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

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

Highest daily Air Quality Index (US EPA) in Franklin County was 82 in 2025, according to the U.S. Environmental Protection Agency. That is down 6 from 2024.

2025, index82
Change on 2024-6
Series high1842013
Series low562004

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 Franklin County, 2004 to 2025

501001502002004200820122016202020252004: 56 index2005: 171 index2006: 113 index2007: 117 index2008: 140 index2009: 134 index2010: 161 index2011: 172 index2012: 125 index2013: 184 index2014: 105 index2015: 170 index2016: 125 index2017: 172 index2018: 124 index2019: 112 index2020: 162 index2021: 119 index2022: 103 index2023: 155 index2024: 88 index2025: 82 index501001502002004201220252004: 56 index2005: 171 index2006: 113 index2007: 117 index2008: 140 index2009: 134 index2010: 161 index2011: 172 index2012: 125 index2013: 184 index2014: 105 index2015: 170 index2016: 125 index2017: 172 index2018: 124 index2019: 112 index2020: 162 index2021: 119 index2022: 103 index2023: 155 index2024: 88 index2025: 82 index
index. Source: EPA, EPA AirData annual AQI by county: highest daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 22 values
Periodindex
202582
202488
2023155
2022103
2021119
2020162
2019112
2018124
2017172
2016125
2015170
2014105
2013184
2012125
2011172
2010161
2009134
2008140
2007117
2006113
2005171
200456

Franklin County compared with nearby places

Ada County: 97 indexBannock County: 111 indexBenewah County: 92 indexBlaine County: 75 indexBoise County: 135 indexBonner County: 138 indexBonneville County: 95 indexButte County: 77 indexCanyon County: 91 indexCuster County: 56 indexFranklin County: 82 indexIdaho County: 215 indexKootenai County: 118 indexLatah County: 107 indexLemhi County: 163 indexNez Perce County: 161 indexShoshone County: 111 indexTwin Falls County: 105 indexValley County: 104 index
  • Under 87
  • 87 to 98
  • 98 to 110
  • 110 to 140
  • 140 and over
  • No data
Highest daily Air Quality Index (US EPA), 2025, index. Franklin 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), Franklin County, 2004 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), Franklin County, 2004 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/franklin-county-idaho. 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), Franklin County, 2004 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/franklin-county-idaho.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: highest daily AQI, Highest daily Air Quality Index (US EPA), Franklin County, 2004 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/franklin-county-idaho (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), Franklin County, 2004 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/franklin-county-idaho. 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), Franklin County, 2004 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/franklin-county-idaho
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/highest-daily-air-quality-index/franklin-county-idaho.
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 Franklin County?

Highest daily Air Quality Index (US EPA) in Franklin County was 82 in 2025, according to the U.S. Environmental Protection Agency. That is down 6 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 Franklin County?

184 in 2013, the highest value since 2004 in this series.

Related statistics for Franklin County

All statistics for Franklin County | Franklin County in figures