The air pollution accumulating in the interior of automobiles consists almost exclusively of gaso- line and diesel exhaust. This toxic soup of gases, aerosols, and microscopic particles includes ben- zene (a known carcinogen), carbon monoxide (which interferes with the blood s ability to trans- port oxygen), particulate matter (which studies have associated with increased death rates), and a host of other hazardous chemicals. Public health officials frequently issue warn- ings reported in local weather broadcasts when con- centrations of auto pollutants exceed healthful lev- els in the ambient air. The air quality inside of cars is typically much.
