Air Quality in West Virginia

West Virginia has 15 counties with EPA air quality monitoring. Air quality is generally improving across the state, with an average of 205 "Good" days per county per year. The best air quality is in Raleigh (median AQI 32) and the most polluted is Cabell (median AQI 43).

County	Median AQI	Max AQI	Good Days	Unhealthy Days	Trend	Top Pollutant
Berkeley	42	97	217	0	→ stable	Ozone
Brooke	36	72	277	0	↑ worsening	PM2.5
Cabell	43	87	253	0	→ stable	PM2.5
Gilmer	37	71	108	0	→ stable	Ozone
Greenbrier	40	64	234	0	→ stable	Ozone
Hancock	41	97	262	0	→ stable	PM2.5
Harrison	34	60	91	0	↓ improving	PM2.5
Kanawha	40	90	283	0	→ stable	PM2.5
Marion	33	62	85	0	↓ improving	PM2.5
Marshall	39	81	267	0	→ stable	PM2.5
Monongalia	43	93	211	0	→ stable	Ozone
Ohio	41	84	219	0	→ stable	Ozone
Raleigh	32	53	20	0	↓ improving	PM2.5
Tucker	37	71	343	0	→ stable	Ozone
Wood	43	101	219	1	→ stable	Ozone