Emphysema estimates are for adults 18 and over who have been diagnosed within their lifetime, based on national rates (NHIS) applied to county population estimates (U.S. Census).

FORBES: In Depth: Worst Cities For Ozone Pollution - 11. Hanford-Corcoran, Calif.

Chronic bronchitis estimates are for adults 18 and over who had been diagnosed in 2007, based on national rates (NHIS) applied to county population estimates (U.S. Census).

FORBES: In Depth: Worst Cities For Ozone Pollution - 12. Las Vegas-Paradise-Pahrump, Nev.

Diabetes estimates are for adults 18 and over who have been diagnosed within their lifetime, based on national rates (NHIS) applied to county population estimates (U.S. Census).

FORBES: In Depth: Worst Cities For Year-Round Particle Pollution - 18. Indianapolis-Anderson-Columbus, Ind.