published hourly by AirNow and preliminary until the operating agency certifies it. A category for today or tomorrow is a state or local agency forecaster’s own forecast for a reporting area. An hourly index is NOAA’s air quality model on a five-kilometer grid, not a reading from any instrument. Where a town has no monitor within reach, only the model figures appear, and the page says so.
Towns
Air quality for any town in Idaho: what is measured nearby, the category forecast for today and tomorrow, and NOAA’s model hour by hour. Largest first.
- Boise235,684 people
- Meridian90,739 people
- Nampa89,839 people
- Idaho Falls59,184 people
- Pocatello54,441 people
- Caldwell51,686 people
- Coeur d'Alene49,122 people
- Twin Falls47,468 people
- Lewiston32,544 people
- Lewiston Orchards31,422 people
- Post Falls30,453 people
- Eagle Foothills30,000 people
- Rexburg27,663 people
- Moscow25,060 people
- Eagle23,612 people
- Conda21,260 people
- Kuna17,226 people
- Ammon14,960 people
- Chubbuck14,428 people
- Hayden14,133 people
- Mountain Home13,730 people
- Blackfoot11,740 people
- Garden City11,550 people
- Jerome11,184 people
- Burley10,436 people
- Hailey8,134 people
- Sandpoint7,835 people
- Star7,797 people
- Rathdrum7,538 people
- Payette7,380 people
- Middleton6,828 people
- Emmett6,604 people
- Rupert5,705 people
- Weiser5,317 people
- Preston5,212 people
- Fruitland5,087 people
- Shelley4,339 people
- American Falls4,321 people
- Buhl4,275 people
- Rigby4,029 people
- Lincoln3,647 people
- Kimberly3,610 people
- Saint Anthony3,542 people
- Gooding3,509 people
- Heyburn3,223 people
- Fort Hall3,201 people
- Grangeville3,155 people
- McCall3,106 people
- Orofino3,054 people
- Salmon3,036 people
- Soda Springs2,944 people
- Wendell2,744 people
- Ketchum2,728 people
- Filer2,691 people
- Homedale2,565 people
- Bonners Ferry2,549 people
- Montpelier2,509 people
- Saint Maries2,402 people
- Dalton Gardens2,386 people
- Bellevue2,300 people
- Hidden Spring2,280 people
- Spirit Lake2,086 people
- Parma2,082 people
- Kellogg2,069 people
- Iona2,056 people
- Malad City2,050 people
- Victor1,961 people
- Aberdeen1,929 people
- Priest River1,758 people
- Driggs1,689 people
- Wilder1,622 people
- Pinehurst1,580 people
- Osburn1,510 people
- New Plymouth1,503 people
- Shoshone1,488 people
- Sun Valley1,422 people
- Sugar City1,328 people
- Marsing1,287 people
- Moreland1,278 people
- Kamiah1,273 people
- Hansen1,249 people
- Glenns Ferry1,229 people
- Paul1,192 people
- Lapwai1,147 people
- Ponderay1,138 people
- Ucon1,132 people
- Tyhee1,123 people
- Ashton1,051 people
- Challis1,043 people
- Plummer1,019 people
Smaller places have pages too; search for one on the air quality landing page.
Sources
Observations and daily forecasts from AirNow, the US Environmental Protection Agency’s program with NOAA, the National Park Service, NASA, tribal, state and local agencies. Hourly forecasts from NOAA’s National Air Quality Forecast Capability. Smoke analysis from NOAA’s Hazard Mapping System. Alerts from the National Weather Service. Index categories and breakpoints are EPA’s, as revised in 2024.