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

Median Air Quality Index (US EPA) in Coconino County

Median Air Quality Index (US EPA) in Coconino County was 46 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged from 2024. That is the 8th highest of 13 counties in 2025.

2025, index46
Change on 20240
Rank8th of 13Counties in Arizona ranked
Series high491999
Series low61984

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 Coconino County, 1980 to 2025

0102030405019801987199420012008201520251980: 40 index1981: 37 index1982: 41 index1983: 37 index1984: 6 index1985: 40 index1986: 22 index1987: 18 index1988: 17 index1989: 42 index1990: 46 index1991: 45 index1992: 44 index1993: 44 index1994: 48 index1995: 48 index1996: 47 index1997: 46 index1998: 48 index1999: 49 index2000: 47 index2001: 47 index2002: 49 index2003: 49 index2004: 47 index2005: 47 index2006: 48 index2007: 49 index2008: 48 index2009: 46 index2010: 47 index2011: 47 index2012: 47 index2013: 46 index2014: 44 index2015: 44 index2016: 44 index2017: 46 index2018: 45 index2019: 45 index2020: 44 index2021: 46 index2022: 44 index2023: 46 index2024: 46 index2025: 46 index020406019801996201220251980: 40 index1981: 37 index1982: 41 index1983: 37 index1984: 6 index1985: 40 index1986: 22 index1987: 18 index1988: 17 index1989: 42 index1990: 46 index1991: 45 index1992: 44 index1993: 44 index1994: 48 index1995: 48 index1996: 47 index1997: 46 index1998: 48 index1999: 49 index2000: 47 index2001: 47 index2002: 49 index2003: 49 index2004: 47 index2005: 47 index2006: 48 index2007: 49 index2008: 48 index2009: 46 index2010: 47 index2011: 47 index2012: 47 index2013: 46 index2014: 44 index2015: 44 index2016: 44 index2017: 46 index2018: 45 index2019: 45 index2020: 44 index2021: 46 index2022: 44 index2023: 46 index2024: 46 index2025: 46 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 46 values
Periodindex
202546
202446
202346
202244
202146
202044
201945
201845
201746
201644
201544
201444
201346
201247
201147
201047
200946
200848
200749
200648
200547
200447
200349
200249
200147
200047
199949
199848
199746
199647
199548
199448
199344
199244
199145
199046
198942
198817
198718
198622
198540
19846
198337
198241
198137
198040

Coconino County compared with nearby places

Apache County: 33 indexCochise County: 45 indexCoconino County: 46 indexGila County: 47 indexLa Paz County: 44 indexMaricopa County: 73 indexMohave County: 17 indexNavajo County: 13 indexPima County: 54 indexPinal County: 67 indexSanta Cruz County: 49 indexYavapai County: 47 indexYuma County: 48 index
  • Under 37
  • 37 to 46
  • 46 to 47
  • 47 to 52
  • 52 and over
  • No data
Median Air Quality Index (US EPA), 2025, index. Coconino 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), Coconino County, 1980 to 2025) [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), Coconino County, 1980 to 2025. 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/coconino-county-arizona. 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), Coconino County, 1980 to 2025. 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/coconino-county-arizona.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Coconino County, 1980 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/coconino-county-arizona (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Coconino County, 1980 to 2025}},
  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/coconino-county-arizona. 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), Coconino County, 1980 to 2025
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/coconino-county-arizona
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/coconino-county-arizona.
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 Coconino County?

Median Air Quality Index (US EPA) in Coconino County was 46 in 2025, according to the U.S. Environmental Protection Agency. That is unchanged from 2024. That is the 8th highest of 13 counties in 2025.

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 Coconino County?

49 in 1999, the highest value since 1980 in this series.

Related statistics for Coconino County

All statistics for Coconino County | Coconino County in figures