Shanghai warned children and the elderly to avoid prolonged or heavy outdoor activities for a second day as PM2.5 levels were more than four times the World Health Organization’s recommended guideline for daily exposure.
The air quality index was 185 as of 8 a.m., indicating “moderate pollution,” the third worst in a six-tier warning system, according to the website of the city’s environmental monitoring center. The level of PM2.5 pollutants was 101.6 micrograms per cubic meter. That compares with the WHO guidelines of 25 over a 24-hour period for the particles, which are smaller than 2.5 microns in diameter and are more dangerous than other particulate matter.
Shanghai saw record levels of smog earlier this month, forcing flight cancellations and prompting the government to order vehicles off the road and warn children from going outside. The pollution index surged to a record 482 on Dec. 6, reaching the highest “severe” level, according to the China Daily.
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