In 2016, about 4.2 million people died due to air pollution, according to WHO. 80% of urban residents are exposed to dangerous levels of air pollution. Vehicles are the main cause of air pollution and burn a lot of fossils fuel. Carbon emissions from car vehicles are the largest contributor of climate change. In my opinion, an international car-free day would be effective to reduce air pollution temporarily because it only works for one or two days that cars are not being used. Banning and reducing the use of fuel must be the best way to reduce air pollution.