BEIJING (Reuters) - Tangshan, China's top steel city, has extended recent emergency pollution control measures until July 21 because a smog warning for the area may reach its second-highest level, according to a document seen by Reuters and a source familiar with the matter.
The measures, which include the closure of some sintering plants and output curbs on coke and cement factories, came into force on July 13.
(Reporting by Muyu Xu and Tom Daly; editing by Jason Neely)
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