Reaction from the field
In 2025, Loni, a city in Ghaziabad, India, has been designated as the world’s most polluted city, with an alarming annual average PM2.5 concentration of 112.5 µg/m³. This level of air pollution is more than 22 times the World Health Organization’s permissible guidelines, raising serious concerns about public health and environmental safety.
The causes of this severe air quality crisis are multifaceted. India’s air quality has been significantly impacted by a combination of factors, including vehicular emissions, industrial discharges, crop residue burning, and construction dust. These elements have converged to create an environment where Loni’s air quality has deteriorated to unprecedented levels.
In the broader context, India ranks as the sixth most polluted country in 2025, with a national PM2.5 concentration of 48.9 µg/m³. This places the country in a precarious position regarding air quality, as cities across India, including the capital New Delhi, struggle with similar issues. New Delhi itself has been reported as the most polluted capital city globally, with a PM2.5 concentration of 82.2 µg/m³.
Supporting these alarming statistics, Byrnihat in Meghalaya follows closely behind Loni, being the third most polluted city with a PM2.5 concentration of 101.1 µg/m³. Meanwhile, Ghaziabad, which encompasses Loni, ranks seventh with a PM2.5 concentration of 89.2 µg/m³. These figures illustrate a troubling trend in air quality across the region.
As residents of Loni grapple with the health implications of such high pollution levels, the situation raises questions about the effectiveness of current environmental policies and the urgency for action. The cleanest city in the world, Nieuwoudtville in South Africa, boasts a PM2.5 concentration of just 1.0 µg/m³, highlighting the stark contrast and the dire need for improvement in Loni and similar cities.
While there have been discussions regarding potential measures to combat air pollution in Loni, details remain unconfirmed. The uncertainty surrounding future developments adds to the anxiety of residents who are increasingly aware of the health risks posed by their environment.
As Loni continues to hold the unfortunate title of the world’s most polluted city, the implications for public health, policy, and community action are profound. The need for comprehensive strategies to address air quality issues has never been more critical, as the stakes rise for the health and well-being of its inhabitants.
