City cycling may save the planet, but not your lungs: study

Urban cycling, while good for the environment, may pose a risk your health, a new Dublin study has found. Cycling in congested cities could do more harm than good to your heart and lungs, due to the breathing in of dangerous pollutants in the air, the study found. The study, led by Marguerite Nyhan of Trinity College, recruited 32 fit, healthy cyclers who opted for mostly traffic-free routes.

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