In November 2019, in order to promote the prevention and control of air pollution in key industries and improve the level of green development in key industries, the Department of Ecological Environment of Henan Province held a mobilization meeting to organize batches of electroplating, casting, glass, corundum, oil mining and processing, 9 key industries including brick and tile kilns, gold smelting, beer manufacturing, and sewage treatment have carried out special research activities on the status of green development. This event marked the start of the survey on the green development of 26 key industries in Henan Province.