The cost of clean airMeasures to combat air pollution are biting hard in industrial areas already hit by an economic slowdown A DESOLATE scene surrounds Little Zhangâs Tyre Repair in the dusty rock-mining township of Shijing, in the northern province of Hebei. Zhang Minsheng, the owner, still gets some business from passing traffic. But the recent closure of nearby rock quarries, because of air-po
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