Business Delhi air pollution: As Diwali season kicks in, should the capital be worried? Updated : October 26, 2018 03:26 PM IST The recent trend in the past week shows that New Delhi is unlikely to breathe easy on the Diwali day. In 2016, Diwali in the capital was nothing but a blanket of smog. In 2017, the capital relatively breathed its best on Diwali day as the air quality index was 319. Subscribe to Moneycontrol PRO at just Rs.33/- per month for the first year. Use code SUPERPRO. Limited period offer. Available on Web and Android.