Dense fog shrouded Chengdu Shuangliu International Airport, southwest China's Sichuan Province, Feb .6. The airport was forced to close at 2:30 a.m. on Wednesday as the visibility dropped to less than 30 meters. Nearly 9,000 passengers have been left stranded at the airport. The local meteorological authorities expected that the heavy fog wouldn't thin out until 11:00 a.m. [Chinanews.com]