Date
17 October 2017

Shanghai PM2.5 reading nearly double national limit, Xinhua says

Shanghai’s PM2.5 reading was nearly double the national limit Sunday as an overcast sky and a weak cold air mass from the north contributed to poor air quality, Xinhua news agency reported Monday. The reading peaked at about 140 micrograms per cubic meter at 6 p.m., nearly double the national limit of 75. Weather forecasters said cloudy skies are expected to return Monday as a high pressure system moves into the city. PM2.5 measures tiny air particulates most harmful to humans.

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