NEW DELHI, Nov. 18 -- Witnessing improvement in Delhi's air quality level from the "severe" category to "poor" category, Chief Minister Arvind Kejriwal said as soon as stubble burning stopped, the air in the national capital has cleared up. Air quality in North India saw a significant improvement on Sunday after stubble burning in the states of Punjab and Haryana came to an end.

In a series of tweets by Kejriwal commented on the strong link between stubble burning in neighbouring states and the deterioration in air quality observed over the last few weeks.

"A very strong correlation can be seen between stubble burning and the spike in air pollution in North India. As soon as stubble burning began in the first week of October, the Air Qu...