Pollution in Lyon: Air quality deteriorates this Tuesday

View of Lyon on the banks of the Rhône @CM

Air quality is deteriorating this Tuesday, May 13, 2025 in Lyon with the return of sunshine and the increase in atmospheric pollutants.

Sunshine often means pollution in Lyon. While Tuesday, May 13, 2025, looks set to be a beautiful spring day, the air quality situation over Lyon will deteriorate. These weather conditions will encourage the resumption of ozone formation, causing the Atmo index to decline.

Thus, across the entire Lyon metropolitan area, concentrations of multi-pollutants and ozone will be reduced, while sulfur dioxide and fine particles will remain in limited quantities this Tuesday.