The latest annual review from Swiss-based air quality company IQAir found that Pakistan was the most polluted country in the world, beating out last year’s champion Chad, up-and-coming contender Bangladesh, and perennial smog heavyweight India.
The 2025 World Air Quality Report found that India could claim the single most polluted city on Earth, Loni, which boasts a level of fine particulate matter (PM2.5) that is about 22 times the safe level recommended by the World Health Organization (W.H.O.).
The five most polluted countries, in order, were Pakistan, Bangladesh, Tajikistan, Chad, and the Democratic Republic of the Congo (DRC). All of the world’s 25 most polluted cities were located in India, Pakistan, or China. Not a single major city in East Asia met the W.H.O. guidelines for air pollution in either 2024 or 2025.
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AirIQ noted that roughly 91 percent of countries and territories in the world fail to meet the
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