Answer: Pakistan
Notes: Pakistan ranked as the most polluted country in 2025 as per IQAir report. PM2.5 levels were about 13 times higher than limits set by World Health Organization. Only 13 countries met the WHO safe limit (<5 µg/m³), up from 7 in 2024. 130 out of 143 countries failed to meet WHO air quality standards. Bangladesh and Tajikistan ranked second and third most polluted. Only 14% of global cities met WHO standards, down from 17% in 2024.
