Air pollution in Delhi worsens to 'severe' category

The air quality of Delhi worsened to "severe" category on Tuesday. According to the Central Pollution Control Board Air Quality Index (AQI) at 8.30 a.m was 413.The AQI at Bawana, Wazirpur, Anand Vihar and Rohini was 445, 442, 442 and 440 respectively.