Celebrating light (and sweets, and a thorough clean-out) sounds like an excellent idea, this year more than ever!
Firecrackers, I’m told, are every bit as important for Diwali celebrations as they are for Independence Day in America. Unfortunately, the smoke from all those crackers has become a serious pollution problem in cities like Delhi. Here’s a video from the Hindustan Times on one attempt at a solution. Another initiative: