Air pollution remains one of the greatest public health challenges globally, affecting millions of people. Swiss air quality technology firm IQAir has released its annual global rankings, measuring fine particulate matter (PM2.5) concentrations in various nations and cities. The report paints a somber picture of the air we breathe.
Pakistan: The Most Polluted Country
IQAir's latest report reveals that Pakistan has become the world's most polluted country, with an average PM2.5 concentration of 67.3 micrograms per cubic meter (µg/m³). This is nearly 13 times higher than the World Health Organization's (WHO) annual guideline of 5 µg/m³. Major cities like Lahore regularly rank among the most polluted globally, especially during winter. Factors such as industrial emissions, traffic pollution, crop residue burning, coal use, and thousands of brick kilns contribute to the crisis. The smog season has shifted from an environmental issue to a public health emergency, disrupting daily life and transport, and prompting government emergency measures.
What is PM2.5?
PM2.5 refers to particulate matter 2.5 micrometers or smaller in diameter. These tiny particles can penetrate the lungs and bloodstream, causing severe health harm. PM2.5 has become the global benchmark for assessing air quality due to its serious health implications.
World's Most Polluted Countries
Based on IQAir's rankings for annual average PM2.5 concentrations, the five most polluted countries are:
- Pakistan – 67.3 µg/m³
- Bangladesh – 66.1 µg/m³
- Tajikistan – 46.3 µg/m³
- Chad – 45.4 µg/m³
- Democratic Republic of the Congo – 40.8 µg/m³
India ranks sixth with an average annual PM2.5 concentration of 38.2 µg/m³. South Asian countries continue to struggle with some of the worst air qualities globally.
Why Are These Countries So Polluted?
Air pollution stems from multiple factors rather than a single source. Major contributors include:
- Vehicle emissions from rapidly growing urban populations
- Coal-fired power plants and industrial activities
- Construction dust and unpaved roads
- Agricultural practices such as crop residue burning
- Household use of biomass fuels for cooking and heating
- Seasonal weather patterns that trap pollutants near the ground
High population density, industrial growth, and adverse climatic conditions lead to extended periods of poor air quality in South Asia.
A Worldwide Issue
A worrying revelation from IQAir's study is that air pollution affects more than just a few countries. According to the findings, 91% of the countries examined failed to meet WHO's annual PM2.5 guideline value.
Why Travellers Should Pay Attention
Air quality is increasingly influencing travel decisions. Visiting polluted areas can result in limited visibility, flight delays, and health risks, especially for those with asthma, heart disease, or respiratory issues. Travellers can reduce exposure by checking air quality information before travel, minimizing outdoor activities on high-pollution days, staying hydrated, and wearing high-quality masks.
The Road Forward
Air pollution is a silent crisis, often unnoticed but with immense health and economic impacts. IQAir's latest list reminds us that much work remains to improve global air quality. Until significant progress is made, clean air will remain out of reach for many.
This article is based on the IQAir 2023 World Air Quality Report and lifestyle news from the TOI Lifestyle Desk.
