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 11 Jun 2025: Aix-en-Provence 11.5 µg/m³, Arles 9.8 µg/m³ and Reims 9.7 µg/m³.
- 1Aix-en-ProvenceProvence-Alpes-Côte d'Azur11.5
- 2ArlesProvence-Alpes-Côte d'Azur9.8
- 3ReimsGrand Est9.7
- 4MarseilleProvence-Alpes-Côte d'Azur9.3
- 5MarignaneProvence-Alpes-Côte d'Azur9.2
- 6AvignonProvence-Alpes-Côte d'Azur8.7
- 7RoubaixHauts-de-France8.4
- 8ParisÎle-de-France8.2
- 9Le HavreNormandy8.2
- 10ValenciennesHauts-de-France8.0
- 11AuriolProvence-Alpes-Côte d'Azur7.9
- 12Salon-de-ProvenceProvence-Alpes-Côte d'Azur7.7
- 13CoulommiersÎle-de-France7.7
- 14PoitiersNew Aquitaine7.5
- 15DenainHauts-de-France7.5
- 16MetzGrand Est7.1
- 17AngoulêmeNew Aquitaine7.1
- 18Clermont-FerrandAuvergne-Rhône-Alpes7.0
- 19Saint-AvoldGrand Est6.7
- 20NiortNew Aquitaine6.5
+ 6 more cities, 6.5 µg/m³ and below
Not counted on this day, too few days measured: Dunkirk since 10 Jun 2025, Calais since 10 Jun 2025, Boulogne-sur-Mer since 10 Jun 2025 and 40 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 readers for them. Most cities there are missing from this board, not clean. Why.