Punjabi Bagh records the highest reading at 452, followed by Jahangirpuri at 450; Gurugram and Noida also report 'very poor' air. A thick layer of smog enveloped Delhi on Wednesday morning, with the city's air quality deteriorating further. The city-level Air Quality Index (AQI) climbed to 373 at 7 am from 331 on Tuesday, remaining in the ‘very poor’ category, according to the Central Pollution Control Board's (CPCB's) real-time data. Both PM2.