A bench headed by NGT Chairperson Justice Swatanter Kumar directed the AAP government, three municipal corporations and the Delhi Pollution Control Committee to sit together and select at least one market to implement the ban.
"Please tell us one market where you have banned plastic. All the figures you are giving are very good, but the authorities must implement it strictly. All of you decide at least one market and make it plastic free," the bench said.
The green panel had earlier asked city government to strictly impose a fine of Rs 5,000 on those violating the plastic ban order and carry out raids on shops or vendors possessing plastic bags.
It had also asked the AAP government to submit a status report on the steps taken to implement its order banning plastic in the national capital.
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The green panel had last year banned the use of disposable plastic in Delhi and NCR with effect from January 1 this year.
The NGT had prohibited the use of disposable plastic in the entire city, especially at hotels, restaurants, public and private functions, while asking the Delhi government to take appropriate steps against "storage, sale and use" of such material from January 1.
It had also said that an environment compensation of Rs 10,000 would be imposed on vegetable vendors and slaughter houses for throwing garbage in public places.