According to the Global Air Quality Report published by the Swiss company IQAir, India slid from fifth to eighth place in terms of the world's most polluted nations in 2022. 39 of the world's 50 most polluted cities are located in India, according to the survey. According To a Report, India Is Home to 39 of the World's 50 Most Polluted Cities
Almost 30,000 ground-based monitors were employed to compile the report's data, which came from 131 different countries. The top three polluting nations in the world, according to the research, are Pakistan, India, and Bangladesh. Also among the few other nations that were unable to meet the World Health Organization's limit were Estonia, Australia, Finland, Iceland, Grenada, and New Zealand (WHO).
According to studies, 20–35% of India's PM2.5 pollution comes from the transportation sector, with the remainder coming from industrial facilities, coal-fired power plants, and biomass burning. According to reports, Bhiwadi in Rajasthan was ranked third among the most polluted cities in the world, while Delhi came in at number four with PM2.5 levels that were close to 20 times the permissible limit.
Lahore in Pakistan, Hotan in China, Bhiwadi in Rajasthan, and Delhi took the top three spots on the list, respectively.
The research also made a distinction between "greater" Delhi and New Delhi, the capital, saying that Delhi has historically been the most polluted capital in the world. Both cities are among the top 10, but N'Djamena, the capital of Chad, holds the title of the most polluted capital in the world.