Air Pollution

PUC Certificate must to buy fuel in New Delhi


From UPSC perspective, the following things are important :

Prelims level : PUC Certification

Mains level : Delhi Air Pollution issue

Motorists will not be able to buy fuel in Delhi without a valid Pollution Under Control (PUC) certificate from October 25.

What is PUC Certificate?

  • The PUC certificate is a document that any person driving a motor vehicle can be asked to produce by a police officer in uniform authorized by the state government.
  • These issue certificates if a vehicle is found complying with the prescribed emission norms.
  • Since the Motor Vehicles (Amendment) Act, 2019 came into force, PUC certificate has been made mandatory.
  • A PUC certificate contains information such as the vehicle’s license plate number, PUC test reading, date on which the PUC test was conducted and the expiry date.

Compliance rules

  • According to Central Motor Vehicles Rules, 1989, every motor vehicle is required to carry a valid PUC Certificate after the expiry of period of one year from the date of its first registration.
  • This includes those conforming to BS-I/ BS-II/ BS-III/BS-IV /BS-VI as well as vehicles plying on CNG/LPG.
  • However, the validity of four-wheeled BS-IV compliant vehicles is one year and for other vehicles it is three months.

How is a pollution control check carried out?

  • The computerized model for pollution check was developed by the Society of Indian Automobile manufacturers.
  • A gas analyzer is connected to a computer, to which a camera and a printer are attached.
  • The gas analyzer records the emission value and sends it to the computer directly, while the camera captures the license plate of the vehicle.
  • Subsequently, a certificate may be issued if the emission values are within the limits.

Why obtain PUC Certificate?

  • Emissions from automobiles are major contributors to air pollution all over the world.
  • The smoke emitted from vehicles contains the following pollutants:
  1. Hydrocarbons (HC)
  2. Carbon Monoxide (CO)
  3. Oxides of Nitrogen (NOx)
  4. Particulate Matter (PM)
  5. Sulphur Dioxide (SO2)
  6. Carbon Dioxide (CO2)
  7. Nitrous Oxide (N2O)


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