The world's most polluted cities
Air pollution continues to pose a severe threat to global public health, with many cities around the world enduring alarmingly high levels of harmful pollutants.
Recent studies on global air quality have identified some of the most polluted cities, underscoring the need for stronger actions to manage and improve air quality.
A recent report from IQAir revealed a stark contrast in air quality worldwide. In 2024, only seven countries—Australia, New Zealand, Estonia, Greenland, and a few small island nations—met the World Health Organization’s (WHO) guidelines for PM2.5 pollution levels.
On the other hand, nations like Chad, Bangladesh, Pakistan, the Democratic Republic of the Congo, and India reported significantly higher levels of PM2.5, far exceeding WHO's safe limits.
Several cities around the world have gained notoriety for their poor air quality. Byrnihat, India, holds the distinction of having the highest PM2.5 levels, highlighting the severe air pollution issues in the region.
Delhi, India, frequently faces hazardous air quality, raising significant concerns about public health and quality of life. In Iran, Karaj recorded a staggering PM2.5 level of 180 in 2025, pointing to serious air pollution challenges in the city.
Exposure to high levels of PM2.5, tiny particles that can penetrate deep into the lungs, is linked to various health conditions, including respiratory diseases, heart problems, and even cancer.
Long-term exposure to polluted air can result in significant damage to individuals’ health, making air pollution a critical public health issue that needs immediate attention.
To reduce the impact of air pollution, multiple strategies need to be employed. Governments must enforce strict environmental regulations, implement policies that curb emissions, and invest in cleaner, sustainable infrastructure.
The adoption of cleaner technologies, renewable energy sources, and innovations in transportation can drastically reduce air pollution.
Raising awareness about the sources and health risks associated with air pollution can empower communities to push for cleaner environments.
The global disparity in air quality levels highlights the urgent need for collective action to address this pressing issue.
Governments, industries, and individuals must work together to adopt cleaner practices, enforce regulations, and raise awareness to mitigate the effects of air pollution and protect public health.
