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

Median Air Quality Index (US EPA) in Douglas County

Median Air Quality Index (US EPA) in Douglas County was 22 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged from 2024. That is the 9th highest of 9 counties in 2025.

2025, index22
Change on 20240
Rank9th of 9Counties in Nevada ranked
Series high471991
Series low82010

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 Douglas County, 1981 to 2025

0102030405019811988199520022009201620251981: 39 index1982: 33 index1983: 22 index1984: 40 index1985: 36 index1986: 40 index1987: 45 index1988: 44 index1989: 34 index1990: 39 index1991: 47 index1992: 41 index1993: 41 index1994: 44 index1995: 42 index1996: 44 index1997: 44 index1998: 43 index1999: 45 index2000: 45 index2001: 45 index2002: 46 index2003: 44 index2004: 22 index2005: 15 index2006: 14 index2007: 10 index2008: 11 index2009: 9 index2010: 8 index2011: 10 index2012: 14 index2013: 43 index2014: 37 index2015: 41 index2016: 34 index2017: 26 index2018: 21 index2019: 17 index2020: 22 index2021: 24 index2022: 20 index2023: 28 index2024: 22 index2025: 22 index0102030405019811996201120251981: 39 index1982: 33 index1983: 22 index1984: 40 index1985: 36 index1986: 40 index1987: 45 index1988: 44 index1989: 34 index1990: 39 index1991: 47 index1992: 41 index1993: 41 index1994: 44 index1995: 42 index1996: 44 index1997: 44 index1998: 43 index1999: 45 index2000: 45 index2001: 45 index2002: 46 index2003: 44 index2004: 22 index2005: 15 index2006: 14 index2007: 10 index2008: 11 index2009: 9 index2010: 8 index2011: 10 index2012: 14 index2013: 43 index2014: 37 index2015: 41 index2016: 34 index2017: 26 index2018: 21 index2019: 17 index2020: 22 index2021: 24 index2022: 20 index2023: 28 index2024: 22 index2025: 22 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 45 values
Periodindex
202522
202422
202328
202220
202124
202022
201917
201821
201726
201634
201541
201437
201343
201214
201110
20108
20099
200811
200710
200614
200515
200422
200344
200246
200145
200045
199945
199843
199744
199644
199542
199444
199341
199241
199147
199039
198934
198844
198745
198640
198536
198440
198322
198233
198139

Douglas County compared with nearby places

Churchill County: 40 indexClark County: 61 indexDouglas County: 22 indexElko County: 42 indexLyon County: 41 indexNye County: 26 indexWashoe County: 50 indexWhite Pine County: 45 indexCarson City: 42 index
  • Under 34
  • 34 to 41
  • 41 to 42
  • 42 to 47
  • 47 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. 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

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), Douglas County, 1981 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: median daily AQI, Median Air Quality Index (US EPA), Douglas County, 1981 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/median-air-quality-index/douglas-county-nevada. 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), Douglas County, 1981 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/median-air-quality-index/douglas-county-nevada.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Douglas County, 1981 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/douglas-county-nevada (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Douglas County, 1981 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/median-air-quality-index/douglas-county-nevada. 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), Douglas County, 1981 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/median-air-quality-index/douglas-county-nevada
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/douglas-county-nevada.
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 Douglas County?

Median Air Quality Index (US EPA) in Douglas County was 22 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged from 2024. That is the 9th highest of 9 counties in 2025.

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 Douglas County?

47 in 1991, the highest value since 1981 in this series.

Related statistics for Douglas County

All statistics for Douglas County | Douglas County in figures