5-Control Measures Of Air Pollution:

        a-Changing fuels and selecting those which are less harmful. Natural gas, for example causes less pollution than petroleum.

         b-Removal of pollutants which result from fuel before they contaminate the air, e.g. by fixing filters for smoke coming out of chimneys and for exhaust pipes of motor cars.

         c-Using solar energy which is a clean type of energy with no pollutants, and applying strict precautions for the control of radiation.

         d-Construction of factories and laboratories out of towns and cities and taking all the necessary sanitary precautions.