The Regional Transport Authority (RTA) here today sealed four pollution checking centres in the district as they were allegedly found issuing certificates without examining the vehicles.
Notices were also issued to some other centres for having committed irregularities in checking of pollution of vehicles, a spokesman of the authority said.
The drive to check such centres was launched after a news channel made a sting operation in this regard, he said.
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Action is being taken against it, he added.
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