Air Pollution Officially Causes Cancer
So much for urban bike commuters

Heading out the door? Read this article on the new Outside+ app available now on iOS devices for members! Download the app.
On Thursday, the World Health Organization officially added air pollution to the list of leading causes of cancer worldwide.
“We consider [air pollution] to be the most important environmental carcinogen, more so than passive smoking,” said Kurt Straif, head of the International Agency for Research on Cancer department that detects cancer-causing substances.
Unfortunately, the agency had few recommendations for how we should indiviually deal with the new classification. “When I walk on a street where there’s heavy pollution from diesel exhaust,” Straif told NBC News, “I try to go a bit further away. So that’s something you can do.”