People shop for green firecrackers ahead of Diwali festival in New Delhi.

A boy buys green firecrackers ahead of Diwali festival in New Delhi.

A set of newly unveiled 'green crackers', developed by CSRI, at Anusandhan Bhawan in New Delhi.

Minister for Science and Technology Harsh Vardhan launches a set of 'green crackers', at Anusandhan Bhawan in New Delhi.

A shopkeeper arranges locally manufactured green fire-crackers to sell for Diwali festival, in Barpeta district, Assam.