According to Environmental Defense Fund of United States, automobile emissions account for more than 20 percent of U.S. global warming emissions each year. Automobiles undermine our environment by adding several obnoxious chemicals during their life cycle. However, major environmental damage is caused by pollutants emitted through automobile tailpipes during driving.
Automobiles exhausts contain several hazardous pollutants and have a profound impact on the air we breathe in and ultimately on human health. Although such pollutants are also spewed at power plants, refineries and other industrial units, car emissions are significantly dangerous as they have a direct exposure to the people.
Pollutants in Car Emissions
Almost all cars use internal combustion engines for power generation. In an internal combustion engine, fuel (Generally, gasoline or diesel) is burnt in an enclosed cylinder and the resulting explosion is used to drive a piston in a certain manner. Like all physical processes, fuel combustion in an internal combustion engine is imperfect. As a result, some part of the fuel remains unburnt or is incompletely burnt.
