For those living in the national capital and other big cities, the day after Diwali has been a breathless one. According to the Centre for Science and Environment, in Delhi, Diwali pollution has not just worsened this year, but is also more toxic. Figures show that the deadly PM 2.5, which are tiny particles that penetrate the lungs, were nearly 40 times above the safe level. Low wind speeds have added to the problem. This is a public health emergency, but are we serious about tackling pollution?