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.

CountriesCities
The 30 days to12 Apr 2025 That day's board

The worst cities in France for PM2.5 over the 30 days to 12 Apr 2025: Dunkirk 15.9 µg/m³, Roubaix 15.2 µg/m³ and Béthune 15.1 µg/m³.

  1. 1DunkirkHauts-de-France15.9
  2. 2RoubaixHauts-de-France15.2
  3. 3BéthuneHauts-de-France15.1
  4. 4ReimsGrand Est14.7
  5. 5DouaiHauts-de-France14.4
  6. 6ValenciennesHauts-de-France14.2
  7. 7Le HavreNormandy14.0
  8. 8CalaisHauts-de-France13.8
  9. 9DenainHauts-de-France13.7
  10. 10AmiensHauts-de-France13.6
  11. 11CreilHauts-de-France13.5
  12. 12ParisÎle-de-France13.3
  13. 13CoulommiersÎle-de-France13.3
  14. 14NancyGrand Est12.9
  15. 15RennesBrittany12.8
  16. 16CherbourgNormandy12.8
  17. 17Saint-QuentinHauts-de-France12.5
  18. 18RouenNormandy12.4
  19. 19DieppeNormandy12.0
  20. 20CaenNormandy11.9

+ 79 more cities, 11.8 µg/m³ and below

Not counted on this day, too few days measured: Bellegarde-sur-Valserine since 12 Mar 2025, Bourg-en-Bresse since 11 Mar 2025 and Boulogne-sur-Mer since 2 Mar 2025.

30 days7 days
GoodModerateSensitive groupsUnhealthyVery unhealthyHazardousWHO 24-hour guideline, 15 µg/m³Fades where it stood: not counted that 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 readers for them. Most cities there are missing from this board, not clean. Why.