Data / Rankings / Median Air Quality Index (US EPA) / Counties in Virginia

Counties in Virginia by median Air Quality Index (US EPA)

Hanover County had the highest median Air Quality Index (US EPA) of 44 counties in 1993, at 67. Newport News city had the lowest, at 11. The median was 40. Source: the U.S. Environmental Protection Agency.

Keep it in a collection in your library.
Highest67Hanover County
Lowest11Newport News city
Median4044 counties

Map of counties, 1993

Amherst County: 51 indexArlington County: 47 indexAugusta County: 47 indexCampbell County: 17 indexCaroline County: 44 indexCarroll County: 20 indexCharles City County: 46 indexChesterfield County: 51 indexCulpeper County: 17 indexFairfax County: 52 indexFauquier County: 50 indexFrederick County: 46 indexGiles County: 49 indexHanover County: 67 indexHenrico County: 49 indexIsle of Wight County: 21 indexKing William County: 18 indexLoudoun County: 14 indexMadison County: 46 indexNorthumberland County: 16 indexPrince Edward County: 41 indexPrince William County: 48 indexRoanoke County: 40 indexSmyth County: 19 indexStafford County: 48 indexWarren County: 44 indexWythe County: 67 indexYork County: 19 indexAlexandria city: 47 indexBristol city: 21 indexCharlottesville city: 20 indexChesapeake city: 19 indexCovington city: 26 indexFairfax city: 20 indexFredericksburg city: 17 indexHampton city: 48 indexLynchburg city: 22 indexMartinsville city: 20 indexNewport News city: 11 indexNorfolk city: 38 indexRichmond city: 39 indexRoanoke city: 15 indexSuffolk city: 54 indexWinchester city: 19 index
  • Under 18
  • 18 to 20
  • 20 to 40
  • 40 to 47
  • 47 to 49
  • 49 and over
  • No data
index, 1993. Hatched areas have no value for this period. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Boundaries: U.S. Census Bureau cartographic boundary files.

All counties, 1993

Hanover County: 67 indexHanover County67Wythe County: 67 indexWythe County67Suffolk city: 54 indexSuffolk city54Fairfax County: 52 indexFairfax County52Amherst County: 51 indexAmherst County51Chesterfield County: 51 indexChesterfield County51Fauquier County: 50 indexFauquier County50Giles County: 49 indexGiles County49Henrico County: 49 indexHenrico County49Hampton city: 48 indexHampton city48Prince William County: 48 indexPrince William County48Stafford County: 48 indexStafford County48Alexandria city: 47 indexAlexandria city47Arlington County: 47 indexArlington County47Augusta County: 47 indexAugusta County47Charles City County: 46 indexCharles City County46Frederick County: 46 indexFrederick County46Madison County: 46 indexMadison County46Caroline County: 44 indexCaroline County44Warren County: 44 indexWarren County44Prince Edward County: 41 indexPrince Edward County41Roanoke County: 40 indexRoanoke County40Richmond city: 39 indexRichmond city39Norfolk city: 38 indexNorfolk city38Covington city: 26 indexCovington city26Lynchburg city: 22 indexLynchburg city22Bristol city: 21 indexBristol city21Isle of Wight County: 21 indexIsle of Wight County21Carroll County: 20 indexCarroll County20Charlottesville city: 20 indexCharlottesville city20Fairfax city: 20 indexFairfax city20Martinsville city: 20 indexMartinsville city20Chesapeake city: 19 indexChesapeake city19Smyth County: 19 indexSmyth County19Winchester city: 19 indexWinchester city19York County: 19 indexYork County19King William County: 18 indexKing William County18Campbell County: 17 indexCampbell County17Culpeper County: 17 indexCulpeper County17Fredericksburg city: 17 indexFredericksburg city17Northumberland County: 16 indexNorthumberland County16Roanoke city: 15 indexRoanoke city15Loudoun County: 14 indexLoudoun County14Newport News city: 11 indexNewport News city11Hanover County: 67 indexHanover County67Wythe County: 67 indexWythe County67Suffolk city: 54 indexSuffolk city54Fairfax County: 52 indexFairfax County52Amherst County: 51 indexAmherst County51Chesterfield County: 51 indexChesterfield County51Fauquier County: 50 indexFauquier County50Giles County: 49 indexGiles County49Henrico County: 49 indexHenrico County49Hampton city: 48 indexHampton city48Prince William County: 48 indexPrince William County48Stafford County: 48 indexStafford County48Alexandria city: 47 indexAlexandria city47Arlington County: 47 indexArlington County47Augusta County: 47 indexAugusta County47Charles City County: 46 indexCharles City County46Frederick County: 46 indexFrederick County46Madison County: 46 indexMadison County46Caroline County: 44 indexCaroline County44Warren County: 44 indexWarren County44Prince Edward County: 41 indexPrince Edward County41Roanoke County: 40 indexRoanoke County40Richmond city: 39 indexRichmond city39Norfolk city: 38 indexNorfolk city38Covington city: 26 indexCovington city26Lynchburg city: 22 indexLynchburg city22Bristol city: 21 indexBristol city21Isle of Wight County: 21 indexIsle of Wight County21Carroll County: 20 indexCarroll County20Charlottesville city: 20 indexCharlottesville city20Fairfax city: 20 indexFairfax city20Martinsville city: 20 indexMartinsville city20Chesapeake city: 19 indexChesapeake city19Smyth County: 19 indexSmyth County19Winchester city: 19 indexWinchester city19York County: 19 indexYork County19King William County: 18 indexKing William County18Campbell County: 17 indexCampbell County17Culpeper County: 17 indexCulpeper County17Fredericksburg city: 17 indexFredericksburg city17Northumberland County: 16 indexNorthumberland County16Roanoke city: 15 indexRoanoke city15Loudoun County: 14 indexLoudoun County14Newport News city: 11 indexNewport News city11
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12.

