Data / Median Air Quality Index (US EPA) / Montrose County

Median Air Quality Index (US EPA) in Montrose County

Median Air Quality Index (US EPA) in Montrose County was 42 in 2018, according to the U.S. Environmental Protection Agency. That is up 1 from 2017.

2018, index42
Change on 2017+1
Series high422018
Series low211996

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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Median Air Quality Index (US EPA) in Montrose County, 1995 to 2018

202530354045199519971999200120181995: 29 index1996: 21 index1997: 22 index1998: 31 index1999: 31 index2000: 25 index2001: 23 index2016: 40 index2017: 41 index2018: 42 index203040501995199920181995: 29 index1996: 21 index1997: 22 index1998: 31 index1999: 31 index2000: 25 index2001: 23 index2016: 40 index2017: 41 index2018: 42 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 10 values
Periodindex
201842
201741
201640
200123
200025
199931
199831
199722
199621
199529

Montrose County compared with nearby places

Adams County: 54 indexAlamosa County: 19 indexArapahoe County: 46 indexArchuleta County: 38 indexBoulder County: 49 indexChaffee County: 58 indexClear Creek County: 51 indexDelta County: 36 indexDenver County: 54 indexDouglas County: 49 indexEl Paso County: 47 indexFremont County: 15 indexGarfield County: 48 indexGrand County: 47 indexGunnison County: 47 indexJackson County: 9 indexJefferson County: 46 indexLa Plata County: 45 indexLarimer County: 53 indexMesa County: 49 indexMoffat County: 42 indexMontezuma County: 44 indexMontrose County: 42 indexPark County: 51 indexPitkin County: 15 indexProwers County: 16 indexPueblo County: 29 indexRio Blanco County: 47 indexRoutt County: 15 indexSan Juan County: 10 indexSan Miguel County: 46 indexTeller County: 58 indexWeld County: 54 index
  • Under 17
  • 17 to 42
  • 42 to 46
  • 46 to 48
  • 48 to 52
  • 52 and over
  • No data
Median Air Quality Index (US EPA), 2018, index. Montrose 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), Montrose County, 1995 to 2018) [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), Montrose County, 1995 to 2018. 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/montrose-county-colorado. 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), Montrose County, 1995 to 2018. 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/montrose-county-colorado.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Montrose County, 1995 to 2018 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/montrose-county-colorado (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2018,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Montrose County, 1995 to 2018}},
  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/montrose-county-colorado. 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), Montrose County, 1995 to 2018
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/montrose-county-colorado
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/montrose-county-colorado.
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 Montrose County?

Median Air Quality Index (US EPA) in Montrose County was 42 in 2018, according to the U.S. Environmental Protection Agency. That is up 1 from 2017.

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 Montrose County?

42 in 2018, the highest value since 1995 in this series.

Related statistics for Montrose County

All statistics for Montrose County | Montrose County in figures