Why Do Cities in Warm and Dry Climates Tend to Have

Multiple Choice

Why do cities in warm and dry climates tend to have more air pollution?​

A) ​There are more automobiles in these areas.
B) ​These locations are usually surrounded by mountains that trap the air pollution.
C) ​There are more plants and trees that promote the formation of VOCs.
D) ​There are more chemical reactions that can happen in dry climates.
E) ​There are no natural pollution reduction factors such as precipitation and salty sea spray.