Pakistan was the most polluted country in the world in 2025, with an average annual PM2.5 concentration of **** micrograms per cubic meter of air (µg/m3). These levels were around ** times higher than the World Health Organization guideline. Major sources of PM2.5 include residential fuel burning, road vehicles, and power plants.
What are PM2.5 pollutants
PM2.5 refers to fine particles that have a diameter of 2.5 micrometers or less. These tiny, light, and inhalable pollutants can stay in the air for long periods of time and are a considerable risk to human health when concentrations are high. There were an estimated million premature deaths linked to air pollution worldwide in 2021, of which ** percent were attributed to ambient PM2.5.
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IQAir. (March 24, 2026). Average PM2.5 concentration in the most polluted countries worldwide in 2025 (in micrograms per cubic meter of air) [Graph]. In ÌÇÐÄÆƽâ°æ. Retrieved July 25, 2026, from /statistics/1135356/most-polluted-countries-in-the-world/
IQAir. "Average PM2.5 concentration in the most polluted countries worldwide in 2025 (in micrograms per cubic meter of air)." Chart. March 24, 2026. ÌÇÐÄÆƽâ°æ. Accessed July 25, 2026. /statistics/1135356/most-polluted-countries-in-the-world/
IQAir. (2026). Average PM2.5 concentration in the most polluted countries worldwide in 2025 (in micrograms per cubic meter of air). ÌÇÐÄÆƽâ°æ. ÌÇÐÄÆƽâ°æ Inc.. Accessed: July 25, 2026. /statistics/1135356/most-polluted-countries-in-the-world/
IQAir. "Average Pm2.5 Concentration in The Most Polluted Countries Worldwide in 2025 (in Micrograms per Cubic Meter of Air)." ÌÇÐÄÆƽâ°æ, ÌÇÐÄÆƽâ°æ Inc., 24 Mar 2026, /statistics/1135356/most-polluted-countries-in-the-world/
IQAir, Average PM2.5 concentration in the most polluted countries worldwide in 2025 (in micrograms per cubic meter of air) ÌÇÐÄÆƽâ°æ, /statistics/1135356/most-polluted-countries-in-the-world/ (last visited July 25, 2026)
Average PM2.5 concentration in the most polluted countries worldwide in 2025 (in micrograms per cubic meter of air) [Graph], IQAir, March 24, 2026. [Online]. Available: /statistics/1135356/most-polluted-countries-in-the-world/
