Helena Joyce
Air pollution is one of the most pressing health issues of our time, causing nearly 4.5 million premature deaths in 2019, according to The Lancet. The World Health Organization (WHO) sets a target guideline for air pollution of 0-10 µg/m³, with anything above 35.5 considered unhealthy for sensitive groups, and anything over 55.5 unhealthy for all. In 2022, IQAir, a Swiss technology company that tracks air quality data from monitors around the world, found that just 13 out of 131 countries and regions met the WHO's recommended range. This article will explore the countries with the most polluted air, the causes, and the potential solutions.
| Characteristics | Values |
|---|---|
| Countries with the most air pollution in 2022 | Chad, Bangladesh, Pakistan, India, Tajikistan, Kyrgyzstan, Ethiopia, Armenia, Iran, Uzbekistan, Bosnia and Herzegovina, Nigeria, Uganda, Nepal, Saudi Arabia, Qatar, Rwanda, Sudan, United Arab Emirates, Egypt, Kuwait, Burkina Faso |
| Region with the most air pollution | North Africa, the Middle East, and the Indian subcontinent |
| Major sources of air pollution | Desert dust, vehicle emissions, biomass burning, industrial emissions, heavy traffic, regional dust storms, petroleum industry, coal- or oil-burning power plants, factories, agricultural burning |
| Health impact | Air pollution is responsible for more than 10% of all deaths worldwide (nearly 4.5 million premature deaths in 2019) |
| Global organizations' guidelines | The World Health Organization's (WHO) target for air pollution is 0-10 µg/m³. IQ Air considers measurements above 35.5 to be unhealthy for sensitive groups, levels between 55.5 and 150.4 to be unhealthy for all, and anything higher is either very unhealthy or hazardous. |
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What You'll Learn
- India: 14 of the 15 most contaminated cities in the world are in India
- Chad: The most polluted country in 2022, with a PM2.5 concentration of 89.7
- Bahrain: PM2.5 levels fluctuated from 59.8 in 2018 to 66.6 in 2022
- Bangladesh: Despite improvements, Bangladesh still ranks among the worst globally
- Iraq: Pollution has sharply increased due to industrial growth and traffic congestion
India: 14 of the 15 most contaminated cities in the world are in India
India is one of the countries with the worst air pollution. According to a 2024 report, 96% of the country's population, or 1.3 billion people, live with air quality seven times higher than the World Health Organization's (WHO) guidelines. The report also ranked major population centers in the country, with New Delhi as the 6th most polluted city in the world. Furthermore, 29 of the 30 most polluted cities in the world are in India, Pakistan, or Bangladesh, with Lahore in 5th place and Dhaka in 24th.
The primary sources of air pollution in India are vehicle emissions, biomass burning, and industrial activities. These activities release particulate matter, primarily PM2.5, which are microscopic particles or droplets in the air that are 2.5 micrometers or less in diameter. PM2.5 pollution poses significant health risks and is responsible for more than 10% of all deaths worldwide, affecting nearly every organ and system in the human body.
India is not alone in its struggle with air pollution. Other countries in South Asia, such as Pakistan and Bangladesh, also have highly polluted cities. Additionally, countries in Africa, the Middle East, and South America face similar challenges, but data from these regions is limited due to a lack of monitoring stations. For example, Chad, which was the most polluted country in 2022, was not included in the 2023 rankings due to insufficient data.
To address the air quality crisis, experts emphasize the need for significant changes in energy infrastructure and agricultural practices. While some countries, like China, have successfully improved their air quality through clean air policies, others continue to face challenges in meeting global environmental standards. The implementation of green initiatives, such as solar and wind energy, eco-friendly building materials, and non-toxic products, is becoming increasingly important to prevent further damage to the planet and improve public health outcomes.
In summary, India is highly affected by air pollution, with the majority of its population breathing unsafe air. The country's high pollution levels are driven by various factors, and similar trends are observed in other regions, particularly in South Asia. Addressing this issue requires a combination of policy interventions, infrastructure improvements, and a shift towards environmentally sustainable practices and energy sources.
