MOST POLLUTED CITIES IN THE WORLD

Delhi recorded an annual average PM2.5 concentration of 110 micrograms per cubic metre, the highest among the most populous cities in the world.

Kolkata, West Bengal recorded an annual average PM2.5 concentration of 110 micrograms per cubic metre, said the report "Air Quality and Health in Cities

Kano, Nigeria recorded an annual average PM2.5 concentration of 83.6 micrograms per cubic metre.

Lima, Peru recorded an annual average PM2.5 concentration of 83.6 micrograms per cubic metre.

Dhaka, Bangladesh recorded an annual average PM2.5 concentration of 71.4 micrograms per cubic metre

Jakarta, Indonesia recorded an annual average PM2.5 concentration of 67.3 micrograms per cubic metre.

Lagos, Nigeria recorded an annual average PM2.5 concentration of 66.9 micrograms per cubic metre.

Karachi, Pakistan recorded an annual average PM2.5 concentration of 63.6 micrograms per cubic metre

Beijing, China recorded an annual average PM2.5 concentration of 55 micrograms per cubic metre.