According to independent online air quality index monitor AirVisual, New Delhi was the most polluted major city in the world, at twice the level of Lahore in Pakistan, which was a distant second.
Several cities in the sub-continent are smothered in toxic air, causing a major health emergency in the region.
The United Nations says Bosnia and Herzegovina is estimated to be the second worst country in the world for air pollution.
The study uses the word "risk" 561 times in a 740-page report but says changes in the way the world eats, buys things, gets its energy and handles its waste could help fix the problems.
South Korea's parliament on Wednesday passed a set of bills to fight air pollution that has blanketed parts of the country in recent years, with one bill designating the problem a ''social disaster''.
Though the city's air quality index is crossing alarming levels, comparable with cities like Delhi, and harming public health like never before, the issue remains buried under the usual war talk.
The world’s largest steel company, ArcelorMittal, operates a production line in Bosnia's Zenica town, where locals accuse the behemoth steelmaker of violating environmental rules and causing a serious health hazard.
The World Health Organization (WHO) has conducted a study to determine particulate pollution worldwide. Above all, cities in poorer countries have values far above those recommended. Which are these.
A new World Health Organization report said that around 90 percent of the world's children are breathing toxic air.
According to World Health Organization (WHO) data, 14 Indian cities are among the world's 20 most polluted, with Dehli making no progress in tackling its pollution problem.
Despite an investment on clean technology, China continues to battle poor air and water quality as one of the world's most polluted nations.
New report says almost 6,000 people died prematurely in 2014 from illnesses that are known to be caused or aggravated by nitrogen dioxide, a gas produced by diesel engines.
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