Well, jokes aside, they only try to control 2T scooters - yep, those things smoke like it’s hell, but 2T scooters are minority, most of them are 4T. They still smoke’n’smell, but less. General idea is just forbid petrol scooters in metropolitan areas, like Hangzhou in China did. Either you use electric ones or you ride something else. Problem of Taiwanese drivers on SILENT scooters is for another topic.