Counties in Alabama by share of days with good air quality (US EPA AQI)

Calhoun County had the highest share of days with good air quality (US EPA AQI) of 24 counties in 1992, at 100%. Jefferson County had the lowest, at 62.3%. The median was 97.4%. Source: EPA.

Highest100Calhoun County

Lowest62.3Jefferson County

Median97.424 counties

All counties, 1992

%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

Full ranking

Rank	Counties	1992 (%)	Change on 1991
1	Calhoun County	100	+8.8 pts
1	Colbert County	100	+3.5 pts
1	Franklin County	100	+6.4 pts
1	Jackson County	100	+7 pts
1	Marengo County	100	0 pts
1	Morgan County	100	+10 pts
1	Tuscaloosa County	100	+8.3 pts
1	Walker County	100	+7.3 pts
9	Montgomery County	98.4	+10.4 pts
10	Escambia County	98.3	+3.7 pts
10	Russell County	98.3	+3.7 pts
12	Pike County	98.2	-0.1 pts
13	Houston County	96.5	+3.5 pts
14	Clay County	95.1	-4.4 pts
15	Etowah County	93.4	+7.2 pts
16	Talladega County	91.7	+5.3 pts
17	Sumter County	80.6	-12.7 pts
18	Elmore County	77.6	-2.3 pts
19	Mobile County	76.2	-16.2 pts
20	DeKalb County	75.4	+2.6 pts
21	Madison County	75.1	+8 pts
22	Shelby County	74.4	-3.7 pts
23	Lawrence County	62.8	n/a
24	Jefferson County	62.3	-1.5 pts

Other periods

About this ranking

Days with a daily Air Quality Index of 0 to 50 (good) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; both counts are stored with each value.

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 1992 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: good days as a share of days with an AQI, calculated with stored counts. 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: good days as a share of days with an AQI, calculated with stored counts (Counties in Alabama by share of days with good air quality (US EPA AQI), 1992) [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: good days as a share of days with an AQI, calculated with stored counts, Counties in Alabama by share of days with good air quality (US EPA AQI), 1992. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/rankings/good-air-quality-days-share/alabama-counties?period=1992. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Counties in Alabama by share of days with good air quality (US EPA AQI), 1992. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/rankings/good-air-quality-days-share/alabama-counties?period=1992.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Counties in Alabama by share of days with good air quality (US EPA AQI), 1992 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/rankings/good-air-quality-days-share/alabama-counties?period=1992 (Accessed: 12 October 2026).

BibTeX

@misc{environmental_counties_in_alabama_by_1992,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Counties in Alabama by share of days with good air quality (US EPA AQI), 1992}},
  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/good-air-quality-days-share/alabama-counties?period=1992. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. 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: good days as a share of days with an AQI, calculated with stored counts: Counties in Alabama by share of days with good air quality (US EPA AQI), 1992
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/good-air-quality-days-share/alabama-counties?period=1992
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/rankings/good-air-quality-days-share/alabama-counties?period=1992.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -

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Rank Counties in Alabama by share of days with good air quality (US EPA AQI) using official data, and cite the source.

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Questions

Which county has the highest share of days with good air quality (US EPA AQI)?

Calhoun County, with 100% in 1992, according to EPA.

Which county has the lowest share of days with good air quality (US EPA AQI)?

Jefferson County, with 62.3% in 1992.

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: good days as a share of days with an AQI, calculated with stored counts. Retrieved 2026-10-12. 7 counties have no value for 1992 and are not ranked.