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. 2015 Jun 1;123(6):A158. doi: 10.1289/ehp.123-A158

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graphic file with name ehp.123-A158.g001.jpg — Some studies have documented short-term impacts of exercising in polluted areas, such as reduced lung function in cyclists. Over the long term, however, the beneficial effects of exercise appear to win out.

© Ulrik Jantzen/Bloomberg via Getty Images