Pakistan is the most polluted country in the world: India at sixth place, Loni of UP is the most polluted city in the world.
Delhi. India is the sixth most polluted country in the world in terms of levels of fine particulate matter (PM), a major factor in air pollution, while Loni in Uttar Pradesh is the most polluted city globally. This information is given in the World Air Quality Report, 2025. The eighth edition of the report, published by Swiss air quality technology company IQAir, analyzed data from monitoring stations located in 9,446 cities across 143 countries and territories. Five of the world’s ten most polluted cities are in India – Loni, Birnihat, Delhi, Ghaziabad and Ula.
“The world’s 25 most polluted cities are located in India, Pakistan and China, with three of the four most polluted cities in India,” the report said. Loni city is the most polluted city in India, where the annual average concentration of PM2.5 has been recorded at 112.5 micrograms per cubic meter, which is almost 23 percent more than 2024 and more than 22 times the World Health Organization guidelines.
Pakistan is the most polluted country in the world
Pakistan is the most polluted country in the world in terms of fine air pollutant particles while India is at sixth place. This information has come out from the World Air Quality Report, 2025. The eighth report published by Switzerland-based air quality technology company IQAir analyzed data from monitoring stations located in 9,446 cities in 143 countries, regions and territories. According to the report, Pakistan is the most polluted country. After that comes Bangladesh, Tajikistan, Chad and Congo. India is at number six.
If we talk about polluted cities in India, Loni in Uttar Pradesh has been said to be the most polluted city in the world. In this sequence, Delhi is the fourth most polluted city in the world. Not only this, five of the ten most polluted cities in the world are in India, which include Loni, Birnihat, Delhi, Ghaziabad and Ula. Comparing this year’s report with last year’s, 54 countries saw an increase in the annual average of PM2.5, 75 countries saw a decline, two countries had no change and 12 countries were newly included in this year’s data.
India at number six
“Only 14 percent of global cities met the World Health Organization’s annual PM2.5 guideline of five micrograms per cubic meter of airspace, down from 17 percent last year,” the report said. “Only thirteen countries/territories have met WHO’s annual average PM2.5 guidelines. They are French Polynesia, Puerto Rico, US Virgin Islands, Barbados, New Caledonia, Iceland, Bermuda, Reunion, Andorra, Australia, Grenada, Panama and Estonia.”
The report also said that forest fires intensified due to climate change played a major role in the deterioration of global air quality by 2025. Record biomass emissions from Europe and Canada contributed about 1,380 megatons of carbon.
Canada was the most polluted country in North America for the second time in the report’s eight-year history as its second-worst wildfires hit air quality across Canada, the US and parts of Europe. In Europe, 23 countries recorded increases in annual average PM2.5 concentrations, 18 countries recorded declines, and one country was newly added.
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