People of Delhi NCR are facing one of the worst ever spells of air pollution.
Waking up to mornings that have an overhanging all pervasive grey, opaque and overwhelming smog in the air. The city’s landscape has disappeared. 
When we step outside, acrid air almost immediately scorches our nostrils and stings our eyes. It is the Killer Pollutant in the air that we breathe.

It has forced the authorities to declare a public health emergency.
What are these pollutants? How are the government fighting against them?