When did the smog begin in China?

20 13. according to the information of Chinese government network, many places in central and eastern China suffered from haze weather at the beginning of 20 13, with reduced visibility and serious air pollution. 65438+1since October 9, a wide dark brown "pollution zone" has been found in Beijing, Tianjin and Hebei, three northeastern provinces, Shaanxi, Henan, Hubei, Hunan, Anhui and some eastern coastal cities.