Delhi Air Pollution: In view of the worsening air quality levels and to prevent further environmental degradation, the Commission for Air Quality Management (CAQM) Sub-Committee has implemented Graded Response Action Plan (GRAP) Stage IV with immediate effect in the entire Delhi-NCR. As per data available on the aqi.in platform, Delhi’s overall air quality deteriorated to an alarming 'hazardous' level, with the Air Quality Index (AQI) touching 650 at around 8:19 pm.