In China, national observatory yesterday forecast smog to hit north China in the next few days. National Meteorological Center said that starting today, moderate smog will cover Beijing as well as southern Hebei Province. It advised the public to take precautions, and patients with respiratory diseases were told to reduce outdoor activities. <br/><br/>Meteorological experts expect north China to face more smog this autumn and winter due to unfavorable weather conditions. Meanwhile, heavy rain will sweep the country's southwest and the Huanghuai region in the next three days, said the NMC.