Nepal's government banned the use of plastic in its capital city, Kathmandu, this week to mark the Nepali New Year.

The move aims to address the growing problem of plastic and polystyrene waste in the burgeoning city.  Though there are no official estimates, campaign groups claim the city uses 5 million plastic bags every day.

Businesses and manufacturers were quick to oppose the move. Nepal's Plastic Manufacturers Association condemned the decision.This is an adhoc decision and we are not going to shut down our factories or our workers will lose jobs. We challenge the government to close our factories it if it has power to do so, said Sharad Sharma, president of the association.

Earlier this week, Nepal's Supreme Court rejected an appeal from the plastic association to halt the ban.

Government officials point out that only plastic bags thinner than 40 microns—mostly used for disposable shopping bags —have been banned.

Other countries have similar bans so there is no need to make a hullaballoo, said Mahendra Bahadur Gurung, joint secretary at the Environment Ministry. The government will strictly monitor and assure its implementation, he said.

But even some lawmakers doubt the ban can be achieved.It's easy to take decisions however its implementation is not easy, said Rabindra Adhikari, president of the Parliamentary Committee on Development.

Kathmandu banned the use of plastics two year ago, but withdrew its decision within less than a month due to pressure from plastic manufacturing companies.

In 2011, the Ministry of Environment  imposed fines of Rs 500-50,000($5-500) on manufacturers producing bags thinner than 20 microns, which many people say hasn't been implemented.

Others have welcomed the decision. Bharat Basnet, owner of Kantipur Temple, a plastic-free hotel in Kathmandu, has been an advocate for the ban. There are alternatives to plastic, the only thing we need is commitment, he said.

Environmental activism is gaining momentum in the city suffering from severe Pollution and  poor waste management systems.