Pakistan has emerged as the most polluted country worldwide in 2025, facing alarmingly high levels of air contamination. This conclusion comes from a comprehensive analysis conducted by the Swiss-based air quality monitoring organization IQAir, which tracks pollution data across the globe. The findings reveal that concentrations of PM2.5 particles—tiny airborne pollutants capable of penetrating deep into the lungs and bloodstream—are up to thirteen times above the safety thresholds established by the World Health Organization (WHO). Such elevated levels pose severe risks to public health, contributing to respiratory illnesses, cardiovascular diseases, and premature deaths.
The report evaluated air quality in 143 countries and territories, uncovering a grim reality: 130 of these regions failed to comply with the WHO’s recommended air quality standards. This widespread non-compliance underscores the persistent and growing challenge of air pollution on a global scale. Only a small fraction, precisely 13 countries, managed to keep their PM2.5 levels below the WHO’s guideline of 5 micrograms per cubic meter, demonstrating that clean air remains a rare commodity in many parts of the world.
Following Pakistan, Bangladesh and Tajikistan were identified as the second and third most polluted nations, respectively. This ranking highlights a troubling pattern of air quality degradation in South Asia and Central Asia, regions grappling with rapid urbanization, industrial emissions, and vehicular pollution. Interestingly, Chad, which held the unfortunate distinction of being the most polluted country in 2024, slipped to fourth place this year. Experts caution that this shift may not necessarily indicate an improvement but could be attributed to gaps in data collection, partly caused by the discontinuation of a US global air monitoring program. The absence of this program has led to significant data shortages, complicating efforts to accurately track pollution trends in several countries and forcing the exclusion of some from the rankings due to insufficient information.
When examining urban centers, the city of Loni in India was recorded as the most polluted city worldwide, with Hotan in China following closely behind. The top 25 most polluted cities were exclusively located within India, Pakistan, and China, emphasizing the severe air quality challenges faced by these densely populated and industrially active regions. The report also noted a worrying decline in the number of cities meeting WHO air quality standards, dropping from 17% in 2024 to just 14% in 2025. This downward trend signals a deterioration in urban air quality, exacerbated by factors such as wildfires in Canada, which have contributed to elevated pollution levels extending into parts of the United States and Europe.
Despite these concerning developments, the report highlighted some positive trends. Countries including Australia, Iceland, Estonia, and Panama successfully maintained air quality within safe limits, showcasing effective environmental policies and monitoring. Additionally, nations like Laos, Cambodia, and Indonesia experienced reductions in pollution levels, largely due to favorable meteorological conditions that helped disperse airborne contaminants. Overall, 75 countries recorded a decline in PM2.5 concentrations compared to the previous year, while 54 countries saw an increase, reflecting a mixed global picture in the fight against air pollution.
These findings serve as a stark reminder of the urgent need for coordinated international efforts to address air pollution, which remains a critical public health and environmental issue. For Pakistan, the report underscores the necessity of implementing stringent pollution control measures, enhancing monitoring infrastructure, and promoting sustainable urban development to protect the health of millions of citizens and improve the quality of life across the country.
