Data / Highest daily Air Quality Index (US EPA) / Montgomery County

Highest daily Air Quality Index (US EPA) in Montgomery County

Highest daily Air Quality Index (US EPA) in Montgomery County was 55 in 2009, according to the U.S. Environmental Protection Agency. That is up 7 from 2008. That is the 14th highest of 15 counties in 2009.

2009, index55
Change on 2008+7
Rank14th of 15Counties in Kansas ranked
Series high1661991
Series low382004

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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Highest daily Air Quality Index (US EPA) in Montgomery County, 1990 to 2009

050100150200199019982001200420091990: 150 index1991: 166 index1992: 54 index1998: 69 index1999: 80 index2000: 63 index2001: 48 index2002: 51 index2003: 62 index2004: 38 index2005: 52 index2006: 52 index2007: 69 index2008: 48 index2009: 55 index05010015020019902000200520091990: 150 index1991: 166 index1992: 54 index1998: 69 index1999: 80 index2000: 63 index2001: 48 index2002: 51 index2003: 62 index2004: 38 index2005: 52 index2006: 52 index2007: 69 index2008: 48 index2009: 55 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 15 values
Periodindex
200955
200848
200769
200652
200552
200438
200362
200251
200148
200063
199980
199869
199254
1991166
1990150

Montgomery County compared with nearby places

Brown County: 107 indexChase County: 69 indexFord County: 66 indexJohnson County: 129 indexLeavenworth County: 90 indexLinn County: 101 indexMontgomery County: 55 indexNeosho County: 49 indexRiley County: 97 indexSedgwick County: 174 indexShawnee County: 101 indexSherman County: 61 indexSumner County: 136 indexTrego County: 112 indexWyandotte County: 108 index
  • Under 65
  • 65 to 94
  • 94 to 100
  • 100 to 120
  • 120 and over
  • No data
Highest daily 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

Highest daily Air Quality Index (AQI) value recorded in a US county during the year, from the EPA AirData annual summaries. Values above 500 are beyond the AQI scale and are published as EPA computes them.

A single day decides the value, so one wildfire or dust event can set it. Dust from the dry Owens Lake bed puts Inyo and Mono counties in California in the thousands. 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: highest 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: highest daily AQI (Highest daily 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: highest daily AQI, Highest daily 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/highest-daily-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: highest daily AQI. Highest daily 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/highest-daily-air-quality-index/montgomery-county-kansas.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily 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/highest-daily-air-quality-index/montgomery-county-kansas (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2009,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily 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/highest-daily-air-quality-index/montgomery-county-kansas. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest 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: highest daily AQI: Highest daily 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/highest-daily-air-quality-index/montgomery-county-kansas
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/montgomery-county-kansas.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: highest 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 highest daily Air Quality Index (US EPA) in Montgomery County?

Highest daily Air Quality Index (US EPA) in Montgomery County was 55 in 2009, according to the U.S. Environmental Protection Agency. That is up 7 from 2008. That is the 14th highest of 15 counties in 2009.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: highest daily AQI. Retrieved by Invokely on 2026-10-12.

What was the highest highest daily Air Quality Index (US EPA) in Montgomery County?

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

Related statistics for Montgomery County

All statistics for Montgomery County | Montgomery County in figures