Data / Share of days with good air quality (US EPA AQI) / Colbert County

Share of days with good air quality (US EPA AQI) in Colbert County

Share of days with good air quality (US EPA AQI) in Colbert County was 90.5% in 2019, according to EPA. That is up 5.7 pts from 2018.

201990.5%
Change on 2018+5.7 pts
Series high1001992
Series low12.21999

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

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Share of days with good air quality (US EPA AQI) in Colbert County, 1990 to 2019

02040608010019901995200020052010201520191990: 96.6 %1991: 96.5 %1992: 100 %1993: 98.3 %1994: 66.7 %1995: 78.2 %1996: 100 %1997: 100 %1998: 100 %1999: 12.2 %2000: 17 %2001: 36 %2002: 62.9 %2003: 62.1 %2004: 64.5 %2005: 53.6 %2006: 54.6 %2007: 52.7 %2008: 63.2 %2009: 49.8 %2010: 34.9 %2011: 67.7 %2012: 72.1 %2013: 78.9 %2014: 78.9 %2015: 78.9 %2016: 85.5 %2017: 86.2 %2018: 84.8 %2019: 90.5 %025507510019902000201020191990: 96.6 %1991: 96.5 %1992: 100 %1993: 98.3 %1994: 66.7 %1995: 78.2 %1996: 100 %1997: 100 %1998: 100 %1999: 12.2 %2000: 17 %2001: 36 %2002: 62.9 %2003: 62.1 %2004: 64.5 %2005: 53.6 %2006: 54.6 %2007: 52.7 %2008: 63.2 %2009: 49.8 %2010: 34.9 %2011: 67.7 %2012: 72.1 %2013: 78.9 %2014: 78.9 %2015: 78.9 %2016: 85.5 %2017: 86.2 %2018: 84.8 %2019: 90.5 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 30 values
Period%
201990.5
201884.8
201786.2
201685.5
201578.9
201478.9
201378.9
201272.1
201167.7
201034.9
200949.8
200863.2
200752.7
200654.6
200553.6
200464.5
200362.1
200262.9
200136
200017
199912.2
1998100
1997100
1996100
199578.2
199466.7
199398.3
1992100
199196.5
199096.6

Colbert County compared with nearby places

Baldwin County: 81.5 %Clay County: 70.1 %Colbert County: 90.5 %DeKalb County: 83.9 %Elmore County: 91.2 %Etowah County: 72 %Houston County: 82.1 %Jefferson County: 23.3 %Lawrence County: 87.5 %Madison County: 52.4 %Mobile County: 47.4 %Montgomery County: 23 %Morgan County: 67.7 %Russell County: 53.7 %Shelby County: 82.8 %Sumter County: 81.1 %Tuscaloosa County: 82.2 %
  • Under 53
  • 53 to 71
  • 71 to 82
  • 82 to 84
  • 84 and over
  • No data
Share of days with good air quality (US EPA AQI), 2019, %. Colbert County is outlined. Same source and period for every area shown. Source: U.S. Environmental Protection Agency. Boundaries: U.S. Census Bureau cartographic boundary files.

Rankings

Definition

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.

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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 (Share of days with good air quality (US EPA AQI), Colbert County, 1990 to 2019) [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, Share of days with good air quality (US EPA AQI), Colbert County, 1990 to 2019. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/good-air-quality-days-share/colbert-county-alabama. 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. Share of days with good air quality (US EPA AQI), Colbert County, 1990 to 2019. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/good-air-quality-days-share/colbert-county-alabama.

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, Share of days with good air quality (US EPA AQI), Colbert County, 1990 to 2019 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/colbert-county-alabama (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2019,
  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: Share of days with good air quality (US EPA AQI), Colbert County, 1990 to 2019}},
  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/en/good-air-quality-days-share/colbert-county-alabama. 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: Share of days with good air quality (US EPA AQI), Colbert County, 1990 to 2019
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/en/good-air-quality-days-share/colbert-county-alabama
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/colbert-county-alabama.
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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Questions

What is the share of days with good air quality (US EPA AQI) in Colbert County?

Share of days with good air quality (US EPA AQI) in Colbert County was 90.5% in 2019, according to EPA. That is up 5.7 pts from 2018.

Where does this figure come from?

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 by Invokely on 2026-10-12.

What was the highest share of days with good air quality (US EPA AQI) in Colbert County?

100% in 1992, the highest value since 1990 in this series.

Related statistics for Colbert County

All statistics for Colbert County | Colbert County in figures