Ugh, I Can't Wait to Get to Fresher Air
Why men who run and cycle outdoors may be speeding toward an early grave. (What's up with the sexist title? A couple of the studies the article cites were on men, but the rest weren't.) From the link:
Research conducted in Finland shows an even clearer connection between dirty air and heart-attack risk. Every 2 weeks over a 6-month period, scientists monitored 45 volunteers as they exercised in simulated dirty-air conditions. Results linked both fine-particle pollution (the effluvia issuing out of smokestacks) and ultrafine-particle pollution (the invisible emissions from motor vehicles) with a threefold increase in the risk of ischemia, a potentially lethal shortage of oxygen reaching the heart muscle.