Where do you have to place the emissions sticker for identifying lowemission vehicles?

You answered correctly. In Germany, the emissions sticker for identifying low-emission vehicles must be placed clearly visible on the inside of the windscreen. This ensures that authorities can easily check the environmental badge from outside the vehicle. Placing it anywhere else, such as on the outside of the windscreen or in the rear window, is not permitted. Proper placement is required to enter low-emission zones legally and to avoid fines. When in doubt, always place such stickers on the inside of the windscreen as specified.