Delhi's AQI Crosses 400: GRAP-4 Implemented Amid 'Severe+' Air Quality

• Delhi-NCR faces 'Severe+' air quality as AQI rapidly rises to nearly 450, prompting strict restrictions.
• The Commission for Air Quality Management (CAQM) implemented GRAP-4 after Delhi's AQI hit 400 at 4 PM and 428 by 8 PM on Saturday.
• Adverse weather, a Western Disturbance, and poor pollutant dispersion are cited as primary reasons for the sharp deterioration.
• GRAP-4 imposes the strictest measures, including a ban on construction activities, to curb pollution.
• Existing GRAP Stages 1, 2, and 3 restrictions remain in effect, with GRAP-4 added as a precautionary measure.

Why It Matters: Delhi-NCR implements GRAP-4 due to 'Severe+' air quality, banning construction and urging caution.