The official, on condition of anonymity, said a model other than the current approach of giving subsidies to farmers for stubble management machines and incentives for not burning crop residue may need to be considered.
Hundreds of advocates marched on the streets near the Saket court, raising "We want justice" slogan and holding placards. Traffic was blocked and diverted for half an hour while they marched on the road.
A student was quoted as saying in the letter, "At this point we need a strong directive from the government of India and the governments of the states affected to control this serious condition. We do have belief in our beloved Prime Minister who will surely take strong decision on this."
Other sources of air pollution include brick kilns, crop residue burning and unregulated construction activity, Justice Kumar said, adding that for 70% of the time in a day, Delhi’s roads are “bumper-to-bumper”.
In a statement released Wednesday, he appealed to the Opposition parties not to oppose the scheme, which aims to reduce pollution by allowing only half of privately owned cars on the roads on any given day.