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

Median Air Quality Index (US EPA) in Washoe County

Median Air Quality Index (US EPA) in Washoe County was 50 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged from 2024. That is the 2nd highest of 9 counties in 2025.

2025, index50
Change on 20240
Rank2nd of 9Counties in Nevada ranked
Series high771981
Series low441983

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 Washoe County, 1980 to 2025

405060708019801987199420012008201520251980: 57 index1981: 77 index1982: 48 index1983: 44 index1984: 67 index1985: 57 index1986: 68 index1987: 47 index1988: 50 index1989: 48 index1990: 54 index1991: 51 index1992: 50 index1993: 47 index1994: 49 index1995: 47 index1996: 47 index1997: 44 index1998: 45 index1999: 49 index2000: 47 index2001: 48 index2002: 48 index2003: 46 index2004: 46 index2005: 53 index2006: 47 index2007: 48 index2008: 48 index2009: 47 index2010: 47 index2011: 49 index2012: 58 index2013: 57 index2014: 54 index2015: 52 index2016: 49 index2017: 52 index2018: 51 index2019: 48 index2020: 50 index2021: 51 index2022: 51 index2023: 50 index2024: 50 index2025: 50 index405060708019801996201220251980: 57 index1981: 77 index1982: 48 index1983: 44 index1984: 67 index1985: 57 index1986: 68 index1987: 47 index1988: 50 index1989: 48 index1990: 54 index1991: 51 index1992: 50 index1993: 47 index1994: 49 index1995: 47 index1996: 47 index1997: 44 index1998: 45 index1999: 49 index2000: 47 index2001: 48 index2002: 48 index2003: 46 index2004: 46 index2005: 53 index2006: 47 index2007: 48 index2008: 48 index2009: 47 index2010: 47 index2011: 49 index2012: 58 index2013: 57 index2014: 54 index2015: 52 index2016: 49 index2017: 52 index2018: 51 index2019: 48 index2020: 50 index2021: 51 index2022: 51 index2023: 50 index2024: 50 index2025: 50 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 46 values
Periodindex
202550
202450
202350
202251
202151
202050
201948
201851
201752
201649
201552
201454
201357
201258
201149
201047
200947
200848
200748
200647
200553
200446
200346
200248
200148
200047
199949
199845
199744
199647
199547
199449
199347
199250
199151
199054
198948
198850
198747
198668
198557
198467
198344
198248
198177
198057

Washoe 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. Washoe 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), Washoe 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: median daily AQI, Median Air Quality Index (US EPA), Washoe 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/median-air-quality-index/washoe-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), Washoe 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/median-air-quality-index/washoe-county-nevada.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Washoe County, 1980 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/washoe-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), Washoe 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/median-air-quality-index/washoe-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), Washoe 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/median-air-quality-index/washoe-county-nevada
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/washoe-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 Washoe County?

Median Air Quality Index (US EPA) in Washoe County was 50 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged from 2024. That is the 2nd 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 Washoe County?

77 in 1981, the highest value since 1980 in this series.

Related statistics for Washoe County

All statistics for Washoe County | Washoe County in figures