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

Median Air Quality Index (US EPA) in Boundary County

Median Air Quality Index (US EPA) in Boundary County was 17 in 2024, according to the U.S. Environmental Protection Agency. That is down 11 from 2023.

2024, index17
Change on 2023-11
Series high282004
Series low172024

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 Boundary County, 1999 to 2024

1517.52022.52527.530199920022004202220241999: 23 index2000: 18 index2002: 26 index2003: 18 index2004: 28 index2005: 28 index2022: 23 index2023: 28 index2024: 17 index152025301999200320241999: 23 index2000: 18 index2002: 26 index2003: 18 index2004: 28 index2005: 28 index2022: 23 index2023: 28 index2024: 17 index
index. Source: EPA, EPA AirData annual AQI by county: median daily AQI. Retrieved 2026-10-12, published 2026-07-13.
All 9 values
Periodindex
202417
202328
202223
200528
200428
200318
200226
200018
199923

Boundary County compared with nearby places

Ada County: 44 indexBannock County: 39 indexBenewah County: 43 indexBlaine County: 19 indexBoise County: 48 indexBonner County: 32 indexBonneville County: 22 indexBoundary County: 17 indexButte County: 42 indexCanyon County: 36 indexCuster County: 6 indexFranklin County: 22 indexIdaho County: 42 indexKootenai County: 24 indexLatah County: 27 indexLemhi County: 37 indexNez Perce County: 29 indexShoshone County: 46 indexTwin Falls County: 23 indexValley County: 37 index
  • Under 22
  • 22 to 28
  • 28 to 37
  • 37 to 42
  • 42 and over
  • No data
Median Air Quality Index (US EPA), 2024, index. Boundary 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), Boundary County, 1999 to 2024) [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), Boundary County, 1999 to 2024. 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/boundary-county-idaho. 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), Boundary County, 1999 to 2024. 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/boundary-county-idaho.

Harvard

U.S. Environmental Protection Agency (2026) EPA AirData annual AQI by county: median daily AQI, Median Air Quality Index (US EPA), Boundary County, 1999 to 2024 [Dataset]. Available at: https://aqs.epa.gov/aqsweb/airdata/download_files.html#Annual, via Invokely: https://invokely.ai/en/median-air-quality-index/boundary-county-idaho (Accessed: 12 October 2026).

BibTeX
@misc{environmental_median_air_quality_index_2024,
  author = {{U.S. Environmental Protection Agency}},
  title = {{EPA AirData annual AQI by county: median daily AQI: Median Air Quality Index (US EPA), Boundary County, 1999 to 2024}},
  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/boundary-county-idaho. 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), Boundary County, 1999 to 2024
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/boundary-county-idaho
Y2  - 2026/10/12
N1  - Accessed via Invokely, https://invokely.ai/en/median-air-quality-index/boundary-county-idaho.
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 Boundary County?

Median Air Quality Index (US EPA) in Boundary County was 17 in 2024, according to the U.S. Environmental Protection Agency. That is down 11 from 2023.

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 Boundary County?

28 in 2004, the highest value since 1999 in this series.

Related statistics for Boundary County

All statistics for Boundary County | Boundary County in figures