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 10 Dec 2025: Montbéliard 13.8 µg/m³, Menton 13.4 µg/m³ and Contes 13.4 µg/m³.
- 1MontbéliardBourgogne-Franche-Comté13.8
- 2MentonProvence-Alpes-Côte d'Azur13.4
- 3ContesProvence-Alpes-Côte d'Azur13.4
- 4MeylanAuvergne-Rhône-Alpes13.0
- 5CrollesAuvergne-Rhône-Alpes13.0
- 6AvignonProvence-Alpes-Côte d'Azur12.7
- 7Romans-sur-IsèreAuvergne-Rhône-Alpes12.1
- 8StrasbourgGrand Est11.7
- 9Mont-de-MarsanNew Aquitaine11.5
- 10GrenobleAuvergne-Rhône-Alpes11.3
- 11LunévilleGrand Est11.2
- 12MulhouseGrand Est11.1
- 13AnnemasseAuvergne-Rhône-Alpes11.0
- 14SorbiersAuvergne-Rhône-Alpes10.7
- 15Saint-AvoldGrand Est10.4
- 16RoubaixHauts-de-France10.4
- 17MarignaneProvence-Alpes-Côte d'Azur10.3
- 18CoulommiersÎle-de-France10.3
- 19ArlesProvence-Alpes-Côte d'Azur10.2
- 20LyonAuvergne-Rhône-Alpes10.1
+ 80 more cities, 10.0 µg/m³ and below
Not counted on this day, too few days measured: Villefranche-sur-Saône since 10 Dec 2025, Douai since 6 Dec 2025, Thionville since 1 Dec 2025 and Béthune since 28 Nov 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 readers for them. Most cities there are missing from this board, not clean. Why.