A combination picture shows Beijing's hazy sky (L) on February 24, 2014 and clear sky on February 27, 2014, from the top of Jingshan Park near the Forbidden City. China's environment ministry has vowed to “harshly punish” factories and power plants that contributed to a hazardous smog which enveloped much of Northern China, official state media reported on Wednesday. (Photo by Kim Kyung-Hoon/Reuters)
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