Delhi in November was more polluted than the past four years in spite of firecracker ban

This year farmers also started burning crop residue early due to early harvesting this year and hence the farm fires raged for a longer time.

from http://www.firstpost.com/tech/science/delhi-in-november-was-more-polluted-than-the-past-four-years-in-spite-of-firecracker-ban-9072521.html