Air Quality in North Dakota

North Dakota has 11 counties with EPA air quality monitoring. Air quality is stable across the state, with an average of 304 "Good" days per county per year. The best air quality is in Stutsman (median AQI 10) and the most polluted is Burleigh (median AQI 39).

County	Median AQI	Max AQI	Good Days	Unhealthy Days	Trend	Top Pollutant
Billings	38	172	303	10	→ stable	Ozone
Burke	38	178	304	10	↑ worsening	Ozone
Burleigh	39	174	268	10	→ stable	Ozone
Cass	38	158	288	2	→ stable	PM2.5
Dunn	37	157	304	8	→ stable	Ozone
McKenzie	39	172	300	8	→ stable	Ozone
Mercer	37	167	304	6	→ stable	Ozone
Oliver	38	162	299	7	→ stable	Ozone
Stutsman	10	75	352	0	↓ improving	PM10
Ward	37	152	298	9	↑ worsening	Ozone
Williams	34	77	324	0	↓ improving	Ozone