Grap-4 Returns As Delhi AQI Crosses 400

Air Quality Status  
On January 17, 2026, Delhi’s AQI surged from 400 in the afternoon to 428 by evening, driven by unfavorable weather conditions and poor pollutant dispersion. The city entered the severe category, posing serious health risks, especially for vulnerable groups.  

Government Measures  
The Commission for Air Quality Management (CAQM) responded by reactivating GRAP-4, the strictest set of emergency measures. These curbs aim to control emissions and safeguard public health as the city battles hazardous smog.  

Key Highlights  

• AQI rose sharply to 428, entering the severe category  
• Stage IV restrictions under GRAP reimposed across Delhi-NCR  
• Construction and demolition activities banned until further notice  
• Entry of diesel trucks and BS-III petrol, BS-IV diesel vehicles restricted  
• Work-from-home advisories issued for government and private offices  
• Schools urged to limit outdoor activities for children  
• Weather conditions including fog and western disturbances worsened pollution levels  

Impact And Reflection  
The return of GRAP-4 underscores the recurring challenge of winter pollution in Delhi. While emergency measures provide temporary relief, experts stress the need for long-term solutions such as cleaner fuels, stricter industrial norms, and sustainable urban planning to break the cycle of severe air quality episodes.  

Sources: Hindustan Times, Economic Times, ABP Live