The New Indian Express. A thick blanket of smog engulfed large parts of north India on Monday, a day after Diwali celebrations, with air quality deteriorating sharply across Delhi, Haryana, Punjab and western Uttar. 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.