A bench headed NGT Chairperson Justice Swatanter Kumar also directed the city government to submit the exact number of diesel vehicles plying in the capital and their impact on air quality by April 7, the next date of hearing.
"Presence of pollutants in ambient air is a matter of serious concern for all stakeholders. Human health is right to life and must take precedence over commercial and other infrastructural projects.
The tribunal said it was "pained" to note that despite its repeated persuasive and mandatory orders, the authorities have not risen to take effective steps.
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"The response of authorities is lacking will, bona fide and shifting of responsibilities from one department to another and finding faults with different departments has been the defence before us," it said.
During the hearing, Delhi Transport Corporation (DTC) told the bench that a team comprising of Central Pollution Control Board and Delhi Pollution Control Committee had inspected 15 old and 12 new low floor buses of DTC that are plying on the roads of Delhi.
"Out of these, 12 new buses were found to be compliant with the prescribed emissions norms while out of 15 old vehicles 9 were found compliant and six were found to be non-confirming to the prescribed standards," the corporation said.