Get access to everything we publish when you sign up for Outside+.
What’s Happening On City Runs
Not optimal news for urban runners: Exposure to pollution has serious effects on skin long-term. A study published in the Journal of Investigative Dermatology found that nitrogen dioxide (commonly found in auto emissions) leads to an increase in liver spots, while other research has linked this to a decrease in collagen and elastin.
If you are a city runner, consider opting for a park or trails, far removed from cars. Dermatologists note that anyone can offset this issue by removing makeup (which can harbor pollutants) every night and exfoliating regularly.