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While Delhi remains the most polluted city in the world, an estimated 7 million people across the globe are dying each year from exposure to ambient and household air pollution, WHO (World Health Organization) said in a report released on 2 May 2018. WHO compiled air quality data for mega-cities with a population of 14 million or more and found that Greater Cairo in Egypt is the second most polluted city after Delhi followed by Dhaka, the capital of Bangladesh. While Mumbai stood fourth in pollution, Beijing came out to be the fifth most polluted city in the world, the WHO report said. Ambient air pollution alone caused around 4.2 million deaths in 2016, while household air pollution from cooking with polluting fuels and technologies caused an estimated 3.8 million deaths in the same period, the report stated.