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exhaust gas(8)
gas emissions(8)
gasoline(8)
natural gas(8)
natural gas vehicles(8)
priority journal(8)
article(6)
combustion(6)
compressed natural gas(6)
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diesel engines(6)
liquefied natural gas(6)
liquefied petroleum gas(6)
acetaldehyde(4)
air pollution(4)
air quality(4)
alkane(4)
alternative fuel(4)
alternative fuels(4)
carbon dioxide(4)
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