Air Quality in Virginia

Virginia has 36 counties with EPA air quality monitoring. Air quality is generally improving across the state, with an average of 228 "Good" days per county per year. The best air quality is in Pittsylvania (median AQI 3) and the most polluted is Loudoun (median AQI 43).

County	Median AQI	Max AQI	Good Days	Unhealthy Days	Trend	Top Pollutant
Albemarle	40	85	281	0	→ stable	PM2.5
Alexandria City	6	9	15	0	↓ improving	PM10
Arlington	36	115	309	4	→ stable	Ozone
Bristol City	33	63	99	0	→ stable	PM2.5
Caroline	37	77	220	0	→ stable	Ozone
Carroll	7	31	60	0	↓ improving	PM10
Charles	36	75	325	0	→ stable	PM2.5
Chesterfield	41	77	273	0	→ stable	PM2.5
Fairfax	42	112	263	3	→ stable	Ozone
Fauquier	36	64	226	0	→ stable	Ozone
Frederick	41	102	264	1	→ stable	PM2.5
Fredericksburg City	7	15	11	0	↓ improving	PM10
Giles	38	80	316	0	→ stable	Ozone
Hampton City	39	90	293	0	→ stable	PM2.5
Hanover	39	74	228	0	→ stable	Ozone
Henrico	41	112	289	1	→ stable	Ozone
Hopewell City	6	30	58	0	↓ improving	PM10
King William	8	20	29	0	↓ improving	PM10
Loudoun	43	87	245	0	→ stable	Ozone
Lynchburg City	28	61	102	0	↓ improving	PM2.5
Madison	41	90	313	0	→ stable	Ozone
Norfolk City	32	82	314	0	→ stable	PM2.5
Page	43	90	195	0	↓ improving	Ozone
Pittsylvania	3	28	363	0	↑ worsening	Ozone
Prince Edward	33	64	358	0	→ stable	Ozone
Prince William	35	87	339	0	→ stable	Ozone
Richmond City	36	79	290	0	→ stable	PM2.5
Roanoke	39	68	306	0	→ stable	PM2.5
Rockbridge	37	64	273	0	→ stable	Ozone
Rockingham	42	83	283	0	→ stable	PM2.5
Salem City	32	67	99	0	↓ improving	PM2.5
Stafford	35	90	353	0	→ stable	Ozone
Suffolk City	37	71	232	0	→ stable	Ozone
Virginia Beach City	36	81	294	0	→ stable	PM2.5
Winchester City	6	18	58	0	↓ improving	PM10
Wythe	41	67	236	0	→ stable	Ozone