A hazardous, dense haze has enveloped the Pearl River Delta region since Monday, affecting Guangzhou, Foshan, Dongguan and Shenzhen, the official Xinhua news agency reported, citing local environmental authorities. The four cities reported medium to heavy pollution on Monday. Officials blamed unfavorable weather patterns and construction sites without dust prevention measures for the problem, the report said. The smog is expected to persist at least until Wednesday.
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