The Supreme Court yesterday said that air pollution cannot become a political battle, stressing that the choking air quality is responsible for the "murder of people's health". As we continue to live and breathe in this 'severe' air, we ask what is PM 2.5, why is it a killer, why are children most vulnerable, and if masks and purifiers work. Dr Arvind Kumar, chest surgeon and an expert in this field, answers questions on how to prepare and protect ourselves.
