Instruction:
Give me a list of the seven most polluted cities in America

Response:
According to the American Lung Association, the 7 most polluted cities include 5 cities from California.  The list is order is, Los Angeles-Long Beach, Bakersfield, Visalia, Fresno-Madera-Hanford, Phoenix-Mesa, San Diego-Chula Vista-Carlsbad, and Denver-Aurora