Shouldn't we ban internal combustion engine cars by law? The air in underground parking lots is really bad. It's all because of the exhaust from internal combustion engine cars, and the problem is that it's quite harmful to our health. Not only diesel but gasoline vehicles also contain carcinogenic substances in their exhaust. Especially in winter, many cars are preheated, and incomplete combustion occurs at low temperatures. There are ventilation facilities, but they don't eliminate emissions as effectively as the ambient air.