In addition, 13 dec Affected by cold air, according to the national meteorological center, at present, the central and southern Beijing, tianjin, hebei and other places of haze has weakened, therefore, to remove haze yellow warning. 13 to 15 night, central and southern north China, west of huanghuai, shaanxi guanzhong is intermittent haze weather, give priority to with mild to moderate haze. 15 night, air diffusion condition slip, 16 central and southern north China and huanghuai, shaanxi guanzhong will out...