On September 12, 2013, the State Council officially announced the action plan for air pollution prevention and control, which is considered to be the most stringent action plan for air pollution control in China's history and will be the action guide for national air pollution prevention and control at present and in the future. The action plan proposes that after five years of efforts, the overall air quality of the country will be improved and the heavily polluted weather will be greatly reduced; The air quality in Beijing Tianjin Hebei, Yangtze River Delta and Pearl River Delta has improved significantly. We will strive to gradually eliminate the heavily polluted weather in five years or more, and significantly improve the air quality throughout the country. The specific indicators are as follows: by 2017, the concentration of inhalable particulate matter in prefecture level and above cities in China has decreased by more than 10% compared with that in 2012, and the number of excellent days has increased year by year; The concentration of fine particles in Beijing Tianjin Hebei, Yangtze River Delta and Pearl River Delta decreased by about 25%, 20% and 15% respectively, of which the annual average concentration of fine particles in Beijing was controlled at about 60 µ g / m3. In order to achieve the above objectives, the action plan also identified 10 specific measures, including strengthening comprehensive treatment and reducing multi pollutant emissions. For the first time, fine particles are included in the binding indicators, and whether the environmental quality is improved is included in the assessment system of relevant officials. If the annual objectives and tasks are not completed, Supervisory organs should investigate the responsibilities of relevant units and personnel according to law and discipline. In addition, it is also required to implement environmental information disclosure, accelerate the elimination of backward production capacity, and establish a heavy pollution weather monitoring and early warning system.