The conditions showed no signs of easing Sunday, the official news agency Xinhua reported
Nearly all expressways in the eastern province of Jiangsu were closed, and though traffic resumed on certain roads in the afternoon, it remained slow, local traffic authorities told the agency.
In the provincial capital of Nanjing, visibility dropped to near 50 yards in some areas. The local airport said there were delays or cancellation of more than 100 flights.
Traffic also temporarily was suspended on several expressways in Beijing, Xinhua said. As winds picked up, those suspensions were lifted.
which became smoggy on Saturday.
Xinhua said large parts of China have been plagued by foggy or smoggy weather since the start of December.