Sources of emission
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Emissions from a fuel-driven motor vehicle usually come from 4 sources: the fuel tank, the carburetor, the crankcase, and the exhaust system.
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Combustion
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To reduce exhaust emissions, some devices or systems control the combustion process itself, while others treat the resulting exhaust gases. Most modern vehicles use a combination.
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Combustion chamber design
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Combustion chamber design can affect the combustion process, and the level of emissions. Designs that increase gas flow rate and promote vaporisation, distribute fuel more evenly in the chamber.
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