Masood Khalid Khan
There is something deeply unsettling about leading a global ranking that nobody wants to top. In 2025, Pakistan earned that grim distinction. According to the annual air quality report published by IQAir, the Swiss firm that monitors pollution levels across the world, Pakistan ranked as the most polluted country on earth, with concentrations of fine particulate matter known as PM2.5 reaching levels up to thirteen times higher than the threshold the World Health Organization considers safe for human health. This is not a bureaucratic footnote in an environmental report. It is a public health emergency that touches every citizen who breathes the air above this country.
PM2.5 refers to microscopic particles smaller than 2.5 micrometres in diameter, fine enough to bypass the nose and throat entirely and penetrate deep into the lungs and bloodstream. Prolonged exposure is linked to respiratory disease, cardiovascular illness, premature birth, cognitive decline in children, and early death. The WHO sets the safe annual average at five micrograms per cubic metre. Pakistan’s air, particularly in its densely populated urban and industrial corridors, is registering concentrations that dwarf that benchmark many times over. To put it plainly, millions of Pakistanis are breathing air that poses a documented, measurable risk to their lives every single day.
The IQAir report, which assessed 143 countries and territories, found that 130 of them failed to meet the WHO guideline in 2025. That is a sobering indictment of global inaction on air quality. Yet within that broad failure, Pakistan stands in a category of particular severity. Bangladesh ranked second on the most polluted list, and Tajikistan third, but the spotlight on South Asia is impossible to ignore. The world’s twenty-five most polluted cities were drawn entirely from India, Pakistan, and China, a concentration that reflects the intersection of rapid industrialization, explosive urban growth, agricultural burning, aging vehicle fleets, and regulatory systems that have struggled to keep pace with the scale of the problem.
India’s Loni recorded the highest PM2.5 concentration of any city on earth in 2025, at 112.5 micrograms per cubic metre, followed by Hotan in China’s Xinjiang region at 109.6 micrograms. Pakistani cities feature prominently in the lower ranks of that same list, a pattern that has repeated itself year after year with little structural improvement. The seasonal smog that descends on Lahore and other cities in the Punjab every winter has become so routine that residents have normalized it. Schools issue precautionary notices, hospitals brace for a surge in respiratory admissions, and life continues in a haze that should be treated as a national crisis but is instead absorbed as an inconvenient seasonal fact.
One important dimension of the 2025 report that deserves attention is the data gap left by the United States government’s decision last March to shut down its global pollution monitoring programme, which had compiled air quality data from embassy and consulate buildings across the world. The programme was discontinued citing budget constraints. The consequences were immediate and significant. Chad, which held the top position on the most polluted list in 2024, dropped to fourth place in 2025, but the lead researcher on the IQAir report, Christi Chester Schroeder, was explicit about the reason. The apparent improvement in Chad’s numbers was not a reflection of cleaner air. It was a reflection of missing data. Three countries, Burundi, Turkmenistan, and Togo, were excluded from the 2025 rankings entirely because the withdrawal of American monitoring had left their data too incomplete to use.
This development carries a warning that extends well beyond Chad. When the world’s primary environmental superpower withdraws its resources from global monitoring infrastructure, it does not make the pollution disappear. It simply makes it invisible. The political consequences of invisible data are predictable. Governments face less pressure to act. International bodies have less leverage. Citizens have no numbers to point to. The decision to dismantle that monitoring network, whatever its fiscal justification, was a step backward for accountability and public health governance everywhere it applied.
The overall picture that emerges from the 2025 report is one of mixed and uneven progress. On the positive side, thirteen countries and territories maintained PM2.5 levels within WHO guidelines, an improvement from seven the previous year. Australia, Iceland, Estonia, and Panama were among those that met the standard. Several Southeast Asian countries, including Laos, Cambodia, and Indonesia, reported meaningful reductions in pollution, largely attributed to the wetter and windier conditions brought by the La Nina weather pattern rather than policy intervention. Mongolia recorded a striking thirty-one percent fall in average concentrations. In total, seventy-five countries reported lower PM2.5 levels in 2025 compared to the previous year.
Yet fifty-four countries recorded higher average concentrations, and only fourteen percent of the world’s cities met the WHO standard in 2025, down from seventeen percent the year before. Canadian wildfires pushed particulate pollution across the United States and reached as far as Europe, a reminder that air pollution in an interconnected atmosphere respects no border.
For Pakistan, these global trends are context rather than comfort. The country has sat near the top of the most polluted rankings for years. The causes are well documented. Unchecked vehicular emissions from an aging and poorly maintained fleet, brick kilns operating on traditional inefficient designs, stubble burning in agricultural Punjab and Haryana across the border, industrial discharge into the air with minimal regulation, urban construction without dust control, and a municipal infrastructure unable to manage the waste that too often ends up burned in open dumps. All of these are solvable problems. None of them are mysteries. What has been missing is sustained political will.
Pakistan’s government must treat air quality as what it actually is: a matter of national survival. The smog is not an aesthetic inconvenience. It is shortening lives, diminishing the cognitive capacity of children growing up in it, increasing the burden on a health system already stretched beyond its limits, and quietly extracting an enormous economic toll in lost productivity and medical expenditure.
Being ranked the world’s smoggiest country is not a statistic to be noted and filed. It is a verdict that demands a response.
