Belgium has four Low Emission Zones in place: Antwerp, Brussels, Ghent and one covering the Wallon Region.

Please note that you do not need stickers for the Belgian Low Emission Zones. Foreign vehicles must be registered, which is free of charge.
Be carful, some websites sell stickers for Belgium that are not needed and not valid.
For more information, see the "National Scheme" section of the Low Emission Zone city pages.

Belgium also has various LTZs, car-free zones and pedestrian areas in place.

All regions have Emergency Zones that are activated when certain pollution levels are exceeded.

Brussels also has a Zero Emission Zone in Bruxelles in place.