SmogRank / World / France / Auvergne-Rhône-Alpes / January 2025

Most polluted cities in Auvergne-Rhône-Alpes, France, January 2025

7 cities in Auvergne-Rhône-Alpes, France ranked by their average PM2.5 over the 31 days. Worst: Crolles at 16.0 µg/m³, #439 of 2,426 cities in the world. Cleanest: Aurillac at 4.8. 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.

← Lyon 14% 10%0
Every city in Auvergne-Rhône-Alpes, France ranked for January 2025, 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. 1Lyon
    14%
  2. 2Grenoble
    13%
  3. 3Crolles
    9%
  4. 4Moulins
    4%
  5. 5Clermont-Ferrand
    4%
  6. 6Vichy
    0%
  7. 7Aurillac
    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

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SmogRank, most polluted cities in Auvergne-Rhône-Alpes, France, PM2.5, January 2025, smogrank.com/fr/region/auvergne-rhone-alpes/history/2025-01 (accessed 7 Oct 2026).

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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.