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

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

Jefferson County had the highest median Air Quality Index (US EPA) of 24 counties in 1993, at 45. Pike County had the lowest, at 19. The median was 28. Source: the U.S. Environmental Protection Agency.

Keep it in a collection in your library.
Highest45Jefferson County
Lowest19Pike County
Median2824 counties

Map of counties, 1993

Calhoun County: 23 indexClay County: 44 indexColbert County: 21 indexDeKalb County: 44 indexElmore County: 44 indexEscambia County: 23 indexEtowah County: 31 indexFranklin County: 19 indexHouston County: 21 indexJackson County: 21 indexJefferson County: 45 indexLawrence County: 44 indexMadison County: 44 indexMarengo County: 22 indexMobile County: 36 indexMontgomery County: 31 indexMorgan County: 43 indexPike County: 19 indexRussell County: 23 indexShelby County: 40 indexSumter County: 37 indexTalladega County: 25 indexTuscaloosa County: 23 indexWalker County: 23 index
  • Under 22
  • 22 to 23
  • 23 to 35
  • 35 to 44
  • 44 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

Jefferson County: 45 indexJefferson County45Clay County: 44 indexClay County44DeKalb County: 44 indexDeKalb County44Elmore County: 44 indexElmore County44Lawrence County: 44 indexLawrence County44Madison County: 44 indexMadison County44Morgan County: 43 indexMorgan County43Shelby County: 40 indexShelby County40Sumter County: 37 indexSumter County37Mobile County: 36 indexMobile County36Etowah County: 31 indexEtowah County31Montgomery County: 31 indexMontgomery County31Talladega County: 25 indexTalladega County25Calhoun County: 23 indexCalhoun County23Escambia County: 23 indexEscambia County23Russell County: 23 indexRussell County23Tuscaloosa County: 23 indexTuscaloosa County23Walker County: 23 indexWalker County23Marengo County: 22 indexMarengo County22Colbert County: 21 indexColbert County21Houston County: 21 indexHouston County21Jackson County: 21 indexJackson County21Franklin County: 19 indexFranklin County19Pike County: 19 indexPike County19Jefferson County: 45 indexJefferson County45Clay County: 44 indexClay County44DeKalb County: 44 indexDeKalb County44Elmore County: 44 indexElmore County44Lawrence County: 44 indexLawrence County44Madison County: 44 indexMadison County44Morgan County: 43 indexMorgan County43Shelby County: 40 indexShelby County40Sumter County: 37 indexSumter County37Mobile County: 36 indexMobile County36Etowah County: 31 indexEtowah County31Montgomery County: 31 indexMontgomery County31Talladega County: 25 indexTalladega County25Calhoun County: 23 indexCalhoun County23Escambia County: 23 indexEscambia County23Russell County: 23 indexRussell County23Tuscaloosa County: 23 indexTuscaloosa County23Walker County: 23 indexWalker County23Marengo County: 22 indexMarengo County22Colbert County: 21 indexColbert County21Houston County: 21 indexHouston County21Jackson County: 21 indexJackson County21Franklin County: 19 indexFranklin County19Pike County: 19 indexPike County19
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12.

Full ranking

RankCounties1993
index		Change on 1992
1Jefferson County45+2
2Clay County44+19
2DeKalb County44+6
2Elmore County44+3
2Lawrence County44+5
2Madison County44+6
7Morgan County43+22
8Shelby County40-1
9Sumter County37-2
10Mobile County36-2
11Etowah County31+5
11Montgomery County31+10
13Talladega County25-2
14Calhoun County23+1
14Escambia County23-1
14Russell County230
14Tuscaloosa County23+2
14Walker County23+1
19Marengo County22+1
20Colbert County21+2
20Houston County21+1
20Jackson County21-2
23Franklin County190
23Pike County190

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 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 Alabama 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 Alabama 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/alabama-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 Alabama 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/alabama-counties?period=1993.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Counties in Alabama 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/alabama-counties?period=1993 (Accessed: 12 October 2026).

BibTeX
@misc{environmental_counties_in_alabama_by_1993,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Counties in Alabama 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/alabama-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 Alabama 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/alabama-counties?period=1993
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/median-air-quality-index/alabama-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 Alabama 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)?

Jefferson County, with 45 in 1993, according to the U.S. Environmental Protection Agency.

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

Pike County, with 19 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. 7 counties have no value for 1993 and are not ranked.

Median Air Quality Index (US EPA): other rankings

Counties in Alabama: more rankings