The Air Quality Index (AQI) in Delhi reached the 'poor' category ahead of Diwali, with a reading of 200 at 5:30 am, according to the Air Quality Early Warning System. Anand Vihar recorded the worst air quality on Tuesday morning, with the AQI reaching 374 (very poor). Several other localities, including Dwarka, Jahangirpuri and Rohini, also recorded poor air quality.