Bronte Wells
Air pollution has become a pressing global issue, with 99% of the world's population breathing unsafe air. It is one of the biggest health problems of modern industrial society, causing millions of deaths per year and driving climate change. While the most polluted countries are often those with the highest emissions, this is not always the case, as some less polluted countries are responsible for detrimental air quality impacts elsewhere. Various factors contribute to air pollution, including industrial emissions, traffic pollution, and the burning of garbage, plastic, and fossil fuels. Water pollution, caused primarily by sewage contamination, also poses significant challenges, affecting access to clean drinking water. The Central African Republic, for instance, has the most polluted water globally, with 70% of its population lacking access to clean drinking water. India, on the other hand, ranks second in air pollution, with 1.7 million premature deaths attributed to it in 2019. Bangladesh, Chad, and Pakistan are also among the world's most polluted countries.
| Characteristics | Values |
|---|---|
| Continent with the most polluted countries | Africa, Asia |
| Countries with the highest air pollution levels | Bangladesh, Chad, Pakistan, China, Kyrgyzstan, Ethiopia, Armenia, Iran, Uzbekistan, Bosnia and Herzegovina, Nigeria, Uganda, Nepal, Saudi Arabia, Qatar, Rwanda, Sudan, United Arab Emirates, Tajikistan, Egypt, India, Kuwait, Burkina Faso, Bahrain |
| Recommended limit of particulate matter pollution | 10 micrograms per cubic meter |
| World Health Organization's data on India | 14 out of the world's 15 most contaminated cities are in India |
| World Health Organization's data on premature deaths | Air pollution caused nearly 4.5 million premature deaths in 2019 |
| Countries with successful public transport programmes | Colombia, Indonesia |
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What You'll Learn
Bangladesh, Chad and Pakistan are the world's most polluted countries
Air pollution is a pressing global issue, with 99% of the world's population breathing unsafe air. It is among the biggest health problems of modern industrial society, affecting nearly every organ and system in the body and causing respiratory and cardiovascular illnesses, reducing life expectancy, and leading to nearly 4.5 million premature deaths in 2019.
Bangladesh, Chad, and Pakistan are consistently ranked among the most polluted countries in the world. According to IQAir's recent ranking, Chad tops the list, with a staggering PM2.5 concentration of 91.8 μg/m³, followed by Bangladesh and Pakistan. These countries face significant challenges due to industrial emissions, agricultural burning, vehicle pollution, and dust, among other factors.
Bangladesh has led the table of the most polluted countries since 2018, with emissions higher than the previous years, posing a severe threat to the health of its citizens. Chad, which returned to the rankings in 2024 after being excluded in 2023 for lack of data, faces critical air quality issues due to industrial emissions and desert dust storms. Pakistan, ranking third, struggles with pollution stemming from crop burning, vehicular emissions, and industrial waste.
The high levels of pollution in these countries can be attributed to various economic activities, geographical conditions, and insufficient pollution control measures. It is important to note that the world's most polluted countries are not always the biggest polluters, as some less polluted countries can have a detrimental impact on the air quality of other regions. Transboundary air pollution is a serious issue, and it requires regional international collaboration to address effectively.
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India has the second-worst air pollution
Air pollution has become a pressing global issue, with emerging and developing countries struggling to meet international environmental standards. While some of the least-polluted countries are responsible for detrimental air quality in other places, it is Bangladesh, Chad, and Pakistan that are currently the world's most polluted countries.
India is the world's second-most polluted country. In 2019, 21 out of the 30 most polluted cities were in India. The air quality in New Delhi, India's capital, is particularly poor. In 2014, the World Health Organization deemed it the most polluted city in the world. The air quality index of New Delhi dropped into the "severe-plus category" when it reached 574, and in 2024, it was ranked as the world's most polluted city with air quality at a hazardous 1,081. The air pollution in Delhi has been described as the worst in the world for several years, with the situation worsening after the Diwali celebrations due to the use of illegal firecrackers. The city's air quality is monitored by India's Central Pollution Control Board, which routinely monitors four air pollutants: sulphur dioxide (SO2), oxides of nitrogen (NOx), suspended particulate matter (SPM), and respirable particulate matter (PM10).
The air pollution in India has severe health implications for its residents. Indians have 30% weaker lung function than Europeans, and a doctor from Delhi reported that his patients with lung cancer now include non-smokers, with around 40% being female. Moreover, patients are getting younger, with around 10% in their 30s and 40s. Chronic obstructive pulmonary disease (COPD) is now the second-largest cause of death in India, after heart disease. Fine particulate air pollution (PM2.5) shortens an average Indian's life expectancy by 5.3 years, and in the National Capital Territory of Delhi, lives are shortened by 11.9 years. Over 2 million Indians lose their lives due to air pollution each year.
India's air pollution is caused primarily by industrial and vehicular emissions, construction dust and debris, thermal power dependence, waste burning, and the use of wood and dung for cooking and heating in low-income and rural households. The country's geographical location and proximity to the Himalayas also make it difficult for polluted air to escape, especially during the winter months when wind strength is reduced. In 2019, the Indian government launched the National Clean Air Program (NCAP) to address this issue, aiming to reduce air pollution levels by 20-30% by 2024 in 122 of the worst-affected cities. The government has also announced a revamped particulate pollution reduction target for NCAP, increasing the number of target cities to 131 and setting a 40% reduction goal by 2025-2026.
