Air Quality in Michigan

Michigan has 29 counties with EPA air quality monitoring. Air quality is stable across the state, with an average of 220 "Good" days per county per year. The best air quality is in Keweenaw (median AQI 12) and the most polluted is Wayne (median AQI 55).

County	Median AQI	Max AQI	Good Days	Unhealthy Days	Trend	Top Pollutant
Allegan	46	115	222	4	→ stable	PM2.5
Bay	37	73	277	0	↓ improving	PM2.5
Benzie	38	101	216	2	→ stable	Ozone
Berrien	41	101	200	1	→ stable	Ozone
Cass	42	108	205	1	→ stable	Ozone
Chippewa	43	66	42	0	↓ improving	PM2.5
Clinton	38	80	228	0	→ stable	Ozone
Genesee	42	119	252	1	→ stable	PM2.5
Huron	38	119	216	1	→ stable	Ozone
Ingham	39	85	281	0	→ stable	Ozone
Kalamazoo	45	100	234	0	→ stable	PM2.5
Kent	51	112	180	1	→ stable	PM2.5
Keweenaw	12	66	118	0	→ stable	PM2.5
Lenawee	43	97	253	0	→ stable	PM2.5
Macomb	42	115	259	3	→ stable	PM2.5
Manistee	33	105	125	1	→ stable	Ozone
Marquette	19	67	202	0	↑ worsening	PM2.5
Mason	37	97	218	0	→ stable	Ozone
Missaukee	35	84	337	0	↑ worsening	Ozone
Monroe	18	77	56	0	↓ improving	PM10
Muskegon	38	122	203	4	→ stable	Ozone
Oakland	45	101	181	1	→ stable	Ozone
Ottawa	41	105	257	1	↑ worsening	Ozone
Schoolcraft	33	93	317	0	→ stable	PM2.5
St. Clair	41	134	261	3	→ stable	PM2.5
Tuscola	34	84	331	0	→ stable	Ozone
Washtenaw	43	87	253	0	→ stable	Ozone
Wayne	55	181	120	8	→ stable	PM2.5
Wexford	34	80	341	0	→ stable	Ozone