圖片大圖：
Sun Ying, the hostess
By Wang Rui
Du Shaozhong, deputy director of the Beijing Municipal Environmental Protection Bureau
By Wang Rui
Guo Hu, chief and spokesman of the Beijing Meteorological Station
By Wang Rui
A reporter from China Radio International asks questions.
By Wang Rui
Speakers at the press conference
By Wang Rui
A reporter from The Christian Science Monitor raises questions.
By Wang Rui
A reporter from China Youth Daily asks questions.
By Wang Rui
A journalist from Phoenix TV asks questions.
By Wang Rui
A reporter from CCTV raises questions.
By Wang Rui
