SmogRank / World / United States / Idaho / August 2023

Most polluted cities in Idaho, United States, August 2023

14 cities in Idaho, United States ranked by their average PM2.5 over the 31 days. Worst: Sandpoint at 19.9 µg/m³, #123 of 1,926 cities in the world. Cleanest: Preston at 4.5. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Lewiston 13% 10%0
Every city in Idaho, United States ranked for August 2023, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1Lewiston
    13%
  2. 2Sandpoint
    10%
  3. 3Coeur d'Alene
    10%
  4. 4Moscow
    6%
  5. 5Weiser
    0%
  6. 6Nampa
    0%
  7. 7Meridian
    0%
  8. 8Rexburg
    0%
  9. 9Garden City
    0%
  10. 10Conda
    0%
  11. 10Idaho Falls
    0%
  12. 12Pocatello
    0%
  13. 12Twin Falls
    0%
  14. 14Preston
    0%
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

All cities in the world, August 2023 · All cities in United States, August 2023 · Idaho now

Use this board

SmogRank, most polluted cities in Idaho, United States, PM2.5, August 2023, smogrank.com/us/region/idaho/history/2023-08 (accessed 6 Oct 2026).

Download top 10 (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.