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

Median Air Quality Index (US EPA) in Lyon County

Median Air Quality Index (US EPA) in Lyon County was 41 in 2025, according to the U.S. Environmental Protection Agency. That is down 1 from 2024. That is the 6th highest of 9 counties in 2025.

2025, index41
Change on 2024-1
Rank6th of 9Counties in Nevada ranked
Series high472012
Series low372010

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

Get an email when a new figure is out or this one is revised.
Keep it in a collection in your library.

Median Air Quality Index (US EPA) in Lyon County, 2007 to 2025

3638404244464820072010201320162019202220252007: 45 index2008: 44 index2009: 39 index2010: 37 index2011: 44 index2012: 47 index2013: 47 index2014: 47 index2015: 45 index2016: 41 index2017: 42 index2018: 40 index2019: 38 index2020: 38 index2021: 41 index2022: 39 index2023: 41 index2024: 42 index2025: 41 index3537.54042.54547.52007201420252007: 45 index2008: 44 index2009: 39 index2010: 37 index2011: 44 index2012: 47 index2013: 47 index2014: 47 index2015: 45 index2016: 41 index2017: 42 index2018: 40 index2019: 38 index2020: 38 index2021: 41 index2022: 39 index2023: 41 index2024: 42 index2025: 41 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 19 values
Periodindex
202541
202442
202341
202239
202141
202038
201938
201840
201742
201641
201545
201447
201347
201247
201144
201037
200939
200844
200745

Lyon 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. Lyon 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.

Report a problem with this figure

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), Lyon County, 2007 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), Lyon County, 2007 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/lyon-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), Lyon County, 2007 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/lyon-county-nevada.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Lyon County, 2007 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/lyon-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), Lyon County, 2007 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/lyon-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), Lyon County, 2007 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/lyon-county-nevada
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/lyon-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  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

What is the latest median Air Quality Index (US EPA) in Lyon County? Cite the source.
get_value {"indicator":"aqi_median","place":"us-county-32019"}
GET https://invokely.ai/api/v1/value?indicator=aqi_median&place=us-county-32019

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

What is the median Air Quality Index (US EPA) in Lyon County?

Median Air Quality Index (US EPA) in Lyon County was 41 in 2025, according to the U.S. Environmental Protection Agency. That is down 1 from 2024. That is the 6th 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 Lyon County?

47 in 2012, the highest value since 2007 in this series.

Related statistics for Lyon County

All statistics for Lyon County | Lyon County in figures