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 2015, at 56. Rockdale County had the lowest, at 31. The median was 45. Source: the U.S. Environmental Protection Agency.

Keep it in a collection in your library.
Highest56DeKalb County
Lowest31Rockdale County
Median4532 counties

Map of counties, 2015

Bibb County: 48 indexCharlton County: 32 indexChatham County: 44 indexChattooga County: 36 indexClarke County: 44 indexClayton County: 51 indexCobb County: 50 indexCoffee County: 38 indexColumbia County: 37 indexCoweta County: 42 indexDawson County: 38 indexDeKalb County: 56 indexDougherty County: 53 indexDouglas County: 37 indexFloyd County: 52 indexFulton County: 55 indexGlynn County: 38 indexGwinnett County: 45 indexHall County: 55 indexHenry County: 42 indexHouston County: 47 indexLowndes County: 51 indexMurray County: 38 indexMuscogee County: 45 indexPaulding County: 51 indexPike County: 35 indexRichmond County: 46 indexRockdale County: 31 indexSumter County: 34 indexWalker County: 51 indexWashington County: 43 indexWilkinson County: 51 index
  • Under 37
  • 37 to 39
  • 39 to 45
  • 45 to 49
  • 49 to 51
  • 51 and over
  • No data
index, 2015. 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, 2015

DeKalb County: 56 indexDeKalb County56Fulton County: 55 indexFulton County55Hall County: 55 indexHall County55Dougherty County: 53 indexDougherty County53Floyd County: 52 indexFloyd County52Clayton County: 51 indexClayton County51Lowndes County: 51 indexLowndes County51Paulding County: 51 indexPaulding County51Walker County: 51 indexWalker County51Wilkinson County: 51 indexWilkinson County51Cobb County: 50 indexCobb County50Bibb County: 48 indexBibb County48Houston County: 47 indexHouston County47Richmond County: 46 indexRichmond County46Gwinnett County: 45 indexGwinnett County45Muscogee County: 45 indexMuscogee County45Chatham County: 44 indexChatham County44Clarke County: 44 indexClarke County44Washington County: 43 indexWashington County43Coweta County: 42 indexCoweta County42Henry County: 42 indexHenry County42Coffee County: 38 indexCoffee County38Dawson County: 38 indexDawson County38Glynn County: 38 indexGlynn County38Murray County: 38 indexMurray County38Columbia County: 37 indexColumbia County37Douglas County: 37 indexDouglas County37Chattooga County: 36 indexChattooga County36Pike County: 35 indexPike County35Sumter County: 34 indexSumter County34Charlton County: 32 indexCharlton County32Rockdale County: 31 indexRockdale County31DeKalb County: 56 indexDeKalb County56Fulton County: 55 indexFulton County55Hall County: 55 indexHall County55Dougherty County: 53 indexDougherty County53Floyd County: 52 indexFloyd County52Clayton County: 51 indexClayton County51Lowndes County: 51 indexLowndes County51Paulding County: 51 indexPaulding County51Walker County: 51 indexWalker County51Wilkinson County: 51 indexWilkinson County51Cobb County: 50 indexCobb County50Bibb County: 48 indexBibb County48Houston County: 47 indexHouston County47Richmond County: 46 indexRichmond County46Gwinnett County: 45 indexGwinnett County45Muscogee County: 45 indexMuscogee County45Chatham County: 44 indexChatham County44Clarke County: 44 indexClarke County44Washington County: 43 indexWashington County43Coweta County: 42 indexCoweta County42Henry County: 42 indexHenry County42Coffee County: 38 indexCoffee County38Dawson County: 38 indexDawson County38Glynn County: 38 indexGlynn County38Murray County: 38 indexMurray County38Columbia County: 37 indexColumbia County37Douglas County: 37 indexDouglas County37Chattooga County: 36 indexChattooga County36Pike County: 35 indexPike County35Sumter County: 34 indexSumter County34Charlton County: 32 indexCharlton County32Rockdale County: 31 indexRockdale County31
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12.

Full ranking

RankCounties2015
index		Change on 2014
1DeKalb County560
2Fulton County55+3
2Hall County550
4Dougherty County53-1
5Floyd County52-8
6Clayton County51-2
6Lowndes County510
6Paulding County51-3
6Walker County51-1
6Wilkinson County51-2
11Cobb County50-2
12Bibb County48-6
13Houston County47-8
14Richmond County46-6
15Gwinnett County45-4
15Muscogee County45-6
17Chatham County44-8
17Clarke County44-8
19Washington County43-9
20Coweta County42-3
20Henry County42-6
22Coffee County38-9
22Dawson County38+1
22Glynn County38-6
22Murray County38-1
26Columbia County37-3
26Douglas County37-4
28Chattooga County360
29Pike County35-2
30Sumter County34-4
31Charlton County32-2
32Rockdale County31-3

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 2015 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), 2015) [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), 2015. 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=2015. 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), 2015. 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=2015.

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), 2015 [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=2015 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_georgia_by_2015,
  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), 2015}},
  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=2015. 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), 2015
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=2015
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-air-quality-index/georgia-counties?period=2015.
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.
rank_places {"indicator":"aqi_median","level":"province","within":"Georgia","limit":10}
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Questions

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

DeKalb County, with 56 in 2015, according to the U.S. Environmental Protection Agency.

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

Rockdale County, with 31 in 2015.

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 2015 and are not ranked.

Median Air Quality Index (US EPA): other rankings

Counties in Georgia: more rankings