Study: Exposure To Polluted Air Is Equivalent To Smoking A Pack A Day

(CNN) — Long-term exposure to air pollution, especially ground-level ozone, is like smoking about a pack of cigarettes a day for many years, a new study says, and like smoking, it can lead to emphysema.
The study, published Tuesday in the medical journal JAMA, is the largest of its kind. It looked at exposure to air pollution — specifically to ground-level ozone, fine particulate matter, nitrogen oxide and black carbon. The study looked at more than 7,000 adults ages 45 to 84 for ove