Fine dust sticker/ environmental sticker issue
Source: BUS Rheinland-PfalzClean air plans exist for areas with poor air quality. Clean air plans contain measures to improve air quality. Environmental zones are one possible measure of such clean air plans. Environmental zones reduce particulate matter and nitrogen dioxide pollution. Vehicles with high pollutant emissions are not allowed to drive in environmental zones.
If you want to drive your vehicle in such an environmental zone, you must purchase a fine dust sticker/environmental sticker. The sticker is available in three different colors, each of which is assigned to a pollutant group. The classification of your vehicle into one of the pollutant groups is based on the emission code numbers. You can find these in the vehicle documents.
Notice: The environmental zones are indicated by a separate traffic sign. The additional sign indicates the colors of the stickers with which vehicles have free passage in the specific environmental zone.