The ministry told a bench comprising Justices Madan B Lokur and Deepak Gupta that in cement manufacturing units, use of pet coke was "miniscule" and for non-fuel purposes, while the use of furnace oil in electricity generation plants was also very low.
The Centre had earlier informed the top court that the Central Pollution Control Board (CPCB) had issued a direction prohibiting the use of pet coke and furnace oil until further orders in the states of Uttar Pradesh, Rajasthan and Haryana.
The bench asked the ministry to file an affidavit in this regard and posted the matter for hearing next week.
The apex court had on November 22 refused to modify the Centre's notification banning use of furnace oil and pet coke in Uttar Pradesh, Rajasthan and Haryana and asked the NTPC, which was seeking relaxation till it switched over to alternative fuel, to approach the government.
The court was hearing a PIL filed in 1985 by environmentalist M C Mehta who had raised the issue of air pollution in the Delhi-NCR.
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