SmogRank / World / United States / Utah / 2025
Most polluted cities in Utah, United States, 2025
21 cities in Utah, United States ranked by their average PM2.5 over the 365 days; 18 above the WHO annual guideline (5.0 µg/m³). Worst: Millcreek at 9.2 µg/m³, #1,237 of 2,624 cities in the world. Cleanest: Price at 4.2. A city needs measurements on 70% of the days to be ranked.
Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.
- 1Stansbury park 0%
- 2West Valley City 0%
- 3Millcreek 0%
- 4West Jordan 0%
- 5Orem 0%
- 6Moab 0%
- 7Salt Lake City 0%
- 8Spanish Fork 0%
- 9Bountiful 0%
- 10Smithfield 0%
- 11Magna 0%
- 12Enoch 0%
- 12Cedar Hills 0%
- 12Roosevelt 0%
- 15North Ogden 0%
- 16Herriman 0%
- 17Brigham City 0%
- 18Heber City 0%
- 19Hurricane 0%
- 20Vernal 0%
- 21Price 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
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SmogRank, most polluted cities in Utah, United States, PM2.5, 2025, smogrank.com/us/region/utah/history/2025 (accessed 6 Oct 2026).
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.