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Shanghai Air Pollution Wanes After Smog Forces Cancellations

Shanghai’s air pollution fell to “light” levels after record smog this month prompted flight cancellations and the city warned children and elderly to stay indoors on at least seven of December’s first nine days.

The city’s PM2.5 air pollution was 63.1 micrograms per cubic meter as of 2 p.m., after hitting 360 micrograms per cubic meter yesterday. Today’s reading is still more than two times higher than the daily exposure level recommended by the World Health Organization. The particles, which are smaller than 2.5 microns in diameter, are more dangerous than other particulate matter, according to the World Health Organization.