"Dense, choking smog blanketed several northern cities yesterday, with visibility in some areas reduced to less than 10 metres. Drivers complained they were unable to see traffic lights."
"Air pollution in Harbin, capital of Heilongjiang province, rose above the highest point on the government's index for the second consecutive day. The city was forced to take the unprecedented step of closing kindergartens, primary and middle schools because of the smog.
In nearby Jilin province, Changchun and Jilin also suffered severe air pollution. Most of the province's main highways were closed."