The air quality in the National Capital Region has reached hazardous levels with data from the System of Air Quality and Weather Forecasting And Research (SAFAR) showing the Air Quality Index (AQI) in the ‘severe’ category. As we know, air pollution is linked to a number of health risks, including cancer, premature death and heart problems. In an earlier interaction with indianexpress.com, Dr M S Kanwar, Senior Consultant, Department of…