Vehicular population is increasing day by day and smoke emission from Automobiles is causing pollution and also becoming hazardous to health. 421 pollution checking centres are functioning in the State of Punjab to check the emission of vehicles and to issue pollution under control certificates to motor vehicles of all types, so as to keep the environment free of pollutants realised by diesel and petrol operated vehicles
As provided under sub rule (7) of Rule 115 of Central Motor Vehicles Rules, 1989, after the expiry of a period of one year from the date on which the motor vehicle was first registered, every motor vehicle is required to carry a "Pollution Under Control Certificate" issued by an agency authorized for the purpose by the Government. Such certificate, valid for six months, shall always be carried in the motor vehicle and is required to be produced on demand by the checking officers referred to in sub-rule (1) or Rule 116 of the Rules ibid. The Certificate issued under sub rule (7) of rule 115 shall, while it remains effective, be valid through out India.