The Ministry of Road Transport and Highways (MoRTH) told a bench comprising Justices Madan B Lokur and Deepak Gupta that EPCA has given certain recommendations in its report and has said that these issues were agreed upon by the stake holders, including the ministry.
However, the ministry said it has not given its consent to the report.
"I need some time to respond to the report. We are not agreed but yet it is written in the report that we have agreed," Solicitor General Ranjit Kumar, appearing for the ministry, told the bench.
The ministry also said they have complied with the directions given on August 10 by the apex court when it had issued a slew of directions including non-renewal of insurance policy of vehicles unless the owner provides PUC certificate to the insurance firms.
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It had asked the ministry to ensure within four weeks that all fuel refilling centres in NCR have a functional PUC centre.
In its fresh report, the EPCA has favoured review and upgradation of the PUC norms for pre-BS IV vehicles and also to upgrade test procedure for smoke density of commercial vehicles.
In its 28-page report, the panel said it had analysed the PUC test results for different categories of vehicles in Delhi and NCR submitted by the transport departments in NCR.
"One critical observation was the very poor failure rate of vehicles at the PUC centres -- on an average not more than 2 per cent were found to fail the tests. While corruption and poor testing procedures contribute towards poor failure rate, analysis also shows a very wide margin of difference between the test results and the limit values for large majority of vehicles," the report said.
OBD is an automotive term referring to a vehicle's self- diagnostic and reporting capability. OBD-II is an improvement over OBD-I in both capability and standardisation.
"MoRTH has already directed transport departments to ensure that the centres must check if the malfunction light (MIL) is on (red), then the vehicle should be sent back to the manufacturer for detailed check and repair at the workshop.
The panel has also sought to specify that there was a clear protocol to monitor emissions on roads in real world conditions with the use of portable devices and this would be done for both light duty and heavy duty BS-VI vehicles.
Favouring tighter norms and test procedures for diesel vehicles, the EPCA said that under the current PUC regime only smoke density test is possible in diesel vehicles and no other pollutant can be monitored.
"Visible smoke test is inappropriate as visible smoke does not have direct correlation with particulate matter emissions. In fact, invisible emissions from diesel vehicles can have higher tiny particles," it said.
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