The notorious smog that blights Beijing improved sharply in the first quarter this year as measures to curb pollution took effect, according to Chinese data collated by environmental group Greenpeace.
Many other big cities recorded similar falls in pollution but elsewhere in the country air quality remains extremely poor and might worsen as government measures to move heavy industry into poorer regions take effect, it said.
Noxious air in many parts of China has become a political liability that Beijing has sought to counter with policies aimed at reducing industrial and vehicle emissions in the most populous and prosperous centres.
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