What can be reduced by using exhaust gas recirculation (EGR) effectively?

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Automobile Engineering Practice Test: Engine Emissions — practice the complete quiz, review flashcards, or try a random question.

Engine emissions are exhaust gases that are released from an engine after fuel combustion. They can be particulate or gaseous and include carbon dioxide (CO2), water vapor, and other compounds.  Engine emissions can include: Particulate matter (PM): A mixture of soot and other solid and liquid materials, such as heavy hydrocarbons. Nitrogen oxides (NOx): A primary ingredient in smog that forms when nitrogen is released during combustion and combines with oxygen. Carbon monoxide: A toxic compound that can affect the bloodstream and cause complications for people with heart... Show more

What can be reduced by using exhaust gas recirculation (EGR) effectively?