Shanghai Warns Kids, Elderly to Stay Indoors on Heavy Pollution
This article is for subscribers only.
Shanghai warned children and the elderly to stay indoors as smog engulfed the city, sending PM2.5 levels to seven times what the World Health Organization recommends for daily exposure.
The air quality index was 225 as of 9 a.m., signaling “heavy pollution,” the third worst in a six-tier warning system, according to the website of the city’s environmental monitoring center. The PM2.5 pollutant reading was 175.2 micrograms per cubic meter at that time. The WHO recommends exposures of no more than 25 over a 24-hour period for particles that are smaller than 2.5 microns in diameter and more dangerous to human health than other particulate matter.