Delhi Traffic Police has issued around 550 challans, imposing a total fine of over Rs one crore, to BS III petrol and BS IV diesel vehicles on Friday on the first day of the ban on these vehicles under the Graded Response Action Plan (GRAP) III in the national capital,

Delhi has continued to choke under the 'severe' category of air pollution for the last few days. The restrictions under stage III of the GRAP were imposed on Friday by the Commission for Air Quality Management (CAQM).

Delhi's air quality worsened further on Saturday, with many areas in the "severe" category, even as authorities intensified their action by imposing penalties of around Rs 5