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

Median Air Quality Index (US EPA) in Clark County

Median Air Quality Index (US EPA) in Clark County was 61 in 2025, according to the U.S. Environmental Protection Agency. That is down 3 from 2024. That is the 1st highest of 9 counties in 2025.

2025, index61
Change on 2024-3
Rank1st of 9Counties in Nevada ranked
Series high911981
Series low582009

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 Clark County, 1980 to 2025

506070809010019801987199420012008201520251980: 85 index1981: 91 index1982: 75 index1983: 64 index1984: 74 index1985: 77 index1986: 71 index1987: 61 index1988: 74 index1989: 74 index1990: 72 index1991: 69 index1992: 61 index1993: 61 index1994: 73 index1995: 65 index1996: 69 index1997: 61 index1998: 68 index1999: 76 index2000: 70 index2001: 71 index2002: 72 index2003: 71 index2004: 66 index2005: 65 index2006: 67 index2007: 65 index2008: 61 index2009: 58 index2010: 58 index2011: 58 index2012: 66 index2013: 63 index2014: 61 index2015: 61 index2016: 61 index2017: 61 index2018: 63 index2019: 58 index2020: 65 index2021: 62 index2022: 64 index2023: 61 index2024: 64 index2025: 61 index506070809010019801996201220251980: 85 index1981: 91 index1982: 75 index1983: 64 index1984: 74 index1985: 77 index1986: 71 index1987: 61 index1988: 74 index1989: 74 index1990: 72 index1991: 69 index1992: 61 index1993: 61 index1994: 73 index1995: 65 index1996: 69 index1997: 61 index1998: 68 index1999: 76 index2000: 70 index2001: 71 index2002: 72 index2003: 71 index2004: 66 index2005: 65 index2006: 67 index2007: 65 index2008: 61 index2009: 58 index2010: 58 index2011: 58 index2012: 66 index2013: 63 index2014: 61 index2015: 61 index2016: 61 index2017: 61 index2018: 63 index2019: 58 index2020: 65 index2021: 62 index2022: 64 index2023: 61 index2024: 64 index2025: 61 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
202561
202464
202361
202264
202162
202065
201958
201863
201761
201661
201561
201461
201363
201266
201158
201058
200958
200861
200765
200667
200565
200466
200371
200272
200171
200070
199976
199868
199761
199669
199565
199473
199361
199261
199169
199072
198974
198874
198761
198671
198577
198474
198364
198275
198191
198085

Clark 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. Clark 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), Clark 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), Clark 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/clark-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), Clark 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/clark-county-nevada.

Harvard

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

Median Air Quality Index (US EPA) in Clark County was 61 in 2025, according to the U.S. Environmental Protection Agency. That is down 3 from 2024. That is the 1st 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 Clark County?

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

Related statistics for Clark County

All statistics for Clark County | Clark County in figures