Independent (UK): Hong Kong’s leading authority on air quality said Thursday he is leaving the city to avoid its polluted air and keep his respiratory problems under control. Anthony Hedley, who created the Hedley Environmental Index, which tracks the public health and economic costs of Hong Kong air pollution in real time, is relocating to the Isle of Man off the west coast of Britain. “I need to reduce my exposure to polluted air because I know from experience that my respiratory symptoms …