Visitors pose for a picture amid haze and smog at Beijing's Tiananmen Square July 8, 2008. Two key measures of pollution in China have fallen slightly in what the country's environmental regulator cast as a victory in the fight for more sustainable development, state media reported on Tuesday. Persistent smog over Olympic host Beijing's skies and a massive algae bloom in sailing venue Qingdao have highlighted China's environmental concerns a month ahead of the Games. REUTERS/Reinhard Krause (CHINA) (BEIJING OLYMPICS 2008 PREVIEW)