Helena Joyce
Pollution is the main driver of climate change and is responsible for millions of deaths per year. While many countries are far more polluted than others, the world's most polluted countries are not always those that are the most polluting. According to IQAir, Bangladesh, Chad, and Pakistan are the world's most polluted countries, with fourteen out of the world's fifteen most contaminated cities located in India. This article will explore the countries most affected by pollution and the sources and consequences of this pollution.
| Characteristics | Values |
|---|---|
| Continent with the most polluted cities | Asia |
| Number of cities in Asia with the worst air pollution | 100 |
| Region with the worst performing air pollution levels | Central and South Asia |
| Number of countries in Central and South Asia with the worst air pollution levels | 4 |
| Countries in Central and South Asia with the worst air pollution levels | Bangladesh, Pakistan, India, and Tajikistan |
| Number of cities in India with the worst air pollution levels | 29 out of 30 |
| Cities in India with the worst air pollution levels | Lahore, New Delhi, and Dhaka |
| Country with the worst air pollution levels in 2022 | Bangladesh |
| Countries with the worst air pollution levels in 2022 | Pakistan, India, Tajikistan, Burkina Faso, and Iraq |
| Number of cities in the world with air quality meeting WHO standards | 9% of 7,800 cities |
| Annual mean PM2.5 concentration limit recommended by WHO | 10 micrograms (μg) per m³ |
| India's annual mean PM2.5 concentration | 91 μg/m³ |
| Country with the fifth-most polluted water and eighth-most polluted air | Madagascar |
| Country with the second-worst air pollution | India |
| Country with the worst air pollution in Africa | Nigeria |
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What You'll Learn
Most polluted countries
Asia is the world's most polluted continent, with all but one of the 100 cities with the worst air pollution in 2023 located there. Central and South Asia were the worst-performing regions, with all four of the most polluted countries located in this region: Bangladesh, Pakistan, India, and Tajikistan. South Asia is of particular concern, with 29 of the 30 most polluted cities located in India, Pakistan, or Bangladesh. India is the most polluted country in the world, with the second-worst air pollution, the fifth-worst light pollution, and the 16th-worst water pollution. The annual mean PM2.5 concentration in India is 91 μg/m³, far exceeding the World Health Organization's (WHO) recommended limit of 10 μg/m³.
Bangladesh has been ranked as the world's most polluted country in recent rankings, with Pakistan, India, and Tajikistan close behind. Bangladesh has consistently ranked among the most polluted countries since 2018, and while its emissions have decreased, they have not been significant enough to halt the climate crisis and protect the health of its citizens. Poorer, larger countries tend to be higher on the list of most polluted countries due to a lack of infrastructure for air quality improvement and older, more emission-intensive vehicles.
India, in particular, stands out for its alarming levels of pollution. The country has six of the ten most polluted cities in the world, and fourteen of the world's fifteen most contaminated cities. India's air quality has been severely impacted by the burning of fossil fuels, with the country ranking third in terms of air pollution. India's neighbour, Madagascar, also suffers from severe pollution, ranking fifth for water pollution and eighth for air pollution.
While not in Asia, Nigeria has also been identified as one of the most polluted countries, with significant air, light, and water pollution affecting its 200 million citizens. Lagos, Nigeria's largest city, has alarmingly high levels of air pollution, contributing to 11,200 premature deaths. The main sources of pollution in Lagos are road transport, industrial emissions, and large diesel generators that run on outdated fuels.
It is important to note that the world's most polluted countries are not always the ones that pollute the most. Some less polluted countries negatively impact the air quality of other regions. Additionally, the climate crisis exacerbates the problem, leading to more severe wildfires and longer pollen seasons, which further contribute to health issues associated with air pollution.
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Air pollution
Central and South Asia have been identified as the worst-performing regions for air quality, with all four of the most polluted countries located in this region: Bangladesh, Pakistan, India, and Tajikistan. South Asia is of particular concern, with 29 of the 30 most polluted cities spread across India, Pakistan, and Bangladesh. The report ranks Lahore in 5th place and New Delhi in 6th for air pollution. India, in particular, stands out as the most polluted country in the world, with the second-worst air pollution levels and the sixth-worst city for air pollution in New Delhi.
Other regions, such as North Africa, the Middle East, and the Indian subcontinent, also experience high levels of air pollution. Countries like Nigeria, Uganda, and Ethiopia are among those facing significant air quality issues. Additionally, North America has been impacted by severe wildfires, which have contributed to increased air pollution in cities like Minneapolis and Detroit.
The primary sources of air pollution vary across regions. In some areas, road transport, industrial emissions, and the use of outdated fuels contribute significantly to air pollution. Open waste burning, illegal dumping, and the burning of fossil fuels further exacerbate the problem. In other regions, such as Madagascar, poorly regulated vehicle emissions, unregulated industrial emissions, and heavy reliance on solid biomass for cooking result in heavy smog and air pollution.
The health consequences of air pollution are severe and irreversible. According to IQAir Global CEO Frank Hammes, air pollution can reduce life expectancy by three to six years and lead to preventable suffering. Microscopic particulate matter (PM2.5) is considered the most dangerous pollutant, as it can reach deep into lung tissue and enter the bloodstream when inhaled. PM2.5 has been linked to asthma, heart and lung disease, cancer, respiratory illnesses, and cognitive impairment in children.
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Water pollution
Asia is the world's most polluted continent, with all but one of the 100 cities with the worst air pollution in 2023 located in Asia, according to a report. Central and South Asia were the worst-performing regions, with Bangladesh, Pakistan, India, and Tajikistan being the four most polluted countries. South Asia is of particular concern, with 29 of the 30 most polluted cities in India, Pakistan, or Bangladesh.
