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

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

Floyd County had the highest median Air Quality Index (US EPA) of 32 counties in 2012, at 68. Rockdale County had the lowest, at 36. The median was 52. Source: the U.S. Environmental Protection Agency.

Keep it in a collection in your library.
Highest68Floyd County
Lowest36Rockdale County
Median5232 counties

Map of counties, 2012

Bibb County: 54 indexCharlton County: 36 indexChatham County: 51 indexChattooga County: 39 indexClarke County: 52 indexClayton County: 54 indexCobb County: 53 indexCoffee County: 47 indexColumbia County: 43 indexCoweta County: 48 indexDawson County: 40 indexDeKalb County: 61 indexDougherty County: 51 indexDouglas County: 43 indexFloyd County: 68 indexFulton County: 55 indexGlynn County: 36 indexGwinnett County: 52 indexHall County: 54 indexHenry County: 52 indexHouston County: 53 indexLowndes County: 57 indexMurray County: 43 indexMuscogee County: 51 indexPaulding County: 55 indexPike County: 41 indexRichmond County: 52 indexRockdale County: 36 indexSumter County: 40 indexWalker County: 55 indexWashington County: 47 indexWilkinson County: 53 index
  • Under 40
  • 40 to 47
  • 47 to 52
  • 52 to 53
  • 53 to 55
  • 55 and over
  • No data
index, 2012. 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, 2012

Floyd County: 68 indexFloyd County68DeKalb County: 61 indexDeKalb County61Lowndes County: 57 indexLowndes County57Fulton County: 55 indexFulton County55Paulding County: 55 indexPaulding County55Walker County: 55 indexWalker County55Bibb County: 54 indexBibb County54Clayton County: 54 indexClayton County54Hall County: 54 indexHall County54Cobb County: 53 indexCobb County53Houston County: 53 indexHouston County53Wilkinson County: 53 indexWilkinson County53Clarke County: 52 indexClarke County52Gwinnett County: 52 indexGwinnett County52Henry County: 52 indexHenry County52Richmond County: 52 indexRichmond County52Chatham County: 51 indexChatham County51Dougherty County: 51 indexDougherty County51Muscogee County: 51 indexMuscogee County51Coweta County: 48 indexCoweta County48Coffee County: 47 indexCoffee County47Washington County: 47 indexWashington County47Columbia County: 43 indexColumbia County43Douglas County: 43 indexDouglas County43Murray County: 43 indexMurray County43Pike County: 41 indexPike County41Dawson County: 40 indexDawson County40Sumter County: 40 indexSumter County40Chattooga County: 39 indexChattooga County39Charlton County: 36 indexCharlton County36Glynn County: 36 indexGlynn County36Rockdale County: 36 indexRockdale County36Floyd County: 68 indexFloyd County68DeKalb County: 61 indexDeKalb County61Lowndes County: 57 indexLowndes County57Fulton County: 55 indexFulton County55Paulding County: 55 indexPaulding County55Walker County: 55 indexWalker County55Bibb County: 54 indexBibb County54Clayton County: 54 indexClayton County54Hall County: 54 indexHall County54Cobb County: 53 indexCobb County53Houston County: 53 indexHouston County53Wilkinson County: 53 indexWilkinson County53Clarke County: 52 indexClarke County52Gwinnett County: 52 indexGwinnett County52Henry County: 52 indexHenry County52Richmond County: 52 indexRichmond County52Chatham County: 51 indexChatham County51Dougherty County: 51 indexDougherty County51Muscogee County: 51 indexMuscogee County51Coweta County: 48 indexCoweta County48Coffee County: 47 indexCoffee County47Washington County: 47 indexWashington County47Columbia County: 43 indexColumbia County43Douglas County: 43 indexDouglas County43Murray County: 43 indexMurray County43Pike County: 41 indexPike County41Dawson County: 40 indexDawson County40Sumter County: 40 indexSumter County40Chattooga County: 39 indexChattooga County39Charlton County: 36 indexCharlton County36Glynn County: 36 indexGlynn County36Rockdale County: 36 indexRockdale County36
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12.

Full ranking

RankCounties2012
index		Change on 2011
1Floyd County68+11
2DeKalb County61+3
3Lowndes County57-5
4Fulton County55-1
4Paulding County550
4Walker County55-4
7Bibb County54-3
7Clayton County54-2
7Hall County54-3
10Cobb County53-2
10Houston County53-5
10Wilkinson County53-3
13Clarke County52-1
13Gwinnett County52-4
13Henry County52-2
13Richmond County52-3
17Chatham County51-2
17Dougherty County51-8
17Muscogee County51-3
20Coweta County48-2
21Coffee County47-5
21Washington County47-4
23Columbia County43-3
23Douglas County43-1
23Murray County43-4
26Pike County41-1
27Dawson County40-4
27Sumter County40-4
29Chattooga County390
30Charlton County36-6
30Glynn County36-5
30Rockdale County36-2

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 2012 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), 2012) [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), 2012. 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=2012. 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), 2012. 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=2012.

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), 2012 [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=2012 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_georgia_by_2012,
  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), 2012}},
  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=2012. 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), 2012
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=2012
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-air-quality-index/georgia-counties?period=2012.
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)?

Floyd County, with 68 in 2012, according to the U.S. Environmental Protection Agency.

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

Rockdale County, with 36 in 2012.

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 2012 and are not ranked.

Median Air Quality Index (US EPA): other rankings

Counties in Georgia: more rankings