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

Median Air Quality Index (US EPA) in Clinton County

Median Air Quality Index (US EPA) in Clinton County was 45 in 2025, according to the U.S. Environmental Protection Agency. That is down 1 from 2024.

2025, index45
Change on 2024-1
Series high602011
Series low171985

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 Clinton County, 1985 to 2025

10203040506019851991199720032009201520251985: 17 index1986: 31 index1987: 29 index1988: 31 index1989: 26 index1990: 26 index1991: 26 index1992: 27 index1993: 24 index1994: 27 index1995: 30 index1996: 23 index1997: 26 index1998: 20 index1999: 41 index2000: 41 index2001: 39 index2002: 36 index2003: 40 index2004: 36 index2005: 43 index2006: 47 index2007: 55 index2008: 55 index2009: 56 index2010: 59 index2011: 60 index2012: 60 index2013: 58 index2014: 56 index2015: 56 index2016: 57 index2017: 58 index2018: 52 index2019: 49 index2020: 45 index2021: 55 index2022: 52 index2023: 54 index2024: 46 index2025: 45 index020406019851999201320251985: 17 index1986: 31 index1987: 29 index1988: 31 index1989: 26 index1990: 26 index1991: 26 index1992: 27 index1993: 24 index1994: 27 index1995: 30 index1996: 23 index1997: 26 index1998: 20 index1999: 41 index2000: 41 index2001: 39 index2002: 36 index2003: 40 index2004: 36 index2005: 43 index2006: 47 index2007: 55 index2008: 55 index2009: 56 index2010: 59 index2011: 60 index2012: 60 index2013: 58 index2014: 56 index2015: 56 index2016: 57 index2017: 58 index2018: 52 index2019: 49 index2020: 45 index2021: 55 index2022: 52 index2023: 54 index2024: 46 index2025: 45 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
202545
202446
202354
202252
202155
202045
201949
201852
201758
201657
201556
201456
201358
201260
201160
201059
200956
200855
200755
200647
200543
200436
200340
200236
200139
200041
199941
199820
199726
199623
199530
199427
199324
199227
199126
199026
198926
198831
198729
198631
198517

Clinton County compared with nearby places

Black Hawk County: 49 indexBremer County: 38 indexClinton County: 45 indexHarrison County: 39 indexJohnson County: 37 indexLinn County: 44 indexMontgomery County: 43 indexMuscatine County: 43 indexPalo Alto County: 40 indexPolk County: 44 indexPottawattamie County: 37 indexScott County: 46 indexVan Buren County: 44 indexWebster County: 45 indexWoodbury County: 39 index
  • Under 39
  • 39 to 42
  • 42 to 44
  • 44 to 45
  • 45 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Clinton 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), Clinton 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), Clinton 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/clinton-county-iowa. 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), Clinton 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/clinton-county-iowa.

Harvard

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

Median Air Quality Index (US EPA) in Clinton County was 45 in 2025, according to the U.S. Environmental Protection Agency. That is down 1 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 Clinton County?

60 in 2011, the highest value since 1985 in this series.

Related statistics for Clinton County

All statistics for Clinton County | Clinton County in figures