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Of the 30 most polluted cities in the world, 21 were in India in 2019. [ 2 ] [ 3 ] As per a study based on 2016 data, at least 140 million people in India breathe air that is 10 times or more over the WHO safe limit [ 4 ] and 13 of the world's 20 cities with the highest annual levels of air pollution are in India. [ 5 ]
Until 2017, India was divided into five zones for the purpose of this survey and each city was scored on 19 indicators. The cities were classified into four colours: green, blue, black, and red, green being the cleanest city, and red the most polluted. None of the cities was rated as green—the best category in the exercise.
This list contains the top 500 cities by PM2.5 annual mean concentration measurement as documented by the World Health Organization covering the period from 2010 to 2022. The January 2024 version of the WHO database contains results of ambient (outdoor) air pollution monitoring from almost 5,390 towns and cities in 63 countries.
Begusarai, a city of half a million people in northern India’s Bihar state, was the world’s most polluted city last year with an average annual PM2.5 concentration of 118.9 — 23 times the ...
New Delhi ranked as the world’s most polluted city on Wednesday morning as residents in the Indian capital woke up to a thick blanket of haze, marking a severe air emergency.. The pollution led ...
At one point in 2019, Noida was the most polluted city in India, but has improved slightly in the last couple of years. 6. Faisalabad, Pakistan. Annual average PM2.5 concentration (μg/m³): 94.2.
It is also the most polluted city in India [11] whose pollution is more than air pollution in Delhi. [ 9 ] [ 12 ] The PM 2.5 of this city is twenty times more than the maximum level recommended by the World Health Organization . [ 13 ]
New Delhi was the world's most polluted capital for the third straight year in 2020, according to IQAir, a Swiss group that measures air quality levels based on the concentration of lung-damaging ...