NEW DELHI: In order to control air pollution in Delhi-National Capital Region (NCR) during the winter, the Graded Response Action Plan (GRAP) will be implemented from October 1. The restrictive anti-air pollution measures will come into force in four different states if AQI touches 201.GRAP has four stages — stage I when AQI is ranging between 201 and 300, stage II when AQI is 301-400, stage III when...