Data / Highest daily Air Quality Index (US EPA) / Yukon-Koyukuk Census Area

Highest daily Air Quality Index (US EPA) in Yukon-Koyukuk Census Area

Highest daily Air Quality Index (US EPA) in Yukon-Koyukuk Census Area was 96 in 2015, according to the U.S. Environmental Protection Agency. That is up 63 from 2014.

2015, index96
Change on 2014+63
Series high1772009
Series low182008

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Highest daily Air Quality Index (US EPA) in Yukon-Koyukuk Census Area, 2008 to 2015

05010015020020082010201220152008: 18 index2009: 177 index2010: 82 index2011: 63 index2012: 28 index2013: 99 index2014: 33 index2015: 96 index0501001502002008201120152008: 18 index2009: 177 index2010: 82 index2011: 63 index2012: 28 index2013: 99 index2014: 33 index2015: 96 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
201596
201433
201399
201228
201163
201082
2009177
200818

Yukon-Koyukuk Census Area compared with nearby places

Aleutians East Borough: 44 indexAnchorage Municipality: 79 indexDenali Borough: 90 indexFairbanks North Star Borough: 263 indexJuneau City and Borough: 92 indexKenai Peninsula Borough: 22 indexMatanuska-Susitna Borough: 155 indexYukon-Koyukuk Census Area: 96 index
  • Under 58
  • 58 to 88
  • 88 to 93
  • 93 to 130
  • 130 and over
  • No data
Highest daily Air Quality Index (US EPA), 2015, index. Yukon-Koyukuk Census Area 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), Yukon-Koyukuk Census Area, 2008 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: highest daily AQI, Highest daily Air Quality Index (US EPA), Yukon-Koyukuk Census Area, 2008 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/highest-daily-air-quality-index/yukon-koyukuk-census-area-alaska. 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), Yukon-Koyukuk Census Area, 2008 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/highest-daily-air-quality-index/yukon-koyukuk-census-area-alaska.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Yukon-Koyukuk Census Area, 2008 to 2015 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/highest-daily-air-quality-index/yukon-koyukuk-census-area-alaska (Accessed: 12 October 2026).

BibTeX
@misc{environmental_highest_daily_air_quality_2015,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Yukon-Koyukuk Census Area, 2008 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/highest-daily-air-quality-index/yukon-koyukuk-census-area-alaska. 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), Yukon-Koyukuk Census Area, 2008 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/highest-daily-air-quality-index/yukon-koyukuk-census-area-alaska
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/yukon-koyukuk-census-area-alaska.
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 Yukon-Koyukuk Census Area?

Highest daily Air Quality Index (US EPA) in Yukon-Koyukuk Census Area was 96 in 2015, according to the U.S. Environmental Protection Agency. That is up 63 from 2014.

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 Yukon-Koyukuk Census Area?

177 in 2009, the highest value since 2008 in this series.

Related statistics for Yukon-Koyukuk Census Area

All statistics for Yukon-Koyukuk Census Area | Yukon-Koyukuk Census Area in figures