Two methods of preventing the pollution associated with motor vehicle emissions would be to improve fuel efficiency and to modify the internal combustion engine to reduce emissions.

Motor Vehicle Emissions

The gases and particles released into the atmosphere as a result of the combustion of fuels in motor vehicles, contributing to air pollution and environmental harm.

Internal Combustion Engine

An engine in which the combustion of a fuel (normally fossil fuels) occurs with an oxidizer (usually air) in a combustion chamber.

Fuel Efficiency

A measure of how effectively a vehicle uses fuel, typically expressed in miles per gallon (mpg) or kilometers per liter (km/L).