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Madagascar has the fifth-most polluted water
Air pollution has become a pressing global issue, with 99% of the world's population breathing unsafe air. While some countries are far more polluted than others, the world's most polluted countries are not always the ones that are the most polluting.
Madagascar, the second-largest island country in the world, has the fifth-most polluted water. The nation's water pollution is primarily caused by sewage running into the drinking supply, with only 31% of people in rural regions having access to pure drinking water. The biggest problem is the lack of infrastructure; only 20% of the population has piped sewage, meaning the rest use open sewage systems to dispose of waste. Poor waste management and accumulating piles of pollutants poison the rivers and water, with solid waste from urban regions and pollutants from unregulated industries flowing into the water.
The country also faces issues with water contamination, with deforestation and erosion causing rivers to become contaminated with mud from landslides and sediment from forest-cleared fields. The introduction of IT and increased use of electronic devices has also led to e-waste polluting the sewage and water. The government's lack of infrastructure and poor waste management systems mean that sustainability in Madagascar may become unreachable.
The water pollution in Madagascar has severe health implications for its residents. Many are forced to drink contaminated water, exposing themselves to diseases and health issues. International organizations such as the International Development Association (IDA) and the Water & Sanitation for the Urban Poor (WSUP) have provided support, but there is still much work to be done to provide sanitary water to the nation's people.
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China has less than half the pollution of Bangladesh
While China and Bangladesh are among the countries with the worst air pollution, China's pollution levels are significantly lower than those of Bangladesh. In fact, China has less than half the pollution of Bangladesh. According to IQAir, Bangladesh is the world's most polluted country, with a PM2.5 reading of 83.30 μg/m³ in 2019, far exceeding the World Health Organization's recommended limit of 10 micrograms per cubic meter. China, on the other hand, has a pollution measurement of 32.5µg/m³.
Bangladesh's poor air quality is attributed to several factors, including its growing use of fossil fuels, vehicle emissions, and a lack of regulations regarding engine standards. The country's economic growth and population boom have also contributed to increased pollution levels. While nuclear energy has been pursued as a solution, with Russia's assistance, it has come at a high financial cost. Additionally, Bangladesh's proximity to other polluted countries, such as India, Nepal, and China, further exacerbates its pollution challenges.
China, despite having over 1 billion more people than Bangladesh, has taken steps to improve its air quality. For example, Beijing implemented restrictions on vehicle usage during the 2008 Summer Olympics, and the greater uptake of natural gas has helped reduce urban air pollution. However, China's consumption of commercial solid coal fuels and contribution to greenhouse gas emissions remain significant, impacting not only its own air quality but also that of neighboring countries.
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 contribute to detrimental air quality in other regions. Nonetheless, both China and Bangladesh face ongoing challenges in reducing their pollution levels and mitigating their impact on the environment and public health.
While China has less than half the pollution of Bangladesh, it is worth acknowledging that both countries are taking steps to address their pollution issues, and collaboration among nations is crucial for effective global emissions reduction and the improvement of air quality worldwide.
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Cape Verde, the Caribbean Netherlands and Finland are the least polluted
According to a ranking, Bangladesh, Chad, and Pakistan are the most polluted countries in the world. The least polluted countries are Cape Verde, the Caribbean Netherlands, and Finland.
Cape Verde
Cape Verde is an island country in West Africa. The country has good air quality, and air pollution poses little or no risk to its inhabitants.
Caribbean Netherlands
The Caribbean Netherlands, which includes the islands of Bonaire, Sint Eustatius, and Saba, has a good Air Quality Index (AQI) level. The AQI is often in the good range, indicating that the air quality is satisfactory and that residents can enjoy outdoor activities without worrying about air pollution.
Finland
Finland, a country in Northern Europe, is known for its generally good air quality. The country actively monitors and regulates air pollutant emissions, and information about air quality is readily available to the public. Finnish authorities maintain air pollutant emission inventories and adhere to international conventions such as the UNECE Long-Range Transboundary Air Pollution Convention (CLRTAP) and the EU National Emissions Ceilings Directive (NECD).
While these three countries are the least polluted according to some sources, other sources suggest that the least polluted countries are territories and islands with small populations, such as French Polynesia, Mauritius, and Iceland.
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Frequently asked questions
While there is no clear answer as to which continent is the most polluted, Asia is home to some of the world's most polluted countries, including India, Bangladesh, and China.
According to IQAir, Bangladesh is the world's most polluted country, with Chad and Pakistan following closely behind.
The Central African Republic (CAR) has the most polluted water on Earth, with Madagascar coming in second.
Water pollution is often caused by sewage running into the drinking supply, as well as industrial waste and agricultural runoff.
Air pollution can affect nearly every organ and system in the human body and is responsible for more than 10% of all deaths worldwide, causing millions of premature deaths each year.
