Data / Share of days with good air quality (US EPA AQI) / Franklin County

Share of days with good air quality (US EPA AQI) in Franklin County

Share of days with good air quality (US EPA AQI) in Franklin County was 96.3% in 2025, according to EPA. That is up 11.4 pts from 2024.

202596.3%
Change on 2024+11.4 pts
Series high96.32025
Series low27.32010

Next release: Tuesday, 13 July 2027, estimated by Invokely from past publication dates (low confidence), not announced by the publisher. Release calendar

Get an email when a new figure is out or this one is revised.
Keep it in a collection in your library.

Share of days with good air quality (US EPA AQI) in Franklin County, 2004 to 2025

204060801002004200820122016202020252004: 50 %2005: 74.8 %2006: 84.5 %2007: 81.5 %2008: 87.8 %2009: 76.2 %2010: 27.3 %2011: 72.8 %2012: 66.7 %2013: 72.5 %2014: 88.6 %2015: 85.1 %2016: 75.9 %2017: 65.5 %2018: 78.1 %2019: 86.5 %2020: 81.4 %2021: 78.1 %2022: 84.9 %2023: 85.9 %2024: 84.9 %2025: 96.3 %204060801002004201220252004: 50 %2005: 74.8 %2006: 84.5 %2007: 81.5 %2008: 87.8 %2009: 76.2 %2010: 27.3 %2011: 72.8 %2012: 66.7 %2013: 72.5 %2014: 88.6 %2015: 85.1 %2016: 75.9 %2017: 65.5 %2018: 78.1 %2019: 86.5 %2020: 81.4 %2021: 78.1 %2022: 84.9 %2023: 85.9 %2024: 84.9 %2025: 96.3 %
%. Source: Invokely calculation with data from EPA. Retrieved 2026-10-12, published 2026-07-13.
All 22 values
Period%
202596.3
202484.9
202385.9
202284.9
202178.1
202081.4
201986.5
201878.1
201765.5
201675.9
201585.1
201488.6
201372.5
201266.7
201172.8
201027.3
200976.2
200887.8
200781.5
200684.5
200574.8
200450

Franklin County compared with nearby places

Ada County: 74 %Bannock County: 88.8 %Benewah County: 63.4 %Blaine County: 96.6 %Boise County: 70.4 %Bonner County: 56.2 %Bonneville County: 93 %Butte County: 90.1 %Canyon County: 77.1 %Custer County: 96.9 %Franklin County: 96.3 %Idaho County: 71.8 %Kootenai County: 77.8 %Latah County: 83.4 %Lemhi County: 71.5 %Nez Perce County: 72.5 %Shoshone County: 56.2 %Twin Falls County: 92.9 %Valley County: 73.3 %
  • Under 71
  • 71 to 73
  • 73 to 82
  • 82 to 93
  • 93 and over
  • No data
Share of days with good air quality (US EPA AQI), 2025, %. 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

Days with a daily Air Quality Index of 0 to 50 (good) as a percentage of the days of the year with an AQI in a US county. Calculated by Invokely from the day counts in the EPA AirData annual summaries; both counts are stored with each value.

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.

Report a problem with this figure

How to cite

U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. 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: good days as a share of days with an AQI, calculated with stored counts (Share of days with good air quality (US EPA AQI), 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: good days as a share of days with an AQI, calculated with stored counts, Share of days with good air quality (US EPA AQI), 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/good-air-quality-days-share/franklin-county-idaho. Accessed 12 Oct. 2026.

Chicago (author-date)

U.S. Environmental Protection Agency. 2026. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Share of days with good air quality (US EPA AQI), 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/good-air-quality-days-share/franklin-county-idaho.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts, Share of days with good air quality (US EPA AQI), Franklin County, 2004 to 2025 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/good-air-quality-days-share/franklin-county-idaho (Accessed: 12 October 2026).

BibTeX
@misc{environmental_share_of_days_with_2025,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts: Share of days with good air quality (US EPA AQI), 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/good-air-quality-days-share/franklin-county-idaho. Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. 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: good days as a share of days with an AQI, calculated with stored counts: Share of days with good air quality (US EPA AQI), 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/good-air-quality-days-share/franklin-county-idaho
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/good-air-quality-days-share/franklin-county-idaho.
N1  - Publisher attribution: U.S. Environmental Protection Agency, Air Quality System, AirData. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual. Retrieved 2026-10-12.
ER  -
Embed this chart

Paste this code into a web page or a blog post. The chart shows the latest figures as they are published, with the source and a link back to this page.

Sites that read oEmbed links, such as WordPress, can show the chart when you paste the link to this page.

Use this data in your AI agent

Invokely serves this figure to AI assistants through MCP and to code through a REST API, with the source and citation attached. Ask your assistant:

What is the latest share of days with good air quality (US EPA AQI) in Franklin County? Cite the source.
get_value {"indicator":"aqi_good_days_share","place":"us-county-16041"}
GET https://invokely.ai/api/v1/value?indicator=aqi_good_days_share&place=us-county-16041

Connect Claude, ChatGPT or Cursor in one step. The trial answers 25 calls a day without an account.

Questions

What is the share of days with good air quality (US EPA AQI) in Franklin County?

Share of days with good air quality (US EPA AQI) in Franklin County was 96.3% in 2025, according to EPA. That is up 11.4 pts from 2024.

Where does this figure come from?

U.S. Environmental Protection Agency. EPA AirData annual AQI by county: good days as a share of days with an AQI, calculated with stored counts. Retrieved by Invokely on 2026-10-12.

What was the highest share of days with good air quality (US EPA AQI) in Franklin County?

96.3% in 2025, the highest value since 2004 in this series.

Related statistics for Franklin County

All statistics for Franklin County | Franklin County in figures