新闻报告类
b
smoggy weather has become common in
the city was essentially shut down after pm2. 5, fine particulate(微粒物) pollution that is considered hazardous(有害的) . reached levels of 1000 micrograms per cubic meter-40 times the safety level remended by the world health organization. schools, motorways and an airport were closed on tuesday as visibility in some areas of the city dropped to less than 10 meters.
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