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Chad: The most polluted country in 2022, with a PM2.5 concentration of 89.7
Chad was the world's most polluted country in 2022, with a PM2.5 concentration of 89.7. This was a notable increase from the previous year, 2021, when Chad recorded a PM2.5 concentration of 75.9. The primary drivers of Chad's poor air quality are desert dust, vehicle emissions, and biomass burning.
PM2.5 refers to fine particulate matter that is 2.5 micrometres or smaller in diameter. These particles are released into the air through the burning of fossil fuels, wood, and other materials. They pose a significant risk to human health as they can be inhaled and affect multiple organs in the body. The World Health Organization (WHO) has set a target of 0-10 µg/m³ for air pollution, with anything above 35.5 considered unhealthy for sensitive groups and anything above 55.5 considered unhealthy for everyone. Chad's PM2.5 concentration far exceeds these guidelines, indicating a severe air quality crisis.
Chad is not alone in its struggle with air pollution. Many countries in Africa, South Asia, and the Middle East also face similar challenges. For example, in 2022, Bangladesh recorded a PM2.5 concentration of 65.8, a slight improvement from previous years but still among the worst globally. China has also historically dominated global rankings of poor air quality, although recent clean air policies have improved air quality in the country.
The lack of monitoring stations in many countries in Africa, South America, and the Middle East has resulted in a dearth of air quality data, making it difficult to fully understand the extent of the problem. However, it is clear that air pollution is a significant issue that requires urgent attention and action from governments, communities, and other stakeholders to implement green initiatives and improve air quality worldwide.
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Bahrain: PM2.5 levels fluctuated from 59.8 in 2018 to 66.6 in 2022
PM2.5 refers to fine particulate matter that is 2.5 microns or less in diameter. These particles are considered air pollutants and can have detrimental health effects when present in high concentrations. According to the World Health Organization (WHO), around 24% of global deaths (approximately 13.6 million) are attributed to environmental factors, with exposure to PM2.5 being a causal factor in 25% of these deaths.
In Bahrain, PM2.5 levels have fluctuated in recent years, with a concentration of 59.8 in 2018, a decrease to 39.7 in 2020, and then a significant spike to 66.6 in 2022. These fluctuations are influenced by various factors, including industrial emissions, heavy traffic, and regional dust storms. Bahrain's economy is heavily reliant on the petroleum industry, which is a significant contributor to air pollution. The capital, Manama, is often shrouded in smog, exemplifying the country's ongoing struggle with air quality management.
The health impacts of PM2.5 in Bahrain have been studied, and it is recognized that exposure to ambient PM2.5 is linked to respiratory infections, lung cancer, chronic obstructive pulmonary disease, stroke, ischemic heart disease, and type 2 diabetes. Efforts to raise public awareness about air quality and encourage the adoption of self-protective measures during periods of poor air quality are crucial.
The Bahraini government and environmental organizations are working to address the country's air quality issues. However, the complex nature of the problem, influenced by industrial and economic factors, presents significant challenges. It is important for Bahrain to continue monitoring and implementing strategies to reduce PM2.5 levels and protect the health and well-being of its citizens.
While Bahrain has made some progress in addressing air pollution, the fluctuations in PM2.5 levels from 2018 to 2022 highlight the dynamic nature of the issue and the need for sustained efforts to improve air quality in the country.
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Bangladesh: Despite improvements, Bangladesh still ranks among the worst globally
Bangladesh has made some progress in improving its air quality in recent years, but it still ranks among the worst globally. In 2018, the country had the highest PM2.5 concentration globally at 97.1, which gradually decreased to 65.8 in 2022. While this drop indicates progress, the air quality in Dhaka, the capital city, and other urban areas remains extremely poor.
