SmogRank / History / City race
Cities in France, worst air first, day by day
Each measured city's average over the 30 days to every day since January 2023, worst first. Find your own city to follow it through the race, or keep to one country.
The worst cities in France for PM2.5 over the 30 days to 17 Jan 2025: Marignane 21.1 µg/m³, Arles 16.7 µg/m³ and Le Havre 16.3 µg/m³.
- 1MarignaneProvence-Alpes-Côte d'Azur21.1
- 2ArlesProvence-Alpes-Côte d'Azur16.7
- 3Le HavreNormandy16.3
- 4MeylanAuvergne-Rhône-Alpes15.6
- 5CrollesAuvergne-Rhône-Alpes15.6
- 6AvignonProvence-Alpes-Côte d'Azur15.2
- 7MontpellierOccitanie14.9
- 8Salon-de-ProvenceProvence-Alpes-Côte d'Azur14.6
- 9GrenobleAuvergne-Rhône-Alpes14.0
- 10DouaiHauts-de-France13.1
- 11ParisÎle-de-France13.0
- 12DenainHauts-de-France12.8
- 13CoulommiersÎle-de-France12.8
- 14MarseilleProvence-Alpes-Côte d'Azur12.6
- 15Boulogne-sur-MerHauts-de-France12.6
- 16DunkirkHauts-de-France12.0
- 17RambouilletÎle-de-France11.4
- 18ReimsGrand Est11.3
- 19ValenciennesHauts-de-France11.2
- 20Aix-en-ProvenceProvence-Alpes-Côte d'Azur11.2
+ 15 more cities, the next at 10.8 µg/m³
Not counted on this day, too few days measured: Toulouse since 14 Jan 2025, Perpignan since 14 Jan 2025, Nîmes since 14 Jan 2025 and 37 more cities.
Cities counted each day
A city's number is its average over the 30 days, shown only when 21 of them were measured (5 of 7 on the 7-day race), the same minimum as the 30- and 7-day boards. A city whose monitors go quiet fades out where it stood rather than sliding down, so a gap never reads as cleaner air. Some large countries are thin or missing because their monitors' licences don't allow reuse. How we rank.
Not covered: the government monitoring networks of China and Turkey, which publish only on their own websites. We are building the reader for China's network. Turkey's network doesn't answer requests from outside the country, so we can't read it. Most cities there are missing from this board, not clean. Why.