Zhengzhou city, Henan Province, issued on September 25 its guideline for improving air quality in the heating season, from October to March. The guideline requires at least 30% of capacity closure for aluminum smelters and alumina refineries and at least 50% of capacity closure for aluminum fabricators. Carbon plants that do not meet the limit of emission shall be suspended and carbon plants that meet the requirement shall curtail more than 50 percent of their capacities.

Source: http://www.zhengzhou.gov.cn/html/www/news1/20170926/536377.html

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