How to Reduce Cyclists' Exposure to Air Pollution

We’ve known for years that cycling, for all its health benefits, has a dark side: Bikers inhale more black carbon than pedestrians do. Some studies have suggested that cyclists can reduce their exposure to air pollution by taking alternative routes. But a recent study of commuting in Fort Collins complicates that recommendation.

Researchers at Colorado State University followed 45 bicycle and car commuters in Fort Collins and measured their exposure to multiple hazardous air pollutants: black carbon, carbon monoxide, and particulate matter. Compared to drivers, cyclists tended to have higher mean exposure to particulate matter but lower mean exposure to carbon monoxide. They were also able to reduce their mean exposure to black carbon and carbon monoxide by using alternate routes (pictured in the figure below).