India, Dec. 27 -- New Delhi

Twenty-eight goods-carrier buses were impounded, over 2,500 vehicles were penalised for violating pollution-under-control (PUC) certificate norms and 28 PUC centres were suspended between Thursday and Friday, as Delhi agencies tightened the enforcement of the Graded Response Action Plan (Grap) to curb pollution.

Besides, 100 buses have been impounded this month for pollution-related violations, officials said.

Transport minister Pankaj Kumar Singh said senior officials have been directed to personally inspect PUC centres across Delhi to ensure that vehicle owners do not face inconvenience while obtaining certificates. "We are enforcing pollution norms firmly while ensuring that vehicle owners face no difficu...