
Biking to work is usually seen as a healthy choice, but a new study shows that it may have a downside. City dwellers who cycle to work had higher levels of black carbon in their lungs.
Created by the combustion of fossil fuels, black carbon is present in car exhaust fumes. Pedestrians breathe in these miniscule particles of soot, but bikers inhale even more because they are closer to the fumes and take deeper breaths, according to the study.
Previous research has shown that black carbon is associated with a wide range of health effects, including reduced lung function and a higher risk of respiratory diseases and heart attacks.
Researchers from the University of London collected lung cell samples from 10 urban commuters - five who walked to work and five who cycled. All the participants were healthy nonsmokers between the ages of 18 and 40.










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