Delhi's air toxic, but these 5 Indian cities are even worse: WHO report

In May, the World Health Organisation said Delhi was the sixth-most polluted city in the country

That time of year when Delhi makes the news for its severely polluted air is back with a vengeance. On November 8, the day after Diwali, pollution in the city reached the “severe-plus emergency” category because of the widespread use of firecrackers. And while people in Delhi can testify to just how bad it gets, what’s even more surprising is that there are five other Indian cities that fare even worse when it comes to PM 2.5 levels.

PM 10 refers to particulate matter with a diameter below 10 μm; PM 2.5 refers to that with a diameter below 2.5 μm.