Data / Share of days unhealthy for sensitive groups or worse (US EPA AQI) / Douglas County

Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Douglas County

Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Douglas County was 0% in 2022, according to EPA. That is down 1.4 pts from 2021. That is the 21st highest of 23 counties in 2022.

20220%
Change on 2021-1.4 pts
Rank21st of 23Counties in Oregon ranked
Series high251990
Series low01991

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Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Douglas County, 1990 to 2022

051015202519901994200720112015201920221990: 25 %1991: 0 %1992: 0 %1993: 0 %1994: 0 %1995: 0 %2005: 0 %2006: 0.3 %2007: 0 %2008: 0 %2009: 0.6 %2010: 0 %2011: 0 %2012: 0 %2013: 0 %2014: 0 %2015: 0.3 %2016: 0 %2017: 1.9 %2018: 0.6 %2019: 0 %2020: 2.7 %2021: 1.4 %2022: 0 %010203019902007201520221990: 25 %1991: 0 %1992: 0 %1993: 0 %1994: 0 %1995: 0 %2005: 0 %2006: 0.3 %2007: 0 %2008: 0 %2009: 0.6 %2010: 0 %2011: 0 %2012: 0 %2013: 0 %2014: 0 %2015: 0.3 %2016: 0 %2017: 1.9 %2018: 0.6 %2019: 0 %2020: 2.7 %2021: 1.4 %2022: 0 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 24 values
Period%
20220
20211.4
20202.7
20190
20180.6
20171.9
20160
20150.3
20140
20130
20120
20110
20100
20090.6
20080
20070
20060.3
20050
19950
19940
19930
19920
19910
199025

Douglas County compared with nearby places

Baker County: 0.8 %Benton County: 0 %Clackamas County: 1.4 %Columbia County: 0.8 %Crook County: 0.6 %Deschutes County: 1.6 %Douglas County: 0 %Grant County: 0.3 %Harney County: 0.5 %Jackson County: 2.2 %Jefferson County: 0.3 %Josephine County: 4.1 %Klamath County: 1.1 %Lake County: 1.1 %Lane County: 10.7 %Linn County: 0.5 %Marion County: 1.9 %Multnomah County: 1.4 %Umatilla County: 0.8 %Union County: 1.1 %Wallowa County: 2.3 %Wasco County: 0 %Washington County: 0.8 %
  • Under 0.4
  • 0.4 to 0.8
  • 0.8 to 1.1
  • 1.1 to 1.8
  • 1.8 and over
  • No data
Share of days unhealthy for sensitive groups or worse (US EPA AQI), 2022, %. Douglas 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 above 100 (unhealthy for sensitive groups, unhealthy, very unhealthy or hazardous) 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; the counts are stored with each value.

Use the share rather than the number of days to compare counties, since the days with an AQI differ. 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: days with an AQI above 100 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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts (Share of days unhealthy for sensitive groups or worse (US EPA AQI), Douglas County, 1990 to 2022) [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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts, Share of days unhealthy for sensitive groups or worse (US EPA AQI), Douglas County, 1990 to 2022. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/unhealthy-air-quality-days-share/douglas-county-oregon. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts. Share of days unhealthy for sensitive groups or worse (US EPA AQI), Douglas County, 1990 to 2022. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/unhealthy-air-quality-days-share/douglas-county-oregon.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts, Share of days unhealthy for sensitive groups or worse (US EPA AQI), Douglas County, 1990 to 2022 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/unhealthy-air-quality-days-share/douglas-county-oregon (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_unhealthy_2022,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts: Share of days unhealthy for sensitive groups or worse (US EPA AQI), Douglas County, 1990 to 2022}},
  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/unhealthy-air-quality-days-share/douglas-county-oregon. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: days with an AQI above 100 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: days with an AQI above 100 as a share of days with an AQI, calculated with stored counts: Share of days unhealthy for sensitive groups or worse (US EPA AQI), Douglas County, 1990 to 2022
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/unhealthy-air-quality-days-share/douglas-county-oregon
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/unhealthy-air-quality-days-share/douglas-county-oregon.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: days with an AQI above 100 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 unhealthy for sensitive groups or worse (US EPA AQI) in Douglas County?

Share of days unhealthy for sensitive groups or worse (US EPA AQI) in Douglas County was 0% in 2022, according to EPA. That is down 1.4 pts from 2021. That is the 21st highest of 23 counties in 2022.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: days with an AQI above 100 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 unhealthy for sensitive groups or worse (US EPA AQI) in Douglas County?

25% in 1990, the highest value since 1990 in this series.

Related statistics for Douglas County

All statistics for Douglas County | Douglas County in figures