Public awareness regarding pollution really took off in the
70's. As a result, new methods were developed to curb the
pollution problems. One major contributor to air pollution was
automobile exhaust. Pollutants such as carbon monoxide, hydro
carbons and oxides of nitrogen were a problem automakers were
forced to deal with. Development of emission control systems was
under way. Today, the main pollution control devices are the
catalytic converter, the E.G.R. or Exhaust Gas Recirculation,
the air injection system and the positive crankcase ventilation
system. These systems use one of two methods of emission
control. They either convert the harmful emissions into safer
gases like carbon dioxide or water vapor or they restrict
pollutants from forming altogether. ©2006 Crossroads Mobile. All
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