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It is hard to forget the days of heavy haze earlier this year in Beijing. Recently, severe smog reappeared during the National Day holiday.
On September 30, there were more than 200 micrograms of PM2.5 particles in each cubic meter of air in the capital city. The smog made Swedish tennis player Robert Lindstedt complain at the China Open: "How much of your life disappears when you spend your time here?"
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