The Ministry of Ecology and Environment issued the “Action Plan for Comprehensive Treatment of Air Pollution” across the Yangtze River Delta region (including Shanghai, Nanjing, Wuxi, Hangzhou, Ningbo, Hefei). The restrictions will target 39 key industries such as steel, building materials, non-ferrous metals, coking, casting, petrochemical, chemical, packaging and printing, and industrial coating. Targets include controlling unorganised emissions, reducing excess production capacity and eliminating outdated production capacity. SMM has compiled  a comparison of the documents for 2019-2021.