 Buildings stand in fog shrouded Yantai city, east China's Shandong province, Feb 21, 2011. Many areas in China witnessed heavy fog on Monday. China's National Meteorological Center (NMC) has issued a yellow alarm against fog. [Photo/Xinhua] |
 Redisential buildings stand among the advection fog in Yantai city, east China's Shandong province, Feb 21, 2011. The advection fog occurs when moist air passes over a cool surface by advection (wind) and is cooled. It is common as a warm front passes over an area with significant snowpack. [Photo/CFP] |
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