What are the main reasons for the poor air quality in Changchun?

Industrial and traffic emissions: Changchun is an industrial and traffic hub city, and industrial and traffic exhaust and exhaust emissions are one of the main reasons for poor air quality in Changchun.

Weather conditions: Changchun is located in the northeast, with a cold climate, low air pressure, high humidity and heavy snowfall in winter. All these factors may lead to the accumulation and difficult distribution of pollutants in the air, thus aggravating air pollution.

Coal pollution: Many areas in Changchun still use coal for heating, and the emission of pollutants such as particulate matter and sulfur dioxide caused by coal combustion seriously affects air quality.

Domestic garbage disposal: Changchun garbage disposal facilities and methods may also be one of the factors that cause air pollution, because harmful substances in garbage may be released into the air if they are not handled properly.