How does pollution occur due to vehicles? Give the names of vehicles causing least pollution.
Most of the vehicles are run on fossil fuels like petrol and diesel. These fossil fuels are burnt in vehicles to produce energy which results in the production of smoke. This smoke contains harmful gases like carbon monoxide, hydrogen, nitrogen oxide, particulate matter, ammonia and sulphur dioxide.
There are various other kinds of vehicles which cause least or no pollution at all, for example. bicycle, vehicles run on CNG, electric cars, metro etc.