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The purpose of the emission control system is just that; it controls
the emissions and exhaust from your vehicle. The idea is to turn the
harmful gases your car manufactures into harmless ones that don't
ruin the environment, or us. Some of the problem gases are:
hydrocarbons (unburned)
carbon monoxide
carbon dioxide
nitrogen oxides
sulfur dioxide
phosphorus
lead and other metals
To help control these substances, we (along with federal regulations)
have made changes in our gasoline to eliminate them. Also, with a
push from federal regulations, we have developed ways, varying from
state to state, to test emissions, that have caused automotive
manufacturers to develop better, safer emission systems.
Although emissions control systems vary between manufacturers and
vehicles, they all have the same goal and use many of the same
methods. The addition of computers to ignition systems allows the
engine to monitor and adjust itself continuously, so it just isn't
true that emission controls lower the amount of mileage we get from
fuel.
The best news is that emission controls have reduced carbon monoxide
and hydrocarbon emissions by about ninety-six percent from
pre-control vehicles. That's almost a hundred percent!
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