Delhi-NCR has implemented Stage III of the Graded Response Action Plan (GRAP) due to a significant rise in air pollution. The Air Quality Index (AQI) in the region surged from 362 on Monday to 425 on Tuesday morning, marking the first time this season that the AQI has entered the 'severe' category. Data from the Central Pollution Control Board (CPCB) revealed that 34 out of 39 monitoring stations reported severe AQI levels, with Bawana recording the highest at 462, followed by Wazirpur at 460 and both Mundka and Punjabi Bagh at 452.

In response to the deteriorating air quality, the Commission for Air Quality Management (CAQM) has mandated that schools up to Class 5 in Delhi-NCR shift to a hybrid learning model. This allows parents and students to choose between online and in-person classes, depending on their access to necessary technology. The CAQM has also indicated that state governments may consider closing educational institutions entirely.

Stage III measures include a complete ban on non-essential construction and demolition activities, as well as restrictions on the use of certain vehicles. Specifically, BS-III petrol and BS-IV diesel light motor vehicles are prohibited in Delhi and surrounding areas. Additionally, non-essential diesel-run vehicles and those registered outside Delhi are also banned unless they are transporting essential goods or services.

The CAQM noted that the rise in pollution levels is attributed to calm winds and stable atmospheric conditions, which have allowed pollutants to accumulate. The implementation of these measures aims to mitigate the impact of air pollution, which is exacerbated during the winter months due to various local sources, including vehicle emissions and agricultural burning. Public projects related to railways, metro construction, and healthcare will continue as planned despite the restrictions.