As of 6 am, Delhi's overall Air Quality Index (AQI) stood at 311 (very poor), while several monitoring stations recorded readings close to the 400 mark (severe). Chandni Chowk recorded the highest. 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.