Delhi AQI Hits 'Severe' 428: GRAP-4 Implemented, What Closes Now?

• Delhi's Air Quality Index (AQI) crossed 400 on Saturday evening, reaching 428 by 8 PM, categorizing the air as 'severe'.
• The Commission for Air Quality Management (CAQM) immediately implemented GRAP-4 (Graded Response Action Plan - Stage 4) due to the deteriorating air quality.
• GRAP-4 imposes strict restrictions including a complete ban on non-essential truck entry into Delhi and a prohibition on diesel-powered medium and heavy goods vehicles registered in Delhi (excluding BS-VI and essential services).
• All construction activities, including public projects like highways and flyovers, are now halted under GRAP-4.
• Potential measures include government and private offices operating at 50% capacity with 'work from home' and closure of physical classes in schools for certain grades.

Why It Matters: Delhi faces severe air pollution, leading to immediate GRAP-4 implementation with strict bans on vehicles and construction.