Towards diesel traffic restrictions in Freiburg?

The German city of Freiburg, located 50 km from Colmar on the other side of the french border, already has an environmental zone. Foreign vehicles, including French ones, must therefore already have the green badge to drive in the city. In the next air protection plan planned for 2020, Euro-4 diesel vehicles could also be affected by traffic bans. This would then directly affect French frontier workers.