Citizens ride in heavy fog in Nanchang, capital of east China's Jiangxi Province, Jan. 26, 2013. (Xinhua/Zhou Ke)

A cultural square is shrouded in heavy fog in Nanchang, capital of east China's Jiangxi Province, Jan. 26, 2013. (Xinhua/Song Zhenping)

Buildings are shrouded in heavy fog in Nanchang, capital of east China's Jiangxi Province, Jan. 26, 2013. (Xinhua/Song Zhenping)

Buildings are shrouded in heavy fog in Nanchang, capital of east China's Jiangxi Province, Jan. 26, 2013. (Xinhua/Zhou Ke)

A cultural square is shrouded in heavy fog in Nanchang, capital of east China's Jiangxi Province, Jan. 26, 2013. (Xinhua/Song Zhenping)

Vehicles run on fog-shrouded bridge in Nanchang, capital of east China's Jiangxi Province, Jan. 26, 2013. (Xinhua/Zhou Ke)