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Pakistan is the most polluted country in the world, followed by Bangladesh and Tajikistan while India is at the sixth spot, according to the 8th World Air Quality report.
The 2025 edition of the report published by IQAir, a Swiss air quality technology company, is based on analysis of data from monitoring stations across 9,446 cities in 143 countries, regions and territories.
The data has been sourced from more than 40,000 regulatory monitoring stations and low-cost sensors managed by a wide array of contributors, including government agencies, universities, non-profit organisations, private enterprises and engaged citizen scientists around the world.
While China is at the 20th position amongst the most polluted countries in the world, the USA is at the 120th spot and the UK is at the 110th spot.
According to the report, only 13 countries or territories — French Polynesia, Puerto Rico, US Virgin Islands, Barbados, New Caledonia, Iceland, Bermuda, Reunion, Andorra, Australia, Grenada, Panama and Estonia — met the World Health Organisation’s (WHO) annual average PM2.5 guideline.
The report said, “130 out of 143 countries or territories (91 per cent) exceeded the WHO annual average PM2.5 guideline value. The five most polluted countries were Pakistan, Bangladesh, Tajikistan, Chad and the Democratic Republic of the Congo. The world’s 25 most polluted cities were all located in India, Pakistan and China, with India home to three of the four most polluted.”
Nieuwoudtville, South Africa, was the world’s cleanest city, with an annual average PM2.5 concentration of 1.0 µg/m³.
Among cities, Uttar Pradesh’s Loni is the most polluted, followed by Hotan in China and Byrnihat in Meghalaya, India. Delhi is at the fourth spot, followed by Faisalabad in Pakistan.
