A thick blanket of smog covered several parts of Delhi on Monday and air quality was in 'very poor' category, with reading at Air Quality Early Warning System (EWS) showing AQI at 372 at 7 am. Bawana (412) was only station to witness 'severe' air with AQI at 412, while Wazirpur and Jahangirpuri saw AQI at 397 and 394 respectively.