Green-Zones.eu is a German mobile app that tracks environmental zones throughout Europe. It tracks the status of information such as driving bans, air quality, and local environmental rules and associated fines. The website sells environmental badges for various European countries. Environmental badges are stickers that are affixed to cars that meet minimum emissions requirements. These stickers are required to be on cars that travel through some designated environmental green zones, or else they risk a heavy fine. This is to keep the environmental impact of heavy traffic on a city to a minimum.