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 93 in 2004, according to the U.S. Environmental Protection Agency. That is down 15 from 2003.

2004, index93
Change on 2003-15
Series high1611998
Series low501991

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, 1991 to 2004

507510012515017519911993199519971999200120041991: 50 index1992: 80 index1993: 77 index1994: 90 index1995: 122 index1996: 93 index1997: 101 index1998: 161 index1999: 147 index2000: 119 index2001: 80 index2002: 126 index2003: 108 index2004: 93 index501001502001991199620041991: 50 index1992: 80 index1993: 77 index1994: 90 index1995: 122 index1996: 93 index1997: 101 index1998: 161 index1999: 147 index2000: 119 index2001: 80 index2002: 126 index2003: 108 index2004: 93 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 14 values
Periodindex
200493
2003108
2002126
200180
2000119
1999147
1998161
1997101
199693
1995122
199490
199377
199280
199150

Montgomery County compared with nearby places

Arkansas County: 97 indexAshley County: 85 indexClark County: 154 indexCrittenden County: 140 indexFaulkner County: 86 indexGarland County: 89 indexMississippi County: 86 indexMontgomery County: 93 indexNewton County: 133 indexPhillips County: 89 indexPolk County: 80 indexPope County: 99 indexPulaski County: 151 indexSebastian County: 92 indexUnion County: 87 indexWashington County: 77 indexWhite County: 96 index
  • Under 86
  • 86 to 89
  • 89 to 95
  • 95 to 130
  • 130 and over
  • No data
Highest daily Air Quality Index (US EPA), 2004, 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, 1991 to 2004) [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, 1991 to 2004. 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-arkansas. 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, 1991 to 2004. 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-arkansas.

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, 1991 to 2004 [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-arkansas (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2004,
  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, 1991 to 2004}},
  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-arkansas. 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, 1991 to 2004
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-arkansas
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/montgomery-county-arkansas.
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 93 in 2004, according to the U.S. Environmental Protection Agency. That is down 15 from 2003.

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?

161 in 1998, the highest value since 1991 in this series.

Related statistics for Montgomery County

All statistics for Montgomery County | Montgomery County in figures