New Delhi, Nov 1 (PTI) The maximum temperature in Delhi on Tuesday settled at 33 degrees Celsius, two notches above normal, according to the India Meteorological Department.The minimum temperature was recorded at 15.2 degrees Celsius, a notch below the season"s average, the IMD said.The relative humidity was 62 per cent at 5:30 pm.Delhi"s air quality worsened, slipping into the "severe" category.The city"s 24-hour air quality index (AQI) stood at 424 at 4 pm, the worst since December 26 last year when it was 459.On Monday, Delhi"s overall AQI stood at 361 (very poor) at 8 pm.An AQI between zero and 50 is considered "good", 51 and 100 "satisfactory", 101 and 200 "moderate", 201 and 300 "poor", 301 and 400 "very poor", and 401 and 500 "severe". PTI KND DIV DIV