Air quality in Indian capital reaches severe levels, posing heightened health risks for more than 30 million residents. Delhi woke up to thick smog and very poor air quality after Diwali as firecracker use pushed AQI past 400 in several areas, with severe conditions forecast. New Delhi, A smoky haze hung over Delhi on Diwali night, blurring streetlights and blanketing neighbourhoods as celebrations intensified across the capital, pushing air quality at 20.