As the Air Quality Index (AQI) refused to get better in the Delhi-NCR region, a dense layer of smog engulfed Delhi and its adjacent Noida, Ghaziabad, and other parts of the National Capital Region (NCR) on Wednesday morning as well. With this, the AQI continues to remain in the "very poor" category for 15 consecutive days since October 30, when it was recorded at 307.