Place Bellevue in Lyon. (@BonjourLyon)

The air quality in Lyon and the Lyon metropolitan area will remain average to poor this Wednesday, December 31, 2025.

We are breathing a little easier this Wednesday in Lyon even if the air quality remains degraded over a large part of Lyon. This December 31, 2025, the concentrations of pollutants are still high, particularly with regard to multi-pollutants and fine particles.

Over a large part of the Lyon metropolitan area, the air quality will remain degraded this Wednesday with weather conditions less dispersive than the day before.