Low Emission Zone Hannover breathes easy Only cars displaying a green disc (Grüne Plakette) may drive within the Low Emission Zone in Hannover. © Landeshauptstadt Hannover The green disc signals driving permission in the Low Emission Zone Low Emission Zones are marked by road signs on its borders. The brochure "Hannover - Low Emission Zone" has answers to the most common questions on the topic. Brochure "Hannover - Low Emission Zone" Format: pdf Size: 337.3 kB Download