How can aerial pollution by colloidal particles of smoke be prevented ? Explain.

Explanation

Aerial pollution by colloidal particles of smoke be prevented by electrical precipitation oi smoke. Smoke is a colloidal solution of solid particles such as carbon, arsenic compounds, dust, etc., in air. The smoke, before it comes out from the chimney, is led through a precipitator containing plates having a charge opposite to that carried by smoke particles. The particles on coming in contact with these plates lose their charge and get precipitated. The particles thus settle down on the floor of the chamber. The precipitator is called cottrell precipitator.