The Central Pollution Control Board says that levels of tiny particulate matter (PM 2.5 in short), which reaches deep into your lungs, increased by more than 200% the next day after Diwali, India's most expensive festival.

The Monday figure of 750 micrograms per cubic metre is 30 times a mean guideline set by the World Health Organization (WHO) of 25 micrograms per cubic metre on average over a 24-hour period.

It also means that the normal Delhi air is already 15 times the acceptable limits.

Via BBC

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