Smokestack industries are based in a small number of provinces such as Shandong in the east and Shanxi in the north.
烟囱工业主要分布在华东的山东和华北的山西等少数几个省份。
英语百科
Smokestack industry
A smokestack industry is a basic, usually cyclical, manufacturing industry.
The factories stereotypically used in such industries have flue gas stacks, hence the name, and produce a high volume of pollution.