The automobile (cars and trucks) is a large source of air pollution in the Phoenix metropolitan area.

Fast Facts

• A majority (64.3 percent) of the carbon monoxide in the Valley’s air comes from cars and trucks.
• About a third (32.9 percent) of the particulate matter in the air comes from automobiles. 
• Most particulates (43 percent) come from construction-related activity, while 22.6 percent comes from agriculture and vacant lots. 
• A small portion (1.5 percent) comes from point sources like power plants.