Harbin lies in the north of China where winter temperatures can drop to -40℃, demanding a six-month heating season．Daily particulate levels of more than 40 times the World Health Organization recommended maximum level were reported in parts of Harbin．The smog remained till 23 October, when almost all monitoring stations in Heilongjiang, Jilin, and Liaoning Provinces

　　reported readings above 200μg/m³forPM2．5．PM2．5 is the amount of particulate matter less than 2．5 micrometers in diameter in the air, with the WHO recommending a maximum 24-hour mean （平均值） of 25 micrograms per cubic meter （μg/m³）．On the morning of 25 October, PM2．5 measurements in Harbin had fallen to an average of 123μg/m³．

　　All highways in the surrounding Heilongjiang Province were closed．In Harbin, all primary and middle schools were closed for three days and authorities stopped flights at the airports．Hospitals reported a 23 percent increase in admissions for breathing problems．However, this smog will have no influence on Harbin Ice Festival events later in December 2017．

　　Air pollution in Chinese cities is of increasing concern to China’s leadership．Particulates in the air can affect human health and also have influences on climate and rainfall．Pollution from the burning of coal has reduced life expectancy by 5．5 years in the north of China, as a result of heart and lung diseases．

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