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

Median Air Quality Index (US EPA) in Monroe County

Median Air Quality Index (US EPA) in Monroe County was 29 in 1990, according to the U.S. Environmental Protection Agency. That is down 7 from 1989.

1990, index29
Change on 1989-7
Series high391985
Series low291990

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Median Air Quality Index (US EPA) in Monroe County, 1980 to 1990

283032343638401980198219841986198819901980: 38 index1981: 38 index1982: 30 index1983: 35 index1984: 34 index1985: 39 index1986: 33 index1987: 38 index1988: 36 index1989: 36 index1990: 29 index27.53032.53537.5401980198419901980: 38 index1981: 38 index1982: 30 index1983: 35 index1984: 34 index1985: 39 index1986: 33 index1987: 38 index1988: 36 index1989: 36 index1990: 29 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 11 values
Periodindex
199029
198936
198836
198738
198633
198539
198434
198335
198230
198138
198038

Monroe County compared with nearby places

Adams County: 33 indexChampaign County: 31 indexColes County: 18 indexCook County: 53 indexDuPage County: 31 indexEffingham County: 44 indexJackson County: 22 indexJersey County: 43 indexKane County: 29 indexLake County: 29 indexLaSalle County: 36 indexLivingston County: 37 indexLogan County: 41 indexMcHenry County: 30 indexMacon County: 36 indexMacoupin County: 34 indexMadison County: 43 indexMonroe County: 29 indexPeoria County: 38 indexRandolph County: 35 indexRock Island County: 32 indexSt. Clair County: 38 indexSangamon County: 32 indexWill County: 31 indexWinnebago County: 35 index
  • Under 30
  • 30 to 32
  • 32 to 35
  • 35 to 39
  • 39 and over
  • No data
Median Air Quality Index (US EPA), 1990, index. Monroe 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), Monroe County, 1980 to 1990) [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), Monroe County, 1980 to 1990. 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/monroe-county-illinois. 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), Monroe County, 1980 to 1990. 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/monroe-county-illinois.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Monroe County, 1980 to 1990 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/monroe-county-illinois (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_1990,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Monroe County, 1980 to 1990}},
  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/monroe-county-illinois. 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), Monroe County, 1980 to 1990
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/monroe-county-illinois
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/monroe-county-illinois.
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 Monroe County?

Median Air Quality Index (US EPA) in Monroe County was 29 in 1990, according to the U.S. Environmental Protection Agency. That is down 7 from 1989.

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 Monroe County?

39 in 1985, the highest value since 1980 in this series.

Related statistics for Monroe County

All statistics for Monroe County | Monroe County in figures