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High Quality Content by WIKIPEDIA articles! Vehicle emissions control is the study and practice of reducing the polluting emissions produced by vehicles powered by internal combustion engines.Motor vehicles produce many different pollutants. The principal pollutants of concern those that have been demonstrated to have significant effects on human, animal, plant, and environmental health and welfare. Hydrocarbons: this class is made up of unburned or partially burned fuel, and is a major contributor to urban smog, as well as being toxic. They can cause liver damage and even cancer. The regulations regarding hydrocarbons vary according to the engine regulated, as well as the jurisdiction.