After a week-long gas chamber-like conditions, Delhi heaved a sigh of relief as the Air Quality Index improved from critical to severe on Tuesday. According to SAFAR, the Ministry of Earth Science-backed special app, the AQI in Delhi was registered at 411 in morning on Tuesday. Even Gurugram that recorded an unbreathable AQI of 833 on Monday, the morning of Tuesday seemed to be slightly better. The Air Quality Index in Gurugram was registered at 405.