Delhi and the National Capital Region saw severe air quality deterioration after Diwali, with AQI exceeding 400 at several locations. Factors included firecrackers, local emissions, and weather conditions. Political parties exchanged blame over the causes, including regional stubble-burning in Punjab. Delhi pollution after Diwali worsens as thick smog blankets the capital. AQI stands at 366, while 15 monitoring stations record severe air quality. GRAP Stage III restrictions remain in force.