How to prevent inhaling PM2.5 in foggy weather in Hefei?

The main sources of PM2.5 are industrial waste gas produced by artificial combustion of minerals such as coal and oil, and tail gas emissions produced by motor vehicles, including dust, sulfuric acid, nitric acid, organic hydrocarbons and other particles dispersed in the air, cigarette smoke and other secondary pollutants formed through a series of photochemical reactions, which belong to human production and living emissions. Therefore, people should do a good job in environmental protection for ZRA air purification, and everyone should contribute their own strength.