Pollution due to cars

Automobiles and cars are the most important factors which causes environmental pollution. We car owners are also accountable for the air pollution and the depletion of ozone layer in atmosphere. I accept that the stopping use of cars is not a possible solution but we can contribute to the environment by using the cycles for small distances. Use the bio fuels which cause less pollution to the environment. Also most important is maintaining the car which can reduce the exhaust amount from it.