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

Median Air Quality Index (US EPA) in Prowers County

Median Air Quality Index (US EPA) in Prowers County was 27 in 2025, according to the U.S. Environmental Protection Agency. That is up 2 from 2024. That is the 24th highest of 30 counties in 2025.

2025, index27
Change on 2024+2
Rank24th of 30Counties in Colorado ranked
Series high291986
Series low142015

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 Prowers County, 1985 to 2025

101520253019851991199720032009201520251985: 28 index1986: 29 index1987: 23 index1988: 22 index1989: 21 index1990: 17 index1991: 21 index1992: 23 index1993: 20 index1994: 19 index1995: 20 index1996: 19 index1997: 18 index1998: 22 index1999: 24 index2000: 23 index2001: 23 index2002: 24 index2003: 24 index2004: 20 index2005: 19 index2006: 19 index2007: 22 index2008: 23 index2009: 22 index2010: 24 index2011: 21 index2012: 23 index2013: 18 index2014: 19 index2015: 14 index2016: 17 index2017: 17 index2018: 16 index2019: 14 index2020: 17 index2021: 19 index2022: 18 index2023: 19 index2024: 25 index2025: 27 index101520253019851999201320251985: 28 index1986: 29 index1987: 23 index1988: 22 index1989: 21 index1990: 17 index1991: 21 index1992: 23 index1993: 20 index1994: 19 index1995: 20 index1996: 19 index1997: 18 index1998: 22 index1999: 24 index2000: 23 index2001: 23 index2002: 24 index2003: 24 index2004: 20 index2005: 19 index2006: 19 index2007: 22 index2008: 23 index2009: 22 index2010: 24 index2011: 21 index2012: 23 index2013: 18 index2014: 19 index2015: 14 index2016: 17 index2017: 17 index2018: 16 index2019: 14 index2020: 17 index2021: 19 index2022: 18 index2023: 19 index2024: 25 index2025: 27 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 41 values
Periodindex
202527
202425
202319
202218
202119
202017
201914
201816
201717
201617
201514
201419
201318
201223
201121
201024
200922
200823
200722
200619
200519
200420
200324
200224
200123
200023
199924
199822
199718
199619
199520
199419
199320
199223
199121
199017
198921
198822
198723
198629
198528

Prowers County compared with nearby places

Adams County: 49 indexAlamosa County: 25 indexArapahoe County: 48 indexArchuleta County: 34 indexBoulder County: 48 indexChaffee County: 48 indexClear Creek County: 48 indexDelta County: 29 indexDenver County: 50 indexDouglas County: 46 indexEl Paso County: 46 indexFremont County: 23 indexGarfield County: 47 indexGilpin County: 46 indexGrand County: 44 indexGunnison County: 46 indexJackson County: 9 indexJefferson County: 48 indexLa Plata County: 48 indexLarimer County: 50 indexMesa County: 46 indexMontezuma County: 45 indexPark County: 48 indexPitkin County: 19 indexProwers County: 27 indexPueblo County: 45 indexRoutt County: 22 indexSan Juan County: 12 indexSan Miguel County: 36 indexWeld County: 52 index
  • Under 25
  • 25 to 41
  • 41 to 46
  • 46 to 48
  • 48 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Prowers 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), Prowers County, 1985 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), Prowers County, 1985 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/prowers-county-colorado. 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), Prowers County, 1985 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/prowers-county-colorado.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Prowers County, 1985 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/prowers-county-colorado (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), Prowers County, 1985 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/prowers-county-colorado. 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), Prowers County, 1985 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/prowers-county-colorado
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/prowers-county-colorado.
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 Prowers County?

Median Air Quality Index (US EPA) in Prowers County was 27 in 2025, according to the U.S. Environmental Protection Agency. That is up 2 from 2024. That is the 24th highest of 30 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 Prowers County?

29 in 1986, the highest value since 1985 in this series.

Related statistics for Prowers County

All statistics for Prowers County | Prowers County in figures