Delhi’s overall Air Quality Index (AQI) clocked 410 today as per the 4PM AQI Bulletin provided by the Central Pollution Control Board (CPCB). In view of this sudden spike in the overall AQI of Delhi, the Sub-Committee for invoking actions under the Graded Response Action Plan (GRAP) of the Commission for Air Quality Management in NCR & Adjoining Areas (CAQM) held an emergency meeting today.