The other cities in India that made the list of 20 were Ghaziabad, Faridabad, Bhiwadi, Noida, Patna, Lucknow, Jodhpur, Muzaffarpur, Varanasi, Moradabad, Agra, Gaya and Jind. Out of the 20 most polluted cities in the world past year, 18 were from India, Pakistan, and Bangladesh.
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"The report is a reminder to us indicating that our efforts and actions to reduce the invisible killer, i.e., air pollution, are not enough and we need to do much more than already planned and done", said Pujarini Sen of Greenpeace India.
The World Bank reckons as much as 8.5 per cent of India's GDP is racked up in health care costs and productivity losses due to pollution.
Air pollution will take an estimated seven million lives globally in the next year, while costing the world's economy almost 225 billion United States dollars, the Greenpeace said.
The executive director of Greenpeace Southeast Asia said that these high pollution numbers can have enormous impacts on health and even our wallets.
The index measures the presence of fine particulate matter known as PM2.5, a pollutant that can fester deep in the lungs and bloodstream of human beings.
The Indian capital of Delhi, which has raised a million questions over the last two years with its pollution level breaking all limits, was placed at the 11th spot in the list.
When ranked by country, Bangladesh emerged as the most polluted followed by Pakistan and India respectively.
The report said data was sourced from a range of government monitoring sources. IQAir AirVisual has included data from air quality monitors operated by private organisations and individuals.