Data / Share of days with good air quality (US EPA AQI) / Winn Parish

Share of days with good air quality (US EPA AQI) in Winn Parish

Share of days with good air quality (US EPA AQI) in Winn Parish was 63.5% in 2010, according to EPA. That is down 11.3 pts from 2009.

201063.5%
Change on 2009-11.3 pts
Series high74.82009
Series low42.92001

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 Winn Parish, 2001 to 2010

4050607080200120032005200720102001: 42.9 %2002: 61.1 %2003: 51.7 %2004: 64.1 %2005: 47.5 %2006: 58.6 %2007: 52.7 %2008: 61.3 %2009: 74.8 %2010: 63.5 %40506070802001200520102001: 42.9 %2002: 61.1 %2003: 51.7 %2004: 64.1 %2005: 47.5 %2006: 58.6 %2007: 52.7 %2008: 61.3 %2009: 74.8 %2010: 63.5 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 10 values
Period%
201063.5
200974.8
200861.3
200752.7
200658.6
200547.5
200464.1
200351.7
200261.1
200142.9

Winn Parish compared with nearby places

Ascension Parish: 83.6 %Bossier Parish: 45.9 %Caddo Parish: 64.2 %Calcasieu Parish: 40.3 %East Baton Rouge Parish: 24.9 %Iberville Parish: 61.1 %Jefferson Parish: 37.5 %Lafayette Parish: 22.2 %Lafourche Parish: 58.2 %Livingston Parish: 52.1 %Orleans Parish: 52.9 %Ouachita Parish: 58.4 %Pointe Coupee Parish: 79 %Rapides Parish: 58.8 %St. Bernard Parish: 22.5 %St. Charles Parish: 84.8 %St. James Parish: 86.2 %St. John the Baptist Parish: 81.4 %St. Tammany Parish: 50.6 %Tangipahoa Parish: 55.7 %Terrebonne Parish: 59.2 %West Baton Rouge Parish: 26 %Winn Parish: 63.5 %
  • Under 39
  • 39 to 53
  • 53 to 59
  • 59 to 73
  • 73 and over
  • No data
Share of days with good air quality (US EPA AQI), 2010, %. Winn Parish 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), Winn Parish, 2001 to 2010) [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), Winn Parish, 2001 to 2010. 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/winn-parish-louisiana. 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), Winn Parish, 2001 to 2010. 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/winn-parish-louisiana.

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), Winn Parish, 2001 to 2010 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/winn-parish-louisiana (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2010,
  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), Winn Parish, 2001 to 2010}},
  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/winn-parish-louisiana. 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), Winn Parish, 2001 to 2010
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/winn-parish-louisiana
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/winn-parish-louisiana.
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 Winn Parish?

Share of days with good air quality (US EPA AQI) in Winn Parish was 63.5% in 2010, according to EPA. That is down 11.3 pts from 2009.

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 Winn Parish?

74.8% in 2009, the highest value since 2001 in this series.

Related statistics for Winn Parish

All statistics for Winn Parish | Winn Parish in figures