I occasionally need to drive into Germany for work and since I'm usually taking a rental car it can be troublesome to obtain an Umweltzone sticker while on the road. Therefore it is useful to know where exactly do all the Umweltzones begin and end.
Is there a comprehensive official map of all the German environmental zones? There are websites which list the cities where the Umweltzone sticker is mandatory, but their maps are not detailed enough to see the exact border of each zone.