Rare pink smog blankets Nanjing

Rare pink smog shrouds Nanjing, capital city of eastern China’s Jiangsu province, on the evening of Dec. 22, 2015. Meteorological expert Liu Hongnian, who is also a professor of Nanjing University, said the pink smog was the result of sunset glow instead of special combination of pollutants. The public should not panic about it. (Photo/china.com)