How are Air Toxics from Motor Vehicles Formed?
How are Air Toxics from Motor Vehicles Formed?
Some toxic compounds are present in gasoline and are emitted to the air
when gasoline evaporates or passes through the engine as unburned fuel.
Benzene, for example, is a component of gasoline. Cars emit small
quantities of benzene in unburned fuel, or as vapor when gasoline evaporates.
A significant amount of automotive benzene comes from the incomplete
combustion of compounds in gasoline such as toluene and xylene that are
chemically very similar to benzene. Like benzene itself, these compounds
occur naturally in petroleum and become more concentrated when petroleum
is refined to produce high octane gasoline.
Formaldehyde, acetaldehyde, diesel particulate matter, and 1,3-butadiene are
not present in fuel but are by-products of incomplete combustion.
Formaldehyde and acetaldehyde are also formed through a secondary process
when other mobile source pollutants undergo chemical reactions in the
atmosphere.
Some toxic compounds are present in gasoline and are emitted to the air
when gasoline evaporates or passes through the engine as unburned fuel.
Benzene, for example, is a component of gasoline. Cars emit small
quantities of benzene in unburned fuel, or as vapor when gasoline evaporates.
A significant amount of automotive benzene comes from the incomplete
combustion of compounds in gasoline such as toluene and xylene that are
chemically very similar to benzene. Like benzene itself, these compounds
occur naturally in petroleum and become more concentrated when petroleum
is refined to produce high octane gasoline.
Formaldehyde, acetaldehyde, diesel particulate matter, and 1,3-butadiene are
not present in fuel but are by-products of incomplete combustion.
Formaldehyde and acetaldehyde are also formed through a secondary process
when other mobile source pollutants undergo chemical reactions in the
atmosphere.
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