Data / Median Air Quality Index (US EPA) / Colbert County

Median Air Quality Index (US EPA) in Colbert County

Median Air Quality Index (US EPA) in Colbert County was 38 in 2019, according to the U.S. Environmental Protection Agency. That is up 1 from 2018.

2019, index38
Change on 2018+1
Series high641999
Series low141996

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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Median Air Quality Index (US EPA) in Colbert County, 1990 to 2019

1020304050607019901995200020052010201520191990: 19 index1991: 20 index1992: 19 index1993: 21 index1994: 42 index1995: 35 index1996: 14 index1997: 16 index1998: 20 index1999: 64 index2000: 63 index2001: 55 index2002: 44 index2003: 46 index2004: 45 index2005: 49 index2006: 48 index2007: 49 index2008: 45 index2009: 51 index2010: 54 index2011: 44 index2012: 43 index2013: 40 index2014: 39 index2015: 39 index2016: 41 index2017: 39 index2018: 37 index2019: 38 index02040608019902000201020191990: 19 index1991: 20 index1992: 19 index1993: 21 index1994: 42 index1995: 35 index1996: 14 index1997: 16 index1998: 20 index1999: 64 index2000: 63 index2001: 55 index2002: 44 index2003: 46 index2004: 45 index2005: 49 index2006: 48 index2007: 49 index2008: 45 index2009: 51 index2010: 54 index2011: 44 index2012: 43 index2013: 40 index2014: 39 index2015: 39 index2016: 41 index2017: 39 index2018: 37 index2019: 38 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 30 values
Periodindex
201938
201837
201739
201641
201539
201439
201340
201243
201144
201054
200951
200845
200749
200648
200549
200445
200346
200244
200155
200063
199964
199820
199716
199614
199535
199442
199321
199219
199120
199019

Colbert County compared with nearby places

Baldwin County: 40 indexClay County: 41 indexColbert County: 38 indexDeKalb County: 39 indexElmore County: 39 indexEtowah County: 44 indexHouston County: 38 indexJefferson County: 58 indexLawrence County: 32 indexMadison County: 49 indexMobile County: 52 indexMontgomery County: 57 indexMorgan County: 45 indexRussell County: 48 indexShelby County: 42 indexSumter County: 38 indexTuscaloosa County: 39 index
  • Under 38
  • 38 to 39
  • 39 to 43
  • 43 to 49
  • 49 and over
  • No data
Median Air Quality Index (US EPA), 2019, index. 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

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.

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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 (Median Air Quality Index (US EPA), 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: median daily AQI, Median Air Quality Index (US EPA), 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/median-air-quality-index/colbert-county-alabama. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: median daily AQI. Median Air Quality Index (US EPA), 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/median-air-quality-index/colbert-county-alabama.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Colbert County, 1990 to 2019 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/colbert-county-alabama (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2019,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), 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/median-air-quality-index/colbert-county-alabama. 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: Median Air Quality Index (US EPA), 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/median-air-quality-index/colbert-county-alabama
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/colbert-county-alabama.
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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Questions

What is the median Air Quality Index (US EPA) in Colbert County?

Median Air Quality Index (US EPA) in Colbert County was 38 in 2019, according to the U.S. Environmental Protection Agency. That is up 1 from 2018.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: median daily AQI. Retrieved by Invokely on 2026-10-12.

What was the highest median Air Quality Index (US EPA) in Colbert County?

64 in 1999, the highest value since 1990 in this series.

Related statistics for Colbert County

All statistics for Colbert County | Colbert County in figures