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

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

Share of days with good air quality (US EPA AQI) in Tuscaloosa County was 73.6% in 2025, according to EPA. That is down 15 pts from 2024. That is the 16th highest of 24 counties in 2005.

202573.6%
Change on 2024-15 pts
Rank16th of 24Counties in Alabama ranked
Series high1001992
Series low12.92010

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Share of days with good air quality (US EPA AQI) in Tuscaloosa County, 1980 to 2025

02040608010019801992199820042010201620251980: 71.2 %1981: 74.1 %1982: 65.8 %1989: 95.2 %1990: 87.5 %1991: 91.7 %1992: 100 %1993: 96.3 %1994: 100 %1995: 95.1 %1996: 94.4 %1997: 96.7 %1998: 100 %1999: 14.8 %2000: 19.6 %2001: 72.7 %2002: 76.6 %2003: 63.4 %2004: 62.5 %2005: 51.5 %2006: 49.8 %2007: 49.3 %2008: 68.9 %2009: 56.2 %2010: 12.9 %2011: 73.8 %2012: 79.9 %2013: 80.8 %2014: 80 %2015: 26.3 %2016: 29.3 %2017: 26.3 %2018: 69.7 %2019: 82.2 %2020: 88.8 %2021: 87.9 %2022: 85.7 %2023: 69.9 %2024: 88.6 %2025: 73.6 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 40 values
Period%
202573.6
202488.6
202369.9
202285.7
202187.9
202088.8
201982.2
201869.7
201726.3
201629.3
201526.3
201480
201380.8
201279.9
201173.8
201012.9
200956.2
200868.9
200749.3
200649.8
200551.5
200462.5
200363.4
200276.6
200172.7
200019.6
199914.8
1998100
199796.7
199694.4
199595.1
1994100
199396.3
1992100
199191.7
199087.5
198995.2
198265.8
198174.1
198071.2

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.

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), Tuscaloosa County, 1980 to 2025) [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), Tuscaloosa County, 1980 to 2025. 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/tuscaloosa-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), Tuscaloosa County, 1980 to 2025. 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/tuscaloosa-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), Tuscaloosa County, 1980 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/tuscaloosa-county-alabama (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2025,
  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), Tuscaloosa County, 1980 to 2025}},
  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/tuscaloosa-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), Tuscaloosa County, 1980 to 2025
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/tuscaloosa-county-alabama
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/tuscaloosa-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 Tuscaloosa County?

Share of days with good air quality (US EPA AQI) in Tuscaloosa County was 73.6% in 2025, according to EPA. That is down 15 pts from 2024. That is the 16th highest of 24 counties in 2005.

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 Tuscaloosa County?

100% in 1992, the highest value since 1980 in this series.

Related statistics for Tuscaloosa County

All statistics for Tuscaloosa County | Tuscaloosa County in figures