Pakistan has been identified as the world’s smoggiest country in 2025, with levels of PM2.5 exceeding World Health Organization (WHO) recommendations by up to 13 times. This finding, detailed in a recent IQAir report, suggests a potentially escalating global trend, particularly in Asia.
The Scale of the Problem
The IQAir report analyzed 9,446 cities across 143 countries and found that only 13 countries and territories met the WHO’s air quality standard of less than 5 micrograms per cubic meter of PM2.5. A staggering 130 countries failed to meet this benchmark. Bangladesh and Tajikistan followed Pakistan as the second and third most polluted countries, respectively.
The top 25 most polluted cities globally are all located in China, India, and Pakistan. India’s Loni was identified as the most polluted city in 2025, with an average PM2.5 concentration of 112.5 micrograms per cubic meter.
What’s Driving the Pollution?
Multiple factors contribute to this pollution, including combustion from industrial emissions, wildfires, and vehicle exhaust. In Pakistan, the burning of agricultural waste is a major factor, particularly in cities like Lahore. Climate change is also exacerbating the problem, with warming winters and increased humidity potentially contributing to increased pollution events.
Regional Responses
Several countries are taking steps to address the crisis. Pakistan has implemented stricter environmental regulations concerning industry and vehicle emissions, alongside campaigns to reduce agricultural waste burning. Bangladesh is investing in cleaner energy sources and improving public transportation. Tajikistan is focusing on reducing household wood burning and reforestation efforts. India has initiated programs to improve air quality in cities like Loni, including limiting polluting fuels and closing polluting factories.
A Note of Optimism
Suriname was noted in the IQAir report as having relatively clean air, attributed to its low industrialization and extensive forest cover.
Health Consequences
Exposure to PM2.5 is linked to a range of serious health problems, including premature births and neurological disorders like dementia, Parkinson’s disease, and Alzheimer’s disease. The long-term health consequences of prolonged exposure to polluted air are becoming increasingly clear.
Challenges in Data Collection
The accuracy of global air quality monitoring is facing challenges. The discontinuation of the US global monitoring program has created data gaps, impacting the 2025 report’s coverage and excluding Burundi, Turkmenistan, and Togo due to insufficient data.
Frequently Asked Questions
What is PM2.5?
PM2.5 refers to particulate matter with a diameter of 2.5 micrometers or less. These tiny particles are particularly dangerous as they can penetrate deep into the lungs, and bloodstream.
What is a healthy AQI level?
An AQI of 0-50 is considered great, indicating minimal health risk. Levels above 100 are considered unhealthy for sensitive groups.
How does climate change affect air quality?
Climate change contributes to increased wildfires and altered weather patterns, both of which can worsen air pollution.
As air pollution continues to worsen in many parts of the world, what role do you believe international cooperation will play in finding effective solutions?
