Where the wind blows: how China's dirty air becomes Hong Kong's problem

Last month there were 300,000 doctor’s visits in Hong Kong linked to smog – much of which wafts over from mainland China. But in a busy town obsessed with money, will it take a direct economic hit to wake people to the danger?At the age of three, Margaux Giraudon developed something akin to a smoker’s cough. Thereafter, she became all too familiar with the inside of her doctor’s office in Hong Kong.For years, her father Nicolas Giraudon was told the same thing by doctors: