Air Quality Rankings for Oklahoma 2026

Oklahoma has 22 cities with EPA air quality data. Custer, Oklahoma has the cleanest air with a 5-year average AQI of 14. Oklahoma, Oklahoma has the highest AQI at 53.

#	City	5yr Avg AQI	Current AQI	Worst Pollutant	Trend	Grade
1	Custer, Oklahoma	14	14	PM10	Stable	A
2	Muskogee, Oklahoma	18	18	PM10	Improving	A
3	Grant, Oklahoma	28	32	PM2.5	Worsening	C
4	Mayes, Oklahoma	37	42	Ozone	Stable	B
5	Creek, Oklahoma	39	44	Ozone	Worsening	C
6	Canadian, Oklahoma	40	45	Ozone	Worsening	C
7	Osage, Oklahoma	40	43	Ozone	Worsening	C
8	Johnston, Oklahoma	41	46	Ozone	Worsening	C
9	Sequoyah, Oklahoma	41	46	PM2.5	Worsening	C
10	Adair, Oklahoma	42	51	PM2.5	Stable	C
11	Love, Oklahoma	44	45	Ozone	Worsening	C
12	McClain, Oklahoma	44	48	Ozone	Worsening	C
13	Carter, Oklahoma	45	48	PM2.5	Worsening	C
14	Dewey, Oklahoma	45	46	PM2.5	Stable	C
15	Comanche, Oklahoma	46	46	Ozone	Stable	C
16	Washington, Oklahoma	47	51	PM2.5	Worsening	C
17	Pittsburg, Oklahoma	47	49	PM2.5	Worsening	C
18	Kay, Oklahoma	48	49	PM2.5	Improving	B
19	Cleveland, Oklahoma	51	52	PM2.5	Worsening	C
20	Ottawa, Oklahoma	51	54	PM2.5	Worsening	C
21	Tulsa, Oklahoma	51	53	PM2.5	Stable	C
22	Oklahoma, Oklahoma	53	53	PM2.5	Worsening	C

Air quality data for Oklahoma 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

Custer, Oklahoma has the best air quality in Oklahoma with a 5-year average AQI of 14 and a grade of A.

Oklahoma has 22 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 Oklahoma →