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

Median Air Quality Index (US EPA) in Berkeley County

Median Air Quality Index (US EPA) in Berkeley County was 39 in 2025, according to the U.S. Environmental Protection Agency. That is down 3 from 2024.

2025, index39
Change on 2024-3
Series high612000
Series low382020

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 Berkeley County, 1999 to 2025

3540455055606519992003200720112015201920251999: 60 index2000: 61 index2001: 57 index2002: 52 index2003: 50 index2004: 48 index2005: 54 index2006: 49 index2007: 52 index2008: 48 index2009: 45 index2010: 51 index2011: 46 index2012: 47 index2013: 43 index2014: 44 index2015: 47 index2016: 42 index2017: 40 index2018: 39 index2019: 40 index2020: 38 index2021: 40 index2022: 38 index2023: 44 index2024: 42 index2025: 39 index304050607019992008201720251999: 60 index2000: 61 index2001: 57 index2002: 52 index2003: 50 index2004: 48 index2005: 54 index2006: 49 index2007: 52 index2008: 48 index2009: 45 index2010: 51 index2011: 46 index2012: 47 index2013: 43 index2014: 44 index2015: 47 index2016: 42 index2017: 40 index2018: 39 index2019: 40 index2020: 38 index2021: 40 index2022: 38 index2023: 44 index2024: 42 index2025: 39 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 27 values
Periodindex
202539
202442
202344
202238
202140
202038
201940
201839
201740
201642
201547
201444
201343
201247
201146
201051
200945
200848
200752
200649
200554
200448
200350
200252
200157
200061
199960

Berkeley County compared with nearby places

Berkeley County: 39 indexBrooke County: 36 indexCabell County: 42 indexGreenbrier County: 37 indexHancock County: 42 indexHarrison County: 33 indexKanawha County: 39 indexMarion County: 37 indexMarshall County: 42 indexMonongalia County: 42 indexOhio County: 40 indexTucker County: 36 indexWood County: 39 index
  • Under 36
  • 36 to 39
  • 39 to 42
  • 42 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Berkeley 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), Berkeley County, 1999 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), Berkeley County, 1999 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/berkeley-county-west-virginia. 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), Berkeley County, 1999 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/berkeley-county-west-virginia.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Berkeley County, 1999 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/berkeley-county-west-virginia (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), Berkeley County, 1999 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/berkeley-county-west-virginia. 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), Berkeley County, 1999 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/berkeley-county-west-virginia
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/berkeley-county-west-virginia.
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 Berkeley County?

Median Air Quality Index (US EPA) in Berkeley County was 39 in 2025, according to the U.S. Environmental Protection Agency. That is down 3 from 2024.

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 Berkeley County?

61 in 2000, the highest value since 1999 in this series.

Related statistics for Berkeley County

All statistics for Berkeley County | Berkeley County in figures