SmogRank / World / France / Auvergne-Rhône-Alpes / 2025
Most polluted cities in Auvergne-Rhône-Alpes, France, 2025
14 cities in Auvergne-Rhône-Alpes, France ranked by their average PM2.5 over the 365 days; 14 above the WHO annual guideline (5.0 µg/m³). Worst: Romans-sur-Isère at 10.8 µg/m³, #743 of 2,624 cities in the world. Cleanest: Aurillac at 5.1. A city needs measurements on 70% of the days to be ranked.
About 13.6K people in these 2 cities breathed unhealthy air on an average day of 2025.
Ranked by people: each city's population times its share of unhealthy days, those with a daily mean over 35.4 µg/m³ (US AQI 101+). That is how many people living there breathed unhealthy air on an average day. Only cities measured at 2 or more places at least 3 km apart are ranked: one monitor shouldn't speak for a whole city. Population is the city itself, not its wider metro area.
- 1Lyon 13.2K
- 2Clermont-Ferrand 482
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, 2025, smogrank.com/fr/region/auvergne-rhone-alpes/history/2025 (accessed 7 Oct 2026).
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.