Automobile
Emission Control
Automobile emission control is a reduction of the air pollution
caused by automobiles by modification of the fuel and careful
design. The principal pollutants are unburnt hydrocarbons,
carbon monoxide, nitrogen oxides, and lead halide particles.
The last can be eliminated if alternatives to antiknock additives
in the gasoline are used but the others require redesigned
cylinder heads, recycling and afterburning of exhaust gases,
and better metering of the gasoline supply through fuel injection.
Another approach is the development of alternatives to the
conventional internal combustion engine, including battery-
and fuel-cell-powered vehicles, gas turbine, solar, and even
steam-powered units.
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