Data / Share of days with good air quality (US EPA AQI) / Warren County

Share of days with good air quality (US EPA AQI) in Warren County

Share of days with good air quality (US EPA AQI) in Warren County was 78.7% in 2025, according to EPA. That is the 11th highest of 38 counties in 2025.

202578.7%
Rank11th of 38Counties in Pennsylvania ranked

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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Source: Invokely calculation with data from EPA. Retrieved 2026-10-12.

All 1 values
Period%
202578.7

Warren County compared with nearby places

Adams County: 74.4 %Allegheny County: 46 %Armstrong County: 70.5 %Beaver County: 55.6 %Berks County: 68.2 %Blair County: 76.9 %Bradford County: 81.6 %Bucks County: 86.2 %Cambria County: 74.5 %Centre County: 74.2 %Chester County: 71.3 %Cumberland County: 71.5 %Dauphin County: 62.5 %Delaware County: 65.2 %Elk County: 95.3 %Erie County: 76.7 %Fayette County: 78.9 %Franklin County: 91.5 %Greene County: 77.8 %Indiana County: 74.8 %Lackawanna County: 74 %Lancaster County: 60.5 %Lebanon County: 64.4 %Lehigh County: 72 %Lycoming County: 77.5 %Mercer County: 72.6 %Monroe County: 88.3 %Montgomery County: 73.4 %Northampton County: 72.1 %Philadelphia County: 50.4 %Somerset County: 94.5 %Susquehanna County: 88.4 %Tioga County: 82.1 %Warren County: 78.7 %Washington County: 67.7 %Westmoreland County: 78.2 %Wyoming County: 86.5 %York County: 59.5 %
  • Under 65
  • 65 to 72
  • 72 to 74
  • 74 to 78
  • 78 to 86
  • 86 and over
  • No data
Share of days with good air quality (US EPA AQI), 2025, %. Warren 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

Days with a daily Air Quality Index of 0 to 50 (good) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; both counts are stored with each value.

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: good days as a share of days with an AQI, calculated with stored counts. 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: good days as a share of days with an AQI, calculated with stored counts (Share of days with good air quality (US EPA AQI), Warren County, 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: good days as a share of days with an AQI, calculated with stored counts, Share of days with good air quality (US EPA AQI), Warren County, 2025. U.S. Environmental Protection Agency, 13 July 2026, https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Invokely, https://invokely.ai/en/good-air-quality-days-share/warren-county-pennsylvania. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Share of days with good air quality (US EPA AQI), Warren County, 2025. Dataset. Accessed October 12, 2026. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Also distributed by Invokely, https://invokely.ai/en/good-air-quality-days-share/warren-county-pennsylvania.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Share of days with good air quality (US EPA AQI), Warren County, 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/warren-county-pennsylvania (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Share of days with good air quality (US EPA AQI), Warren County, 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/good-air-quality-days-share/warren-county-pennsylvania. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. 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: good days as a share of days with an AQI, calculated with stored counts: Share of days with good air quality (US EPA AQI), Warren County, 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/good-air-quality-days-share/warren-county-pennsylvania
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/warren-county-pennsylvania.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -

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Questions

What is the share of days with good air quality (US EPA AQI) in Warren County?

Share of days with good air quality (US EPA AQI) in Warren County was 78.7% in 2025, according to EPA. That is the 11th highest of 38 counties in 2025.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Retrieved by Invokely on 2026-10-12.

Related statistics for Warren County

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