The severe air pollution in Bangladesh has far-reaching consequences for its people, economy, and environment. Fine particulate air pollution (PM2.5) shortens the average life expectancy of Bangladeshi residents by 6.8 years compared to the World Health Organization's (WHO) guideline of 5 µg/m³. Certain areas, such as Gazipur, fare even worse, with air pollution reducing life expectancy by 8.3 years. The high levels of PM2.5 in Bangladesh primarily arise from vehicular emissions, industrial discharges, and the extensive use of kilns for brick-making. Additionally, dust accumulation in cities, resulting from various sources, contributes significantly to the country's air quality issues.
Bangladesh's poor air quality is disproportionately high compared to its overall carbon footprint. The country contributes less than 1% of global carbon emissions, yet its cities, particularly Dhaka, consistently rank among the worst in terms of AQI scores. The energy mix in Bangladesh consists of natural gas (59%), oil (31%), and coal (10%), with a negligible contribution from renewables. The competition between coal and natural gas usage significantly impacts the country's air quality. While natural gas emits carbon dioxide, it generates far fewer particulates than coal. Studies suggest that transitioning from coal to gas could drastically reduce harmful emissions of sulfur dioxide and nitric oxide, offering a viable path towards improving Bangladesh's air quality.
To address its severe air quality crisis, Bangladesh needs to balance growth, sustainability, and energy access. Adopting cleaner fuels, implementing new regulations, and strengthening regional energy integration can be beneficial in the long term. Additionally, improving the availability and accessibility of timely and reliable air quality data can empower Bangladeshi citizens to actively participate in tackling air pollution. While the country faces profound challenges in transitioning to a safer and more equitable energy system, taking these steps can help enhance the well-being of its population.
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Iraq: Pollution has sharply increased due to industrial growth and traffic congestion
Several countries are facing critical air pollution levels, with Chad topping the list in 2022. Other countries with significant air pollution include Bahrain and Bangladesh.
Iraq is among the countries grappling with severe air pollution, and this can be attributed to various factors, primarily industrial growth and traffic congestion. The former has resulted in increased emissions from factories and power plants, contributing to the overall degradation of air quality. However, the latter, traffic congestion, is a more pressing concern.
Traffic congestion in Iraq has intensified due to the surge in private car ownership. The country's abundance of oil resources has made gasoline and diesel fuel relatively inexpensive, making car ownership more accessible. Additionally, the inefficiency and inadequacy of public transportation systems have further encouraged the preference for private vehicles. This has resulted in a significant increase in the number of cars on Iraqi roads, leading to congested streets and low vehicle speeds.
The slow-moving automobiles, particularly those with internal combustion engines, emit substantial amounts of greenhouse gases, especially carbon dioxide. The combustion of gasoline and diesel fuel contributes to higher emissions of harmful pollutants. Furthermore, the lack of adequate road infrastructure and the government's neglect of this sector have exacerbated the congestion issues.
To address the air pollution crisis in Iraq, reducing traffic congestion is imperative. This can be achieved through various measures, such as investing in infrastructure development, including the construction of subways and trains, as well as expanding and improving roads. Additionally, legislative actions, such as implementing congestion taxes and regulations on emissions, can help limit the number of private cars on the roads and reduce greenhouse gas emissions. By implementing these solutions, Iraq can effectively reduce traffic congestion and, consequently, improve its air quality.
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Frequently asked questions
The countries with the most polluted air are primarily found in Africa and South Asia. In 2022, Chad was the most polluted country in terms of PM2.5 concentration, with other countries like Bahrain, Bangladesh, and China also ranking highly.
PM2.5 refers to fine particulate matter that is 2.5 microns or less in diameter. These particles are considered inhalable and pose significant health risks, especially when present in high concentrations.
Air pollution is primarily caused by the burning of fossil fuels, with vehicles, power plants, and factories being the largest contributors. Industrial emissions, heavy traffic, biomass burning, and regional dust storms also play a significant role in air pollution.
