Data / Highest daily Air Quality Index (US EPA) / Moffat County

Highest daily Air Quality Index (US EPA) in Moffat County

Highest daily Air Quality Index (US EPA) in Moffat County was 108 in 2018, according to the U.S. Environmental Protection Agency. That is up 24 from 2017.

2018, index108
Change on 2017+24
Series high1082018
Series low672016

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 Moffat County, 2011 to 2018

6070809010011020112013201520182011: 84 index2012: 105 index2013: 90 index2014: 90 index2015: 77 index2016: 67 index2017: 84 index2018: 108 index60801001202011201420182011: 84 index2012: 105 index2013: 90 index2014: 90 index2015: 77 index2016: 67 index2017: 84 index2018: 108 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 8 values
Periodindex
2018108
201784
201667
201577
201490
201390
2012105
201184

Moffat County compared with nearby places

Adams County: 130 indexAlamosa County: 235 indexArapahoe County: 156 indexArchuleta County: 97 indexBoulder County: 159 indexChaffee County: 161 indexClear Creek County: 164 indexDelta County: 85 indexDenver County: 150 indexDouglas County: 156 indexEl Paso County: 119 indexFremont County: 36 indexGarfield County: 151 indexGrand County: 151 indexGunnison County: 156 indexJackson County: 64 indexJefferson County: 151 indexLa Plata County: 243 indexLarimer County: 169 indexMesa County: 150 indexMoffat County: 108 indexMontezuma County: 115 indexMontrose County: 122 indexPark County: 174 indexPitkin County: 53 indexProwers County: 103 indexPueblo County: 101 indexRio Blanco County: 108 indexRoutt County: 51 indexSan Juan County: 100 indexSan Miguel County: 101 indexTeller County: 133 indexWeld County: 133 index
  • Under 98
  • 98 to 110
  • 110 to 130
  • 130 to 150
  • 150 to 160
  • 160 and over
  • No data
Highest daily Air Quality Index (US EPA), 2018, index. Moffat 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), Moffat County, 2011 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: highest daily AQI, Highest daily Air Quality Index (US EPA), Moffat County, 2011 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/highest-daily-air-quality-index/moffat-county-colorado. 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), Moffat County, 2011 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/highest-daily-air-quality-index/moffat-county-colorado.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Moffat County, 2011 to 2018 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/moffat-county-colorado (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2018,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Moffat County, 2011 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/highest-daily-air-quality-index/moffat-county-colorado. 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), Moffat County, 2011 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/highest-daily-air-quality-index/moffat-county-colorado
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/moffat-county-colorado.
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 Moffat County?

Highest daily Air Quality Index (US EPA) in Moffat County was 108 in 2018, according to the U.S. Environmental Protection Agency. That is up 24 from 2017.

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 Moffat County?

108 in 2018, the highest value since 2011 in this series.

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All statistics for Moffat County | Moffat County in figures