Shanghai ordered schools to keep students indoors as air quality in China’s commercial center deteriorated.
The city was “heavily polluted” Thursday morning, the second worst of a six-grade scale, according to Shanghai’s Air Quality Index. The concentration of PM2.5 particles -- the most hazardous to people’s health -- reached 183 micrograms per cubic meter as of 7 a.m., the Shanghai Environmental Monitoring Center said on its website. The World Health Organization recommends daily PM2.5 exposure of no more than 25.
In addition to ordering schools to keep students indoors, the city also advised the elderly to avoid outdoor activity and for drivers to exercise caution because of hazy conditions. The monitoring center forecast pollution will drop to “light” levels by Thursday afternoon.
Shanghai has experienced several bouts of heavy pollution this month, with levels of PM 2.5 rising to their worst in two years on Dec. 15, prompting the city take emergency measures including limiting factory production.
— With assistance by Qi Ding