The New Indian Express. Delhi's air quality improved to the 'poor' category on Sunday, with the Air Quality Index (AQI) settling at 290 at 4 pm, offering some respite after several days of 'very poor' pollution levels. Of the 58 air quality monitoring stations in the city, 34 recorded 'poor' air quality and 23 'very poor,' while one recorded 'moderate' air quality. NSIT Dwarka recorded the worst air quality with.