In a move to curb air pollution, the environment ministry has, in a notification, said that import of pet coke for trading will not be permitted in NCR states. In the notification dated January 19, the ministry has put a host of restrictions on sale and use of pet coke in lime kilns in NCR, to control and abate environmental pollution. Pet coke is one of the key sources of air pollution in the region. The notification stated that no lime kiln using pet coke as fuel will operate in NCR without obtaining the consent and registration of the state pollution control boards concerned. The consent issued will have to clearly specify the quantity of fuel permitted per month and per annum, it said. Also, industrial units will not be permitted to store pet coke for more than its three months consumption.