Full ranking

RankCounties1993
index		Change on 1992
1Hanover County67+20
1Wythe County67+22
3Suffolk city54+8
4Fairfax County520
5Amherst County51+5
5Chesterfield County51+7
7Fauquier County50+5
8Giles County49+7
8Henrico County49+7
10Hampton city48+6
10Prince William County48+10
10Stafford County48+13
13Alexandria city47+4
13Arlington County47+5
13Augusta County47+14
16Charles City County46+1
16Frederick County46+2
16Madison County46+2
19Caroline County44n/a
19Warren County44+7
21Prince Edward County41+3
22Roanoke County40+3
23Richmond city39+2
24Norfolk city38+2
25Covington city26+4
26Lynchburg city22+2
27Bristol city210
27Isle of Wight County21n/a
29Carroll County20-1
29Charlottesville city20+1
29Fairfax city20-13
29Martinsville city20+1
33Chesapeake city190
33Smyth County190
33Winchester city19-1
33York County19+1
37King William County18+3
38Campbell County17-2
38Culpeper County17-2
38Fredericksburg city17-1
41Northumberland County16-2
42Roanoke city15-17
43Loudoun County14-3
44Newport News city110

Other periods

About this ranking

Median of the daily Air Quality Index (AQI) values of a US county over the days of the year with an AQI, from the EPA AirData annual summaries.

More on how it is measured
  • The daily county AQI is the highest AQI among the monitors and pollutants reported that day (ozone, PM2.5, PM10, carbon monoxide and nitrogen dioxide).
  • Lower is cleaner: 0 to 50 is good, 51 to 100 moderate and above 100 unhealthy for sensitive groups.

United States counties with air quality monitors only, about 1,000 of some 3,100 in recent years; a county without monitors has no value. The number of days with an AQI differs between counties because some monitors run only in the ozone season.

Every value in the ranking comes from the same publisher and the same period, so the counties are compared on one definition. 16 counties with data in other periods have no value for 1993 and are left out rather than filled from another source. Equal values share a rank.

How to cite

U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.

Citation styles

The publisher is the author. Invokely is named only as the place the figures were read, where a style asks for it.

APA 7

U.S. Environmental Protection Agency. (2026). EPA AirData annual AQI by county: median daily AQI (Counties in Virginia by median Air Quality Index (US EPA), 1993) [Data set]. Retrieved October 12, 2026, from https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual

MLA 9

EPA AirData annual AQI by county: median daily AQI, Counties in Virginia by median Air Quality Index (US EPA), 1993. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/median-air-quality-index/virginia-counties?period=1993. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Counties in Virginia by median Air Quality Index (US EPA), 1993. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/median-air-quality-index/virginia-counties?period=1993.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Counties in Virginia by median Air Quality Index (US EPA), 1993 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/median-air-quality-index/virginia-counties?period=1993 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_virginia_by_1993,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Counties in Virginia by median Air Quality Index (US EPA), 1993}},
  year = {2026},
  howpublished = {Data set},
  url = {https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual},
  urldate = {2026-10-12},
  note = {Accessed via Invokely, https://invokely.ai/rankings/median-air-quality-index/virginia-counties?period=1993. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download\_files.html\#Annual. Retrieved 2026-10-12.},
}
RIS
TY  - DATA
AU  - U.S. Environmental Protection Agency
TI  - EPA AirData annual AQI by county: median daily AQI: Counties in Virginia by median Air Quality Index (US EPA), 1993
PY  - 2026
DA  - 2026/07/13
PB  - U.S. Environmental Protection Agency
DB  - Invokely
UR  - https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual
L2  - https://invokely.ai/rankings/median-air-quality-index/virginia-counties?period=1993
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-air-quality-index/virginia-counties?period=1993.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: median daily AQI. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Rank Counties in Virginia by median Air Quality Index (US EPA) using official data, and cite the source.
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Questions

Which county has the highest median Air Quality Index (US EPA)?

Hanover County, with 67 in 1993, according to the U.S. Environmental Protection Agency.

Which county has the lowest median Air Quality Index (US EPA)?

Newport News city, with 11 in 1993.

Where does this ranking come from?

Every value comes from one source and one period, so the places are comparable: U.S. Environmental Protection Agency, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12. 16 counties have no value for 1993 and are not ranked.

Median Air Quality Index (US EPA): other rankings

Counties in Virginia: more rankings