Municipality on Thursday issued an orange alert
for air pollution in the next three days.
The orange alert, the second-highest in a four-tier warning system, will be effective from midnight on Thursday, according to the city air pollution emergency response office, Xinhua reported.
An orange alert
means heavy pollution — PM2.5 density of higher than 150 micrograms per cubic meter of air — for three consecutive days.
When the alert is in force, outdoor activities in schools are to be cancelled, and construction projects suspended.
was expected to disperse on Sunday when a cold front is forecast to hit the city, according to the city's meteorological authorities.