It's probably residents far from the city center that hate the LEZ. Most residents in the center would likely prefer the whole center to be closed to cars, as public transportation is quite good there.
Notice that the politician in question is not a candidate for mayor of the city, it's the candidate governor of the whole region around the city.
Notice that the politician in question is not a candidate for mayor of the city, it's the candidate governor of the whole region around the city.