There are two LEZ in Flanders: one in the city of Antwerp and the other in the city of Ghent. The Brussels-Capital Region is also a LEZ.
If you intend to visit one of these areas, make sure to check the conditions of access to see whether you have to prepare yourself to enter the LEZ. These conditions differ depending on the LEZ. In the years to come, other cities and municipalities will implement a LEZ as well.
More information on the conditions of access: