<span style="color: #222222;">The air pollution level in the National Capital continued to be in severe category. The air quality index, AQI was recorded at 420 this evening by the Central Pollution Control Board. </span><br />'' <br />'' <span style="color: #222222;">All construction activities involving excavation have been stopped in the city till tomorrow. An aggressive clean air campaign is also underway to monitor and report polluting activities as well as to ensure quick action. </span>