A combination picture shows a commercial building on a sunny day (L) and a polluted day in Beijing. Pictures taken November 17, 2014 (L) and January 14, 2015 (R). Awareness of the dangers of Beijing's skies is on the rise, thanks to growing data on its air quality. China will "declare war on pollution," Premier Li Keqiang told parliament in an opening address in 2014. A tougher environmental law took effect on January 1, while a new environment minister took charge on Friday. REUTERS/Kim Kyung-Hoon (CHINA - Tags: POLITICS SOCIETY ENVIRONMENT BUSINESS)

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