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Shanghai’s Pollution Returns After Week of Improved Skies

Shanghai’s pollution worsened after a week of improved air quality as authorities halted some construction and warned children and the elderly to avoid all outdoor activities after PM2.5 pollutants hit nine times the level recommended by the World Health Organization.

The air quality index in China’s commercial hub was 230 as of 2 p.m., indicating “heavy pollution,” the Shanghai Environmental Monitoring Center said on its website today. Particles smaller than 2.5 microns in diameter that are more dangerous than other particulate matter were 225.1 micrograms per cubic meter, the site said. WHO recommends 25 micrograms for 24-hour exposure.