NEW DELHI: The National Green Tribunal warned of halting state transport in four northern states if they did not introduce CNG, saying most particulate matters in the air inhaled by Delhi residents emanated from there. “What have you done with regard to introduction of CNG stations in your areas? What are you doing about this? We had asked you to submit your response on the issue. What have you done on this?” a bench headed by NGT chairperson justice Swatanter Kumar said.

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