Now, focusing on water pollution specifically, it is worth noting that water quality is influenced by both natural and man-made factors and varies significantly across countries. While water accessibility is improving globally, billions of people still lack easy access to clean drinking water. In 2022, more than a quarter of the world's population, or 2.2 billion people, did not have safe and easy access to clean drinking water, according to UNICEF.
One of the most respected aggregators of water quality data is Yale University's Environmental Performance Index (EPI), which tracks 40 performance indicators, including "Sanitation & Drinking Water." The EPI measures water quality using the DALY (Disability-Adjusted Life Years) scale, where a score of 100 indicates the purest and least contaminated water, and a score of 0 indicates the 5% of countries with the most contaminated water.
Several countries in Africa, such as Chad, Ethiopia, and Niger, face significant challenges in providing their populations with access to clean drinking water. For instance, in Chad, only one in two children has access to clean drinking water, and only one in ten has improved sanitation. Similarly, Ethiopia's northern highlands experience severe droughts, emphasizing the urgency of sustainable water supply delivery. In West Africa, Niger is among the worst for water access, with over 40% of its population living on less than $2.15 per day and struggling with water shortages and frequent droughts.
Additionally, in East Africa, Eritrea has made notable improvements in providing access to clean water and sanitation for communities. However, issues such as deforestation and poor farming practices continue to exacerbate water pollution in the region. Mozambique, Angola, and Somalia are also mentioned as facing challenges in providing their rural populations with access to clean water and sanitation.
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Light pollution
Asia is the most polluted continent, with all but one of the 100 cities with the worst air pollution in the world. Central and South Asia are the worst-performing regions, with Bangladesh, Pakistan, India, and Tajikistan being the four most polluted countries. India alone is home to 14 of the 15 most contaminated cities globally.
Now, here is some detailed information about light pollution:
The adverse consequences of light pollution are multiple and impact humans, wildlife, and the environment. One of the most noticeable effects is the reduction in the visibility of stars and galaxies in the night sky, which is a significant concern for astronomers. Light pollution disrupts ecosystems, interferes with the natural body rhythms of both humans and animals, wastes energy, and increases the impacts of climate change. It has also been linked to adverse health effects in humans, including sleep deprivation, fatigue, headaches, stress, anxiety, and other health problems.
Some of the most light-polluted countries in the world include Singapore, Qatar, and Kuwait. However, it's important to note that light pollution is not limited to highly industrialized or densely populated areas. Even relatively small amounts of light in remote or dark environments can create problems and be perceived at longer distances.
There have been efforts to reduce light pollution, with one of the first coordinated legislative initiatives taking place in Flagstaff, Arizona, where more than three decades of ordinance development has occurred with community support and the help of local observatories. Other exceptions to the rapid light pollution growth rate include portions of Northern Italy and Tucson, Arizona, where lighting regulations have been enforced.
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Health consequences
Air pollution poses a significant threat to global health, with 99% of people worldwide breathing unsafe air. The climate crisis is causing more severe wildfires and longer, more intense pollen seasons, which exacerbate health issues linked to air pollution. The health consequences of air pollution are widespread and detrimental, with fine particulate matter (PM2.5) being the most dangerous pollutant. PM2.5 is produced by the combustion of fossil fuels, dust storms, and wildfires, and it can lead to asthma, heart and lung disease, cancer, respiratory illnesses, and cognitive impairment in children. Exposure to PM2.5 is linked to a reduction in life expectancy by 3 to 6 years and an increase in infant mortality rates. The burden of air pollution is particularly high in Africa, with particulate matter pollution being the leading risk factor for deaths across the continent. Northern Africa has the highest disease burden related to PM2.5, while Eastern Africa has the lowest. The death rate linked to air pollution in Africa is almost double the global average, with Egypt having the highest number of deaths attributable to PM2.5 in 2019.
Central and South Asia are also highly polluted regions, with Bangladesh, Pakistan, India, and Tajikistan being the four most polluted countries in the world. South Asia is of particular concern, with 29 of the 30 most polluted cities located in India, Pakistan, or Bangladesh. The major population centers of Lahore, New Delhi, and Dhaka are among the most polluted cities in the world. The high levels of pollution in these regions are due to factors such as dirty fuel use, fossil fuel combustion, and agricultural practices. The health consequences of air pollution in Asia are severe, with billions of people at risk of respiratory illnesses, heart and lung disease, and other health issues.
Urbanization and population growth contribute to higher traffic congestion and energy consumption, which lead to increased air pollution and impede population health. In highly populated countries, such as China, the growth of the industrial and commercial sectors has led to constant red alerts for environmental pollution in cities like Beijing. While China has led important initiatives to combat climate change, the majority of these have been insufficient in improving air quality. Fourteen out of the world's 15 most contaminated cities are in India, according to the World Health Organization. India's burning of fossil fuels has significantly contributed to its high pollution levels.
To mitigate the health risks associated with air pollution, targeted public health policies and stringent environmental regulations are necessary. Regional interventions, effective healthcare planning, comprehensive public awareness campaigns, and international cooperation are crucial in reducing the adverse effects of air pollution on health. Addressing the sources of air pollution, such as residential fuel use, fossil fuel use, transportation, industry, and waste burning, is essential for improving air quality and protecting the health of populations worldwide.
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Frequently asked questions
While sources do not refer to continents, the most polluted countries in the world are Bangladesh, Chad, Pakistan, India, Tajikistan, Burkina Faso, and Iraq.
India is reported to have the most polluted water in the world. Madagascar has the fifth-most polluted water, and Nigeria is reported to have the third-most polluted water.
Lagos, Nigeria, is one of the most polluted cities in the world, with 11,200 premature deaths attributed to air pollution. Fourteen of the world's 15 most contaminated cities are in India.
