SmogRank / World / North America / United States / Utah
Most polluted cities in Utah, United States
21 measured cities, this year; 17 above the WHO annual guideline. Worst: Millcreek at 8.9 µg/m³, #1,371 in the world.
About 0 people in these 2 cities breathed unhealthy air on an average day so far this year.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
- 1Salt Lake City 0
- 2Magna 0
The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales
Estimated: cities without a monitor
Utah cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.
| City | 7-day estimate |
|---|---|
| Provo | ≈ 4 µg/m³ |
| Sandy | ≈ 9 µg/m³ |
| Ogden | ≈ 5 µg/m³ |
| Layton | ≈ 5 µg/m³ |
| Saint George | ≈ 2 µg/m³ |
| South Jordan | ≈ 9 µg/m³ |
| Taylorsville | ≈ 7 µg/m³ |
| Lehi | ≈ 9 µg/m³ |
| Logan | ≈ 4 µg/m³ |
| Murray | ≈ 7 µg/m³ |
| Draper | ≈ 9 µg/m³ |
| Riverton | ≈ 9 µg/m³ |
| Pleasant Grove | ≈ 4 µg/m³ |
| Roy | ≈ 5 µg/m³ |
| Kearns | ≈ 7 µg/m³ |
| Cottonwood Heights | ≈ 7 µg/m³ |
| Tooele | ≈ 11 µg/m³ |
| Midvale | ≈ 7 µg/m³ |
| Springville | ≈ 5 µg/m³ |
| Holladay | ≈ 7 µg/m³ |
| Clearfield | ≈ 5 µg/m³ |
| Kaysville | ≈ 5 µg/m³ |
| Cedar City | ≈ 2 µg/m³ |
| American Fork | ≈ 4 µg/m³ |
| Syracuse | ≈ 5 µg/m³ |
| Eagle Mountain | ≈ 9 µg/m³ |
| Saratoga Springs | ≈ 9 µg/m³ |
| South Salt Lake | ≈ 7 µg/m³ |
| Washington | ≈ 2 µg/m³ |
| Farmington | ≈ 7 µg/m³ |
| Clinton | ≈ 5 µg/m³ |
| East Millcreek | ≈ 7 µg/m³ |
| North Salt Lake | ≈ 7 µg/m³ |
| Payson | ≈ 5 µg/m³ |
| Highland | ≈ 4 µg/m³ |
| South Ogden | ≈ 5 µg/m³ |
| Centerville | ≈ 7 µg/m³ |
Bad-air episodes in Utah
- North-western United States and Canada, 4 to 22 August 202619 days151 cities204 µg/m³peak, Wenatchee
- North-western United States and Canada, July and August 202616 July to 4 August 2026, 20 days118 cities168 µg/m³peak, Prineville
- Utah and Colorado, United States, June 202623 to 24 June 2026, 2 days16 cities66 µg/m³peak, Delta
- North-western United States, October 20246 to 8 October 2024, 3 days11 cities84 µg/m³peak, Sheridan
- North-western United States and Canada, 4 to 11 September 20248 days63 cities87 µg/m³peak, Prineville
- Nevada and Utah, United States, September 202411 September 2024, 1 day8 cities85 µg/m³peak, Boulder City
Times when many cities around here had PM2.5 at twice their usual or more on the same days.
Use this board
SmogRank, most polluted cities in Utah, United States, PM2.5, this year to 6 Oct 2026, 22:00 UTC, smogrank.com/us/region/utah?w=year.
You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.
Updated 2026-10-06 22:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.