As temperatures fall, air quality worsens in New Delhi
Updated : December 31, 2018 08:42 PM IST
Senior government officials said the main reasons for the surge in the amount of toxic smog trapped over New Delhi were unusually cold air, including fog, and slow wind speeds.
The World Health Organization said this year India was home to the world's 14 most polluted cities. New Delhi was ranked the sixth most polluted.