A bench headed by NGT Chairperson Justice Swatanter Kumar asked the city government to expeditiously take such vehicles off the roads.
"It is pointed out that large number of diesel taxis are being permitted to ply in the NCT of Delhi contrary to the judgement and directions of the Supreme Court.
"We direct the state government to look into this aspect and particularly the diesel vehicles which are more than 10 years old must be taken off the road and seized without any further wasting of time," the bench said.
The NGT had earlier expressed concern over the high pollution level in Delhi-NCR, terming it an "environmental and health emergency" and saying that the city should "not gift infected lungs to its children."
The tribunal was hearing a plea on the worsening air quality in the national capital.
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