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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.
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 ]
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 ...
New Delhi again topped a real-time list of the world's most polluted cities compiled by Swiss group IQAir, which put the Indian capital's AQI at 640 in the "hazardous" category on Friday, followed ...
Indian cities alone generate more than 100 million tons of solid waste a year. Street corners are piled with trash. Public places and sidewalks are despoiled with filth and litter, rivers and canals act as garbage dumps. In part, India's garbage crisis is from rising congestion. India's waste problem also points to a stunning failure of ...
India was home to 35 of the world's 50 most polluted cities, according to IQAir's 2020 World Air Quality Report, which gathered data for 106 countries. ... New Delhi was the world's most polluted ...