Data / Share of days with good air quality (US EPA AQI) / Montgomery County

Share of days with good air quality (US EPA AQI) in Montgomery County

Share of days with good air quality (US EPA AQI) in Montgomery County was 27.1% in 2015, according to EPA. That is down 8.5 pts from 2014. That is the 39th highest of 39 counties in 2015.

201527.1%
Change on 2014-8.5 pts
Rank39th of 39Counties in Indiana ranked
Series high1001988
Series low27.12015

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Share of days with good air quality (US EPA AQI) in Montgomery County, 1988 to 2015

20406080100198819901992199420151988: 100 %1989: 89.8 %1990: 88.2 %1991: 93.3 %1992: 100 %1993: 100 %1994: 100 %2014: 35.6 %2015: 27.1 %204060801001988199120151988: 100 %1989: 89.8 %1990: 88.2 %1991: 93.3 %1992: 100 %1993: 100 %1994: 100 %2014: 35.6 %2015: 27.1 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 9 values
Period%
201527.1
201435.6
1994100
1993100
1992100
199193.3
199088.2
198989.8
1988100

Montgomery County compared with nearby places

Allen County: 49.6 %Bartholomew County: 48.8 %Boone County: 81.8 %Brown County: 91.7 %Carroll County: 84.7 %Clark County: 44 %Delaware County: 78.4 %Dubois County: 53.3 %Elkhart County: 49 %Floyd County: 41.3 %Greene County: 69.1 %Hamilton County: 59.2 %Hancock County: 90.2 %Hendricks County: 97.8 %Henry County: 63.6 %Howard County: 29.2 %Huntington County: 98.3 %Jackson County: 84.4 %Johnson County: 88.3 %Knox County: 90 %Lake County: 38.6 %LaPorte County: 72.8 %Madison County: 55.6 %Marion County: 35.3 %Monroe County: 67.5 %Montgomery County: 27.1 %Morgan County: 89 %Perry County: 80.3 %Porter County: 56.4 %Posey County: 85.2 %St. Joseph County: 42 %Shelby County: 90.7 %Spencer County: 54.8 %Tippecanoe County: 49.1 %Vanderburgh County: 38.9 %Vigo County: 45.6 %Wabash County: 92.2 %Warrick County: 78.1 %Whitley County: 47.4 %
  • Under 43
  • 43 to 49
  • 49 to 64
  • 64 to 81
  • 81 to 90
  • 90 and over
  • No data
Share of days with good air quality (US EPA AQI), 2015, %. 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

Days with a daily Air Quality Index of 0 to 50 (good) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; both counts are stored with each value.

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: good days as a share of days with an AQI, calculated with stored counts. 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: good days as a share of days with an AQI, calculated with stored counts (Share of days with good air quality (US EPA AQI), 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: good days as a share of days with an AQI, calculated with stored counts, Share of days with good air quality (US EPA AQI), 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/good-air-quality-days-share/montgomery-county-indiana. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Share of days with good air quality (US EPA AQI), 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/good-air-quality-days-share/montgomery-county-indiana.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Share of days with good air quality (US EPA AQI), Montgomery County, 1988 to 2015 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/montgomery-county-indiana (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2015,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Share of days with good air quality (US EPA AQI), 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/good-air-quality-days-share/montgomery-county-indiana. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. 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: good days as a share of days with an AQI, calculated with stored counts: Share of days with good air quality (US EPA AQI), 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/good-air-quality-days-share/montgomery-county-indiana
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/montgomery-county-indiana.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
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Questions

What is the share of days with good air quality (US EPA AQI) in Montgomery County?

Share of days with good air quality (US EPA AQI) in Montgomery County was 27.1% in 2015, according to EPA. That is down 8.5 pts from 2014. That is the 39th highest of 39 counties in 2015.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Retrieved by Invokely on 2026-10-12.

What was the highest share of days with good air quality (US EPA AQI) in Montgomery County?

100% in 1988, the highest value since 1988 in this series.

Related statistics for Montgomery County

All statistics for Montgomery County | Montgomery County in figures