From the time WHO has declared Delhi as the most polluted city of the world, the city has hogged limelight for being dangerous to live in. The city has been found to have the highest levels of particulate matter, also known as PM 2.5, known to be most harmful to human health. kids and elderly have been advised to stay at home as much as possible. Infact the situation is so worse that Delhi govt suggested shutting down the schools for 10 days.