write a speech on the topic ,"a pollution free diwali".

Such questions need to be attempted on your own to test your creative writing skills. However, these points might help you elaborate:
 
 - Diwali is a festival of lights, celebrated to mark the return of Lord Rama to Ayodhya after 14 years of exile.

- Diwali signifies the victory of good over evil as Lord Rama had defeated Ravana before returning to Ayodhya.

- People light earthen oil-lamps, put electrical lights on the buildings, burst crackers on this day.

- To truly signify the victory of all that is good, let us pledge to celebrate a pollution free Diwali.

- Instead of using electrical lights for pomp and show, let us use only earthen diyas to light our houses on Diwali.

- Crackers give out extremely harmful fumes that cause air pollution and lead to respiratory problems, irritation of the eyes and skin.

- Instead, we can share sweets with the less fortunate on this day and spread goodwill and cheer.

- Goddess Lakshmi is worshipped to bring prosperity in the household and business. Share your good fortune with the domestic help, street children, rag-pickers.

- In place of bursting loud and noisy crackers, we can just eat sweets and exchange gifts with relatives and friends.