Data / Highest daily Air Quality Index (US EPA) / Walker County

Highest daily Air Quality Index (US EPA) in Walker County

Highest daily Air Quality Index (US EPA) in Walker County was 86 in 2011, according to the U.S. Environmental Protection Agency. That is up 9 from 2010.

2011, index86
Change on 2010+9
Series high1662002
Series low431994

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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Highest daily Air Quality Index (US EPA) in Walker County, 1990 to 2011

25507510012515017519901993199619992003200620111990: 57 index1991: 66 index1992: 44 index1993: 58 index1994: 43 index1995: 58 index1996: 66 index1997: 43 index1998: 50 index1999: 116 index2000: 112 index2002: 166 index2003: 106 index2004: 94 index2005: 113 index2006: 112 index2007: 115 index2008: 96 index2009: 76 index2010: 77 index2011: 86 index05010015020019901997200520111990: 57 index1991: 66 index1992: 44 index1993: 58 index1994: 43 index1995: 58 index1996: 66 index1997: 43 index1998: 50 index1999: 116 index2000: 112 index2002: 166 index2003: 106 index2004: 94 index2005: 113 index2006: 112 index2007: 115 index2008: 96 index2009: 76 index2010: 77 index2011: 86 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 21 values
Periodindex
201186
201077
200976
200896
2007115
2006112
2005113
200494
2003106
2002166
2000112
1999116
199850
199743
199666
199558
199443
199358
199244
199166
199057

Walker County compared with nearby places

Baldwin County: 126 indexClay County: 88 indexColbert County: 101 indexDeKalb County: 101 indexElmore County: 105 indexEtowah County: 99 indexHouston County: 100 indexJefferson County: 182 indexLawrence County: 84 indexMadison County: 126 indexMobile County: 122 indexMontgomery County: 108 indexMorgan County: 115 indexRussell County: 126 indexShelby County: 166 indexSumter County: 93 indexTalladega County: 95 indexTuscaloosa County: 103 indexWalker County: 86 index
  • Under 94
  • 94 to 100
  • 100 to 110
  • 110 to 130
  • 130 and over
  • No data
Highest daily Air Quality Index (US EPA), 2011, index. Walker 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

Highest daily Air Quality Index (AQI) value recorded in a US county during the year, from the EPA AirData annual summaries. Values above 500 are beyond the AQI scale and are published as EPA computes them.

A single day decides the value, so one wildfire or dust event can set it. Dust from the dry Owens Lake bed puts Inyo and Mono counties in California in the thousands. 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: highest 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: highest daily AQI (Highest daily Air Quality Index (US EPA), Walker County, 1990 to 2011) [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: highest daily AQI, Highest daily Air Quality Index (US EPA), Walker County, 1990 to 2011. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/highest-daily-air-quality-index/walker-county-alabama. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: highest daily AQI. Highest daily Air Quality Index (US EPA), Walker County, 1990 to 2011. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/highest-daily-air-quality-index/walker-county-alabama.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Walker County, 1990 to 2011 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/walker-county-alabama (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2011,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Walker County, 1990 to 2011}},
  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/highest-daily-air-quality-index/walker-county-alabama. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest 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: highest daily AQI: Highest daily Air Quality Index (US EPA), Walker County, 1990 to 2011
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/highest-daily-air-quality-index/walker-county-alabama
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/walker-county-alabama.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest 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 highest daily Air Quality Index (US EPA) in Walker County?

Highest daily Air Quality Index (US EPA) in Walker County was 86 in 2011, according to the U.S. Environmental Protection Agency. That is up 9 from 2010.

Where does this figure come from?

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

What was the highest highest daily Air Quality Index (US EPA) in Walker County?

166 in 2002, the highest value since 1990 in this series.

Related statistics for Walker County

All statistics for Walker County | Walker County in figures