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 83 in 2015, according to the U.S. Environmental Protection Agency. That is up 3 from 2014. That is the 31st highest of 39 counties in 2015.

2015, index83
Change on 2014+3
Rank31st of 39Counties in Indiana ranked
Series high832015
Series low111993

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, 1988 to 2015

020406080100198819901992199420151988: 20 index1989: 62 index1990: 67 index1991: 62 index1992: 37 index1993: 11 index1994: 16 index2014: 80 index2015: 83 index0204060801001988199120151988: 20 index1989: 62 index1990: 67 index1991: 62 index1992: 37 index1993: 11 index1994: 16 index2014: 80 index2015: 83 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 9 values
Periodindex
201583
201480
199416
199311
199237
199162
199067
198962
198820

Montgomery County compared with nearby places

Allen County: 176 indexBartholomew County: 115 indexBoone County: 97 indexBrown County: 101 indexCarroll County: 87 indexClark County: 164 indexDelaware County: 105 indexDubois County: 79 indexElkhart County: 124 indexFloyd County: 108 indexGreene County: 115 indexHamilton County: 93 indexHancock County: 97 indexHendricks County: 61 indexHenry County: 75 indexHoward County: 101 indexHuntington County: 71 indexJackson County: 101 indexJohnson County: 90 indexKnox County: 93 indexLake County: 151 indexLaPorte County: 126 indexMadison County: 89 indexMarion County: 159 indexMonroe County: 82 indexMontgomery County: 83 indexMorgan County: 80 indexPerry County: 112 indexPorter County: 168 indexPosey County: 115 indexSt. Joseph County: 134 indexShelby County: 77 indexSpencer County: 78 indexTippecanoe County: 99 indexVanderburgh County: 133 indexVigo County: 151 indexWabash County: 126 indexWarrick County: 115 indexWhitley County: 89 index
  • Under 81
  • 81 to 92
  • 92 to 100
  • 100 to 120
  • 120 to 130
  • 130 and over
  • No data
Highest daily Air Quality Index (US EPA), 2015, 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, 1988 to 2015) [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, 1988 to 2015. 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-indiana. 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, 1988 to 2015. 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-indiana.

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, 1988 to 2015 [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-indiana (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2015,
  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, 1988 to 2015}},
  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-indiana. 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, 1988 to 2015
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-indiana
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/montgomery-county-indiana.
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 83 in 2015, according to the U.S. Environmental Protection Agency. That is up 3 from 2014. That is the 31st highest of 39 counties in 2015.

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?

83 in 2015, the highest value since 1988 in this series.

Related statistics for Montgomery County

All statistics for Montgomery County | Montgomery County in figures