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

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

DeKalb County had the highest median Air Quality Index (US EPA) of 32 counties in 2010, at 61. Rockdale County had the lowest, at 36. The median was 54. Source: the U.S. Environmental Protection Agency.

Keep it in a collection in your library.
Highest61DeKalb County
Lowest36Rockdale County
Median5432 counties

Map of counties, 2010

Bibb County: 58 indexCharlton County: 39 indexChatham County: 52 indexChattooga County: 41 indexClarke County: 54 indexClayton County: 58 indexCobb County: 56 indexCoffee County: 48 indexColumbia County: 44 indexCoweta County: 53 indexDawson County: 43 indexDeKalb County: 61 indexDougherty County: 56 indexDouglas County: 45 indexFloyd County: 61 indexFulton County: 58 indexGlynn County: 42 indexGwinnett County: 54 indexHall County: 60 indexHenry County: 53 indexHouston County: 57 indexLowndes County: 59 indexMurray County: 45 indexMuscogee County: 55 indexPaulding County: 52 indexPike County: 41 indexRichmond County: 54 indexRockdale County: 36 indexSumter County: 42 indexWalker County: 57 indexWashington County: 52 indexWilkinson County: 57 index
  • Under 42
  • 42 to 49
  • 49 to 54
  • 54 to 56
  • 56 to 58
  • 58 and over
  • No data
index, 2010. 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, 2010

DeKalb County: 61 indexDeKalb County61Floyd County: 61 indexFloyd County61Hall County: 60 indexHall County60Lowndes County: 59 indexLowndes County59Bibb County: 58 indexBibb County58Clayton County: 58 indexClayton County58Fulton County: 58 indexFulton County58Houston County: 57 indexHouston County57Walker County: 57 indexWalker County57Wilkinson County: 57 indexWilkinson County57Cobb County: 56 indexCobb County56Dougherty County: 56 indexDougherty County56Muscogee County: 55 indexMuscogee County55Clarke County: 54 indexClarke County54Gwinnett County: 54 indexGwinnett County54Richmond County: 54 indexRichmond County54Coweta County: 53 indexCoweta County53Henry County: 53 indexHenry County53Chatham County: 52 indexChatham County52Paulding County: 52 indexPaulding County52Washington County: 52 indexWashington County52Coffee County: 48 indexCoffee County48Douglas County: 45 indexDouglas County45Murray County: 45 indexMurray County45Columbia County: 44 indexColumbia County44Dawson County: 43 indexDawson County43Glynn County: 42 indexGlynn County42Sumter County: 42 indexSumter County42Chattooga County: 41 indexChattooga County41Pike County: 41 indexPike County41Charlton County: 39 indexCharlton County39Rockdale County: 36 indexRockdale County36DeKalb County: 61 indexDeKalb County61Floyd County: 61 indexFloyd County61Hall County: 60 indexHall County60Lowndes County: 59 indexLowndes County59Bibb County: 58 indexBibb County58Clayton County: 58 indexClayton County58Fulton County: 58 indexFulton County58Houston County: 57 indexHouston County57Walker County: 57 indexWalker County57Wilkinson County: 57 indexWilkinson County57Cobb County: 56 indexCobb County56Dougherty County: 56 indexDougherty County56Muscogee County: 55 indexMuscogee County55Clarke County: 54 indexClarke County54Gwinnett County: 54 indexGwinnett County54Richmond County: 54 indexRichmond County54Coweta County: 53 indexCoweta County53Henry County: 53 indexHenry County53Chatham County: 52 indexChatham County52Paulding County: 52 indexPaulding County52Washington County: 52 indexWashington County52Coffee County: 48 indexCoffee County48Douglas County: 45 indexDouglas County45Murray County: 45 indexMurray County45Columbia County: 44 indexColumbia County44Dawson County: 43 indexDawson County43Glynn County: 42 indexGlynn County42Sumter County: 42 indexSumter County42Chattooga County: 41 indexChattooga County41Pike County: 41 indexPike County41Charlton County: 39 indexCharlton County39Rockdale County: 36 indexRockdale County36
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12.

Full ranking

RankCounties2010
index		Change on 2009
1DeKalb County61+4
1Floyd County61+4
3Hall County60+5
4Lowndes County59+3
5Bibb County58+3
5Clayton County58+3
5Fulton County58-1
8Houston County570
8Walker County57+2
8Wilkinson County57+5
11Cobb County56+2
11Dougherty County56-1
13Muscogee County55+3
14Clarke County54+2
14Gwinnett County540
14Richmond County54+1
17Coweta County53+2
17Henry County53+1
19Chatham County520
19Paulding County52+4
19Washington County520
22Coffee County48-2
23Douglas County45+7
23Murray County45+4
25Columbia County44+6
26Dawson County43+5
27Glynn County42+4
27Sumter County42+7
29Chattooga County41+6
29Pike County41+4
31Charlton County39+1
32Rockdale County36+7

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. 7 counties with data in other periods have no value for 2010 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 Georgia by median Air Quality Index (US EPA), 2010) [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 Georgia by median Air Quality Index (US EPA), 2010. 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/georgia-counties?period=2010. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Counties in Georgia by median Air Quality Index (US EPA), 2010. 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/georgia-counties?period=2010.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Counties in Georgia by median Air Quality Index (US EPA), 2010 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/median-air-quality-index/georgia-counties?period=2010 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_georgia_by_2010,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Counties in Georgia by median Air Quality Index (US EPA), 2010}},
  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/georgia-counties?period=2010. 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 Georgia by median Air Quality Index (US EPA), 2010
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/georgia-counties?period=2010
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-air-quality-index/georgia-counties?period=2010.
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 Georgia 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)?

DeKalb County, with 61 in 2010, according to the U.S. Environmental Protection Agency.

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

Rockdale County, with 36 in 2010.

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. 7 counties have no value for 2010 and are not ranked.

Median Air Quality Index (US EPA): other rankings

Counties in Georgia: more rankings