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

Median Air Quality Index (US EPA) in Montgomery County

Median Air Quality Index (US EPA) in Montgomery County was 16 in 2009, according to the U.S. Environmental Protection Agency. That is down 1 from 2008. That is the 13th highest of 15 counties in 2009.

2009, index16
Change on 2008-1
Rank13th of 15Counties in Kansas ranked
Series high371991
Series low91990

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 Montgomery County, 1990 to 2009

010203040199019982001200420091990: 9 index1991: 37 index1992: 28 index1998: 21 index1999: 20 index2000: 19 index2001: 15 index2002: 18 index2003: 19 index2004: 11 index2005: 13 index2006: 21 index2007: 19 index2008: 17 index2009: 16 index01020304019902000200520091990: 9 index1991: 37 index1992: 28 index1998: 21 index1999: 20 index2000: 19 index2001: 15 index2002: 18 index2003: 19 index2004: 11 index2005: 13 index2006: 21 index2007: 19 index2008: 17 index2009: 16 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 15 values
Periodindex
200916
200817
200719
200621
200513
200411
200319
200218
200115
200019
199920
199821
199228
199137
19909

Montgomery County compared with nearby places

Brown County: 35 indexChase County: 34 indexFord County: 15 indexJohnson County: 38 indexLeavenworth County: 33 indexLinn County: 38 indexMontgomery County: 16 indexNeosho County: 16 indexRiley County: 37 indexSedgwick County: 41 indexShawnee County: 37 indexSherman County: 19 indexSumner County: 39 indexTrego County: 39 indexWyandotte County: 49 index
  • Under 18
  • 18 to 35
  • 35 to 37
  • 37 to 39
  • 39 and over
  • No data
Median Air Quality Index (US EPA), 2009, index. Montgomery 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), Montgomery County, 1990 to 2009) [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), Montgomery County, 1990 to 2009. 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/montgomery-county-kansas. 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), Montgomery County, 1990 to 2009. 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/montgomery-county-kansas.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Montgomery County, 1990 to 2009 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/montgomery-county-kansas (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2009,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Montgomery County, 1990 to 2009}},
  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/montgomery-county-kansas. 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), Montgomery County, 1990 to 2009
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/montgomery-county-kansas
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/montgomery-county-kansas.
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 Montgomery County?

Median Air Quality Index (US EPA) in Montgomery County was 16 in 2009, according to the U.S. Environmental Protection Agency. That is down 1 from 2008. That is the 13th highest of 15 counties in 2009.

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 Montgomery County?

37 in 1991, the highest value since 1990 in this series.

Related statistics for Montgomery County

All statistics for Montgomery County | Montgomery County in figures