the DGT Environmental Distinction and DGT Pollution Sticker app you can:Know with your registration that DGT Environmental Distinction hasBe informed of the latest news from the DGTBuy DGT Pollution Sticker directly from the appThe DGT Environmental Badge is a label that allows you to quickly identify the most environmentally friendly vehicles. It must be placed in the lower right corner of the windshield and, although it is voluntary, it is recommended to have it:Material: adhesiveSize: diameter 97mm (vehicles and vans) and 87mm (motorcycles).There are four types of Badge, depending on the potential contaminant: