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 19 May 2024: Nantes 6.3 µg/m³, Le Mans 6.3 µg/m³ and Juigné 6.2 µg/m³.
- 1NantesPays de la Loire6.3
- 2Le MansPays de la Loire6.3
- 3JuignéPays de la Loire6.2
- 4La Roche-sur-YonPays de la Loire5.8
- 5AngersPays de la Loire5.8
- 6Montoir-de-BretagnePays de la Loire5.6
- 7Saint-NazairePays de la Loire5.3
- 8DongesPays de la Loire5.3
- 9Saint-Étienne-de-MontlucPays de la Loire5.0
- 10CouëronPays de la Loire5.0
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.