Delhi Environment Minister Gopal Rai on Friday said that the sudden increase in the number of stubble burning incidents and firecrackers are the two major reasons for heavy pollution in the Delhi region.

Speaking to the media, Rai said, "According to NASA pictures, there are almost 3,500 stubble burning incidents taking place in neighbouring states." In a bid to curb air pollution, Gopal Rai on Friday installed an anti-smog gun to improve the Air Quality in national quality.