Related articles:
Acid rain
Catalytic converter
Automobile
Nitrogen oxide
Fuel injection
Vehicle inspection
Key terms:
air
emissions
fuel
engine
burn
exhaust
gas
agency
vehicles
cars
reduce
regulations
standards
pollution
hydrocarbons
pcv
smog
meet
united states
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environmental
valve
ignition
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unburned
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oxygen
oxides
crankcase
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methane
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air injection
carbon monoxide
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state of california
hydrocarbon standard
california air resources board
united states environmental protection agency
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