Air quality in Virginia
EPA monitors report from 32 of Virginia’s 133 counties. That is the honest limit of this page: the other 101 are not measured, not clean. In 2025 the most affected monitored county was Arlington County, with 2 days above the moderate category.
32
Counties with monitors
101
Counties without
7
Days above moderate, 2025
Summed across monitored counties
10.4%
Adults with asthma
Population-weighted county estimate
County by county
Monitored Virginia counties
GoodModerateUnhealthy for sensitive groupsUnhealthyVery unhealthyHazardous
| County | 90th %ile AQI | Above moderate | Max AQI | 2025 days by category |
|---|---|---|---|---|
| Arlington County | 54 | 2 | 140 | |
| Charles City County | 51 | 1 | 101 | |
| Fairfax city | 59 | 1 | 124 | |
| Hampton city | 53 | 1 | 105 | |
| Loudoun County | 58 | 1 | 120 | |
| Suffolk city | 47 | 1 | 101 | |
| Albemarle County | 56 | 0 | 77 | |
| Alexandria city | 7 | 0 | 9 | |
| Bristol city | 55 | 0 | 61 | |
| Caroline County | 45 | 0 | 74 | |
| Carroll County | 16 | 0 | 19 | |
| Chesterfield County | 55 | 0 | 80 | |
| Fauquier County | 44 | 0 | 77 | |
| Frederick County | 58 | 0 | 85 | |
| Giles County | 47 | 0 | 80 | |
| Hanover County | 46 | 0 | 77 | |
| Henrico County | 55 | 0 | 85 | |
| Hopewell city | 11 | 0 | 15 | |
| Lynchburg city | 53 | 0 | 69 | |
| Madison County | 58 | 0 | 87 | |
| Norfolk city | 53 | 0 | 94 | |
| Pittsylvania County | 7 | 0 | 28 | |
| Prince Edward County | 44 | 0 | 67 | |
| Prince William County | 46 | 0 | 87 | |
| Richmond city | 54 | 0 | 77 | |
| Roanoke city | 55 | 0 | 80 | |
| Rockbridge County | 46 | 0 | 67 | |
| Rockingham County | 56 | 0 | 80 | |
| Salem city | 54 | 0 | 76 | |
| Stafford County | 46 | 0 | 77 | |
| Virginia Beach city | 55 | 0 | 98 | |
| Wythe County | 48 | 0 | 77 |
EPA Air Quality System annual summaries by county, 2025. The 90th percentile AQI describes a day worse than nine out of ten, which is a steadier measure than the annual maximum a single wildfire can set.
Not measured
101 counties without a monitor
No EPA monitor reported from these counties, so there is no air quality record to publish. Their radon zone is known, and radon is measured in the building rather than the air outside it.
- Accomack County
- Alleghany County
- Amelia County
- Amherst County
- Appomattox County
- Augusta County
- Bath County
- Bedford County
- Bland County
- Botetourt County
- Brunswick County
- Buchanan County
- Buckingham County
- Buena Vista city
- Campbell County
- Charlotte County
- Charlottesville city
- Chesapeake city
- Clarke County
- Colonial Heights city
- Covington city
- Craig County
- Culpeper County
- Cumberland County
- Danville city
- Dickenson County
- Dinwiddie County
- Emporia city
- Essex County
- Fairfax County
- Falls Church city
- Floyd County
- Fluvanna County
- Franklin city
- Franklin County
- Fredericksburg city
- Galax city
- Gloucester County
- Goochland County
- Grayson County
- Greene County
- Greensville County
- Halifax County
- Harrisonburg city
- Henry County
- Highland County
- Isle of Wight County
- James City County
- King and Queen County
- King George County
- King William County
- Lancaster County
- Lee County
- Lexington city
- Louisa County
- Lunenburg County
- Manassas city
- Manassas Park city
- Martinsville city
- Mathews County
- Mecklenburg County
- Middlesex County
- Montgomery County
- Nelson County
- New Kent County
- Newport News city
- Northampton County
- Northumberland County
- Norton city
- Nottoway County
- Orange County
- Page County
- Patrick County
- Petersburg city
- Poquoson city
- Portsmouth city
- Powhatan County
- Prince George County
- Pulaski County
- Radford city
- Rappahannock County
- Richmond County
- Roanoke County
- Russell County
- Scott County
- Shenandoah County
- Smyth County
- Southampton County
- Spotsylvania County
- Staunton city
- Surry County
- Sussex County
- Tazewell County
- Warren County
- Washington County
- Waynesboro city
- Westmoreland County
- Williamsburg city
- Winchester city
- Wise County
- York County
Other states
Air quality elsewhere
- Alabama
- Alaska
- Arizona
- Arkansas
- California
- Colorado
- Connecticut
- Delaware
- Florida
- Georgia
- Hawaii
- Idaho
- Illinois
- Indiana
- Iowa
- Kansas
- Kentucky
- Louisiana
- Maine
- Maryland
- Massachusetts
- Michigan
- Minnesota
- Mississippi
- Missouri
- Montana
- Nebraska
- Nevada
- New Hampshire
- New Jersey
- New Mexico
- New York
- North Carolina
- North Dakota
- Ohio
- Oklahoma
- Oregon
- Pennsylvania
- Rhode Island
- South Carolina
- South Dakota
- Tennessee
- Texas
- Utah
- Vermont
- Washington
- West Virginia
- Wisconsin
- Wyoming