i heard there is a 6 months grace for a new car.
edit : i was wrong
Central Motor Vehicle Rules, 1989
Emission of smoke, vapour, etc., from motor vehicles
115. Emission of smoke, vapour, etc. from motor vehicles.
[(7) After the expiry of a period of one year from the date on which the motor vehicle
was first registered, every such vehicle shall carry a valid "Pollution under control"
certificate issued by an agency authorised for this purpose by the State Government.
The validity of the certificate shall be for 266[six months] and the certificate shall always
be carried in the vehicle and produced on demand by the officers referred to in sub-rule
(1) of rule 116.
(8) The certificate issued under sub-rule (7) shall, while it remains effective, be valid
throughout India.]