 A police car is seen at the fog-covered Tian'anmen Square in Beijing, capital of China, Feb. 21, 2007. Sections of seven Beijing and ten Tianjin highways closed due to the thick fog that smothered north China on Wednesday morning.
 Automobiles moved slowly through thick fog in Beijing, capital of China, Feb. 21, 2007.
 An electronic billboard shows that the expressway from Beijing to Shijiazhuang has been closed due to heavy fog in Beijing, capital of China, Feb. 21, 2007.
 People ride bicycles in thick fog in Beijing, capital of China, Feb. 21, 2007.
 Automobiles moved slowly through thick fog in Beijing, capital of China, Feb. 21, 2007.
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