"The 13 cities of Jinan, Zibo, Zaozhuang, Dongying, Weifang, Jining, Tai 'an, Rizhao, Linyi, Dezhou, Liaocheng, Binzhou and Heze are the key areas. By 2025, fine particulate matter (PM) in Shandong Province2.5) The average annual concentration reaches 38 micrograms/cubic meter, the proportion of days with good air quality reaches 72.5%, the proportion of days with severe and above pollution does not exceed 0.9%, and the emission reductions of key projects of NOx and VOCs are no less than 150,700