Reaction from the field
Loni, a city in Ghaziabad, India, has been identified as the world’s most polluted city in 2025, with an annual average PM2.5 concentration of 112.5 µg/m³. This level of pollution is more than 22 times the World Health Organization’s permissible guidelines, raising significant health concerns for its residents.
India, as a whole, ranks as the sixth most polluted country globally, with a national PM2.5 concentration of 48.9 µg/m³. The situation in Loni is particularly alarming, especially when compared to other cities in the region. New Delhi, the capital city, ranks as the most polluted capital in the world, with a PM2.5 concentration of 82.2 µg/m³, while Ghaziabad follows closely behind at seventh place with 89.2 µg/m³.
The causes of this severe air quality crisis in Loni can be attributed to a combination of factors, including vehicular emissions, industrial discharges, crop residue burning, and construction dust. These elements contribute to the deteriorating air quality, posing serious health risks to the population. The alarming statistics highlight the urgent need for effective measures to combat air pollution in the region.
In a stark contrast, the cleanest city in the world, Nieuwoudtville in South Africa, boasts an annual average PM2.5 concentration of just 1.0 µg/m³. This comparison underscores the severity of Loni’s pollution levels and the challenges faced by its residents.
Byrnihat in Meghalaya has also been noted for its high pollution levels, ranking third in 2025 with a PM2.5 concentration of 101.1 µg/m³. This indicates that the air quality crisis is not limited to Loni but is a broader issue affecting several cities across India.
As the situation develops, it remains crucial for local authorities and the government to implement strategies aimed at reducing pollution levels. The health implications of such high PM2.5 concentrations are dire, with increased risks of respiratory diseases and other health complications for the population.
Details remain unconfirmed regarding specific actions that will be taken to address this crisis. However, the urgency of the situation calls for immediate attention and action to safeguard the health of Loni’s residents and improve air quality in the region.
