Air Quality in Minnesota

Minnesota has 23 counties with EPA air quality monitoring. Air quality is generally worsening across the state, with an average of 249 "Good" days per county per year. The best air quality is in Cook (median AQI 16) and the most polluted is Blue Earth (median AQI 45).

County	Median AQI	Max AQI	Good Days	Unhealthy Days	Trend	Top Pollutant
Anoka	41	125	286	1	→ stable	Ozone
Becker	36	152	304	2	↑ worsening	PM2.5
Beltrami	36	177	308	4	↑ worsening	PM2.5
Blue Earth	45	80	90	0	↑ worsening	PM2.5
Carlton	34	114	326	1	→ stable	PM2.5
Cass	27	164	313	1	↑ worsening	PM2.5
Cook	16	138	333	3	↓ improving	PM2.5
Crow Wing	38	137	298	1	↑ worsening	PM2.5
Dakota	38	152	258	1	→ stable	PM2.5
Goodhue	38	67	232	0	→ stable	Ozone
Hennepin	42	166	243	4	→ stable	PM2.5
Lake	32	110	330	1	→ stable	PM2.5
Lyon	40	142	276	2	↑ worsening	PM2.5
Mille Lacs	36	67	73	0	↑ worsening	Ozone
Olmsted	44	155	234	1	→ stable	PM2.5
Ramsey	36	128	265	1	→ stable	PM2.5
Rock	29	85	100	0	↓ improving	PM2.5
Saint Louis	39	114	286	3	→ stable	Ozone
Scott	42	138	258	1	↑ worsening	PM2.5
Stearns	39	97	282	0	↑ worsening	PM2.5
Washington	35	58	241	0	↓ improving	Ozone
Winona	20	63	114	0	→ stable	PM2.5
Wright	41	110	277	3	↑ worsening	PM2.5