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

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

Highest daily Air Quality Index (US EPA) in Mono County was 704 in 2025, according to the U.S. Environmental Protection Agency. That is up 635 from 2024.

2025, index704
Change on 2024+635
Series high15,5562009
Series low692024

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 Mono County, 1980 to 2025

05,00010K15K20K19801987199420012008201520251980: 91 index1981: 70 index1982: 140 index1983: 154 index1984: 154 index1985: 161 index1986: 169 index1987: 164 index1988: 182 index1989: 122 index1990: 164 index1991: 108 index1992: 377 index1993: 919 index1994: 166 index1995: 190 index1996: 161 index1997: 126 index1998: 108 index1999: 90 index2000: 11,464 index2001: 4,811 index2002: 7,060 index2003: 6,215 index2004: 926 index2005: 2,172 index2006: 4,609 index2007: 10,968 index2008: 2,907 index2009: 15,556 index2010: 4,658 index2011: 5,260 index2012: 4,244 index2013: 3,479 index2014: 2,739 index2015: 4,384 index2016: 7,063 index2017: 3,767 index2018: 1,049 index2019: 4,227 index2020: 2,088 index2021: 2,971 index2022: 8,368 index2023: 1,829 index2024: 69 index2025: 704 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 46 values
Periodindex
2025704
202469
20231,829
20228,368
20212,971
20202,088
20194,227
20181,049
20173,767
20167,063
20154,384
20142,739
20133,479
20124,244
20115,260
20104,658
200915,556
20082,907
200710,968
20064,609
20052,172
2004926
20036,215
20027,060
20014,811
200011,464
199990
1998108
1997126
1996161
1995190
1994166
1993919
1992377
1991108
1990164
1989122
1988182
1987164
1986169
1985161
1984154
1983154
1982140
198170
198091

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.

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), Mono 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: highest daily AQI, Highest daily Air Quality Index (US EPA), Mono 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/highest-daily-air-quality-index/mono-county-california. 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), Mono 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/highest-daily-air-quality-index/mono-county-california.

Harvard

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

BibTeX
@misc{environmental_highest_daily_air_quality_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: highest daily AQI: Highest daily Air Quality Index (US EPA), Mono 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/highest-daily-air-quality-index/mono-county-california. 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), Mono 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/highest-daily-air-quality-index/mono-county-california
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/mono-county-california.
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 Mono County?

Highest daily Air Quality Index (US EPA) in Mono County was 704 in 2025, according to the U.S. Environmental Protection Agency. That is up 635 from 2024.

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 Mono County?

15,556 in 2009, the highest value since 1980 in this series.

Related statistics for Mono County

All statistics for Mono County | Mono County in figures