The green tribunal on May 5 had directed to limit the entry of diesel and petrol tourist vehicles to the 13,050 feet Rohtang Pass till August 14 to 1,000 per day.
The NGT bench headed by judicial member U D Salvi said that state government has to file an exhaustive reply on every aspect raised by taxi and luxury coach operators and say how it proposed to address the problem.
"Our only approach is to protect the environment. We have taken measured steps to the problem. We can discipline ourselves but we can't discipline nature," it said while posting the hearing for tomorrow.
Senior advocate Vibha Dutt Makhija, appearing for taxi and luxury coach operators, said the Supreme Court has directed them to approach the green tribunal for redressal of their grievances.
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"We are totally non-polluting vehicles in the eyes of law and are complying with all the conditions, but the environment compensation tax imposed on the vehicles as per the directions of the tribunal is arbitrary and discriminatory," she said.
"People are sitting on dharna outside the Deputy Commissioner's office, regular strikes of taxi operators are taking place in the area and tourists coming to Manali are fleeing the state," he said.
He said Himachal Pradesh has undertaken several steps for environment protection including complete polythene ban and removal of 150 local dhabas from Manali-Rohtang areas. "We are supporting the taxi operators on certain conditions as situation on the ground is quite different," he added.