The association said it uses the most recent data collected by the U.S. Environmental Protection Agency for the “two most widespread types of pollution ... s list of the U.S. cities ...

"Both these types of pollution cause people to die. They shorten life expectancy and drive increases in asthma rates," says Mary Rice, a pulmonologist at Harvard University. Pollution levels vary ...

Noise pollution is one of the types of pollution we don't often think ... places in the U.S. Not surprisingly, cities top the list. They have background levels between 55 - 67 decibels.