Air Quality Rankings for Utah 2026

Utah has 15 cities with EPA air quality data. Wayne, Utah has the cleanest air with a 5-year average AQI of 11. Salt Lake, Utah has the highest AQI at 57.

#	City	5yr Avg AQI	Current AQI	Worst Pollutant	Trend	Grade
1	Wayne, Utah	11	12	PM2.5	Stable	B
2	Garfield, Utah	36	10	Ozone	Improving	B
3	Box Elder, Utah	39	38	Ozone	Improving	B
4	Iron, Utah	42	42	Ozone	Improving	B
5	Carbon, Utah	44	42	Ozone	Stable	B
6	Tooele, Utah	44	45	Ozone	Worsening	C
7	San Juan, Utah	44	45	Ozone	Stable	C
8	Washington, Utah	44	43	Ozone	Stable	C
9	Weber, Utah	46	47	Ozone	Improving	C
10	Davis, Utah	46	47	Ozone	Worsening	C
11	Cache, Utah	47	48	Ozone	Stable	C
12	Duchesne, Utah	48	51	Ozone	Worsening	C
13	Utah, Utah	48	48	Ozone	Stable	C
14	Uintah, Utah	51	54	Ozone	Worsening	D
15	Salt Lake, Utah	57	54	Ozone	Worsening	D

Air quality data for Utah is sourced from the EPA Air Quality System (AQS), which monitors outdoor air quality at thousands of stations nationwide.
— EPA Air Quality System

Frequently Asked Questions

Wayne, Utah has the best air quality in Utah with a 5-year average AQI of 11 and a grade of B.

Utah has 15 cities with EPA air quality monitoring data in our database, covering multiple years of AQI measurements.

The Air Quality Index (AQI) measures five major pollutants: ground-level ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. Lower AQI values indicate cleaner air — 0-50 is "Good," while 150+ is "Unhealthy."

Sources: EPA Air Quality System (AQS)

Cities ranked by 5-year average AQI (lower is better). Grades factor in average AQI, trend direction, unhealthy days, and dominant pollutant.

Cleanest Cities Nationwide →All Air Quality in Utah →