Question

vehicles should be checked regularly for the amount of pollution they cause why?

Answer 1

How much air pollution comes from cars?


You see it every time that smoke billows from your car's exhaust pipe, so there's no denying that vehicles are major contributors to air pollution. Air pollution refers to the presence of foreign substances in the air that don’t belong there, or excessive amounts of certain impurities that wouldn't harm us otherwise. When cars burn gasoline, they emit pollutants. Gasoline fumes escape into the air even when we pump gasoline into our fuel tanks.

There are four major pollutants that come from cars:

A car emits carbon monoxidewhen the carbon in fuel doesn't burn completely.

A car's exhaust emits hydrocarbons, a toxic compound of hydrogen and carbon.

When fuel burns, nitrogen and oxygen react with each other and form nitrogen oxides (NOx).

Particulate matter -- small particles of foreign substances -- in the air contribute to atmospheric haze and can damage people’s lungs.