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 Apr 2025: Dunkirk 16.3 µg/m³, Roubaix 14.2 µg/m³ and Béthune 13.9 µg/m³.
- 1DunkirkHauts-de-France16.3
- 2RoubaixHauts-de-France14.2
- 3BéthuneHauts-de-France13.9
- 4ValenciennesHauts-de-France13.5
- 5ReimsGrand Est13.5
- 6DouaiHauts-de-France13.5
- 7DenainHauts-de-France13.1
- 8Le HavreNormandy13.0
- 9AmiensHauts-de-France13.0
- 10CherbourgNormandy12.6
- 11Saint-QuentinHauts-de-France12.0
- 12ParisÎle-de-France12.0
- 13NancyGrand Est11.9
- 14CreilHauts-de-France11.9
- 15CoulommiersÎle-de-France11.5
- 16RouenNormandy11.3
- 17DieppeNormandy11.2
- 18RennesBrittany11.0
- 19CaenNormandy10.9
- 20LouviersNormandy10.4
+ 76 more cities, the next at 10.4 µg/m³
Not counted on this day, too few days measured: Calais since 15 Apr 2025, Bellegarde-sur-Valserine since 12 Mar 2025 and Boulogne-sur-Mer since 2 Mar 2025.
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.