Air Quality in Oklahoma

Oklahoma has 35 counties with EPA air quality monitoring. Air quality is stable across the state, with an average of 183 "Good" days per county per year. The best air quality is in Grady (median AQI 8) and the most polluted is Nowata (median AQI 54).

County	Median AQI	Max AQI	Good Days	Unhealthy Days	Trend	Top Pollutant
Adair	47	138	209	4	→ stable	PM2.5
Bryan	38	119	257	3	↓ improving	Ozone
Caddo	35	58	107	0	↓ improving	Ozone
Canadian	44	119	204	8	↑ worsening	Ozone
Carter	48	143	217	14	→ stable	Ozone
Cherokee	39	71	261	0	↓ improving	Ozone
Choctaw	37	90	238	0	↓ improving	Ozone
Cleveland	51	126	177	9	→ stable	Ozone
Comanche	43	339	242	7	→ stable	Ozone
Cotton	39	90	238	0	↓ improving	Ozone
Creek	44	179	202	4	→ stable	Ozone
Custer	14	58	235	0	↓ improving	PM10
Dewey	47	112	221	6	→ stable	Ozone
Ellis	31	94	75	0	↓ improving	PM2.5
Grady	8	20	94	0	↓ improving	Ozone
Grant	32	86	92	0	↑ worsening	PM2.5
Jefferson	42	108	247	3	→ stable	Ozone
Johnston	44	119	192	3	→ stable	Ozone
Kay	42	193	223	5	→ stable	PM2.5
Kiowa	44	115	185	2	↑ worsening	Ozone
Le Flore	36	82	31	0	↓ improving	PM2.5
Lincoln	27	53	16	0	↓ improving	PM2.5
Love	45	150	196	8	→ stable	Ozone
Mayes	40	112	261	1	→ stable	Ozone
McClain	46	133	172	10	↑ worsening	Ozone
Muskogee	18	169	117	2	↓ improving	PM10
Nowata	54	140	132	4	↑ worsening	PM2.5
Oklahoma	52	147	172	11	→ stable	PM2.5
Osage	44	112	223	5	→ stable	Ozone
Ottawa	51	288	181	1	→ stable	PM2.5
Pittsburg	48	105	198	2	→ stable	PM2.5
Pontotoc	43	101	207	1	↑ worsening	Ozone
Sequoyah	44	97	252	0	→ stable	PM2.5
Tulsa	51	140	177	8	→ stable	Ozone
Washington	47	156	182	8	→ stable	Ozone