Meteorological authorities in Heilongjiang, Jilin and Liaoning provinces issued a red alert for thick smog or fog.
The fog will worsen in Harbin, Yichun, Daqing, Suihua, Jiamusi and Qitaihe cities in Heilongjiang with visibility of less than 100 metres in the next 24 hours, official media quoted the provincial meteorological station as saying.
The density of PM2.5 -- airborne particles measuring less than 2.5 microns in diameter, exceeded 500 micrograms per cubic meter early today in Harbin prompting complaints from public over health hazards.
Harbin's education authorities issued a notice to suspend classes at all primary and middle schools.
Some public buses also stopped running in Harbin. Many citizens had to walk or use other means of transport to work. Drug stores in the city were selling out of masks.
"The sale of masks was at least ten times the normal rate. We sold more than 140 masks this morning in our shop," state-run Xinhua news agency quoted a salesman of a drug store in Xiangfang District, Harbin as saying.
Highways were closed and flights disrupted in Jilin and Liaoning.
"The building 50 metres away cannot be seen clearly. I smelt irritating coal smoke when I opened the window of my house," said Sun Qi, a resident in Changchun, provincial capital of Jilin.
"We were scared by such thick fog when we opened the door to go out. The air quality is so poor outside and the smell irritative. We have to stay at home," said 74-year-old Zhong Jinfeng in Changchun.
The meteorological station in Changchun issued a red alert.
Many pedestrians and traffic police were wearing masks.
The weather also delayed trains and caused the closure of most of the highways in Jilin.
Sunday was the beginning of the heating season in Harbin. Heating supply companies have also begun operation in Jilin.
The big pollutant emissions from coal-burning, vehicle exhaust and the burning of crop stalk on the outskirts and slight winds, were all factors leading to the smoggy weather, according to environmental authorities in Heilongjiang.
Air pollution has become one of the major public concerns in China after decades of rapid development.
In September, the country announced a government action plan to tackle air pollution, pledging to cut coal use, shut down polluters and promote cleaner production.
The plan also aims to cut the density of inhalable particulate matter by at least 10 per cent in major cities nationwide by 2017.
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