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Ambient air pollution in China poses a multifaceted health threat to outdoor physical activity
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    Evidence of a lack of beneficial effect of outdoor physical exercise

    Dear sir

    The author commented on the paucity of research on the point where physical exercise in polluted air becomes more harmful than beneficial. I would like to share our research findings conducted more than 10 years ago in Hong Kong (Yu et al, 2004). We compared the physical fitness of school children who regularly performed physical exercise with those who did not. In a less polluted district (annual mean P...

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    Conflict of Interest:
    None declared.