Most of us prefer the smell of fresh cut grass to the belch of diesel fumes. But experts say dense urban environments really do have higher levels of air pollution than their less populated, suburban counterparts.
On the American Lung Association’s most polluted list in 2010: cities like Los Angeles and Phoenix, where researchers found high levels of ozone (smog) and particle (soot) pollution. As for the locales with the cleanest air? Try Bismark, N.D., and Cheyenne, Wyo.
Not surprisingly, Los Angeles received an F grade from researchers measuring pollution levels and associated risks, like asthma and other chronic lung ailments. But towns like Duluth, Minn., scored an easy A, no doubt letting residents breathe a little easier.