Data / Median Air Quality Index (US EPA) / Deer Lodge County

Median Air Quality Index (US EPA) in Deer Lodge County

Median Air Quality Index (US EPA) in Deer Lodge County was 11 in 1992, according to the U.S. Environmental Protection Agency. That is up 1 from 1991.

1992, index11
Change on 1991+1
Series high281980
Series low101990

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Median Air Quality Index (US EPA) in Deer Lodge County, 1980 to 1992

101520253019801984198519891990199119921980: 28 index1984: 22 index1985: 25 index1989: 12 index1990: 10 index1991: 10 index1992: 11 index10152025301980198919921980: 28 index1984: 22 index1985: 25 index1989: 12 index1990: 10 index1991: 10 index1992: 11 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 7 values
Periodindex
199211
199110
199010
198912
198525
198422
198028

Deer Lodge County compared with nearby places

Big Horn County: 16 indexBlaine County: 17 indexBroadwater County: 18 indexCascade County: 23 indexDeer Lodge County: 11 indexFergus County: 13 indexFlathead County: 38 indexGallatin County: 32 indexJefferson County: 16 indexLake County: 28 indexLewis and Clark County: 30 indexLincoln County: 42 indexMadison County: 11 indexMissoula County: 41 indexPark County: 10 indexPhillips County: 11 indexRoosevelt County: 12 indexRosebud County: 21 indexSanders County: 26 indexSilver Bow County: 22 indexStillwater County: 8 indexYellowstone County: 23 index
  • Under 11
  • 11 to 16
  • 16 to 23
  • 23 to 30
  • 30 and over
  • No data
Median Air Quality Index (US EPA), 1992, index. Deer Lodge 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), Deer Lodge County, 1980 to 1992) [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), Deer Lodge County, 1980 to 1992. 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/deer-lodge-county-montana. 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), Deer Lodge County, 1980 to 1992. 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/deer-lodge-county-montana.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Deer Lodge County, 1980 to 1992 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/deer-lodge-county-montana (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_1992,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Deer Lodge County, 1980 to 1992}},
  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/deer-lodge-county-montana. 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), Deer Lodge County, 1980 to 1992
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/deer-lodge-county-montana
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/deer-lodge-county-montana.
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 Deer Lodge County?

Median Air Quality Index (US EPA) in Deer Lodge County was 11 in 1992, according to the U.S. Environmental Protection Agency. That is up 1 from 1991.

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 Deer Lodge County?

28 in 1980, the highest value since 1980 in this series.

Related statistics for Deer Lodge County

All statistics for Deer Lodge County | Deer Lodge County in figures