Helena Joyce
The most polluted countries in the world are ranked according to their average measured concentration of particulate matter (PM2.5) in micrograms per cubic meter (μg/m3). The World Health Organization's recommended limit is 10 micrograms per cubic meter. However, there are also various national guideline values, which are often much higher. The three countries with the highest carbon dioxide (CO2) emissions are China, the United States, and India. However, when it comes to emissions per capita, the three most polluting countries are located on the Arabian Peninsula due to their large share in the oil industry and small populations.
| Characteristics | Values |
|---|---|
| Date of Data | 2021-2025 |
| Data Source | IQAir |
| Number of Data Points | 8,000 |
| Country with Highest Pollution | Bangladesh |
| Bangladesh's Annual Average Concentration of PM 2.5 | 79.9 µg/m³ |
| Countries in Top Five | Pakistan, India, Tajikistan, Burkina Faso, Iraq |
| Least Polluted Countries | French Polynesia, Mauritius, Iceland |
| Least Polluted Areas | Territories and Islands with Small Populations |
| Countries with Highest CO2 Emissions | China, United States, India |
| European Country with Highest CO2 Emissions | Germany |
| Countries with Highest Pollution Per Capita | Located in Arabian Peninsula |
| World Health Organization's Recommended Limit for Average Measured Concentration of Particulate Matter (PM2.5) | 10 micrograms per cubic meter |
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What You'll Learn
Countries with the highest CO2 emissions
Several countries are notorious for their high CO2 emissions, which significantly contribute to global warming and climate change. Here is an overview of some of the countries with the highest CO2 emissions:
China
China has consistently ranked as the country with the highest CO2 emissions globally. In 2023, China was the world's largest emitter of greenhouse gases (GHG), which are primarily composed of carbon dioxide. While China's vast population influences its high emissions, its emissions per capita are still substantial. China's emissions are largely attributed to the burning of fossil fuels and cement manufacturing.
United States
The United States is another major contributor to global CO2 emissions. In 2023, the United States had the highest CO2 emissions per capita among the top emitting countries, indicating a significant emissions intensity. Despite some fluctuations, the country's overall emissions have been on an upward trajectory, with a notable increase in 2021 compared to 2020.
India
India is also among the top emitters of CO2 worldwide. In 2021, India experienced an increase in CO2 emissions per unit of GDP, and its contribution to global GHG emissions is considerable. India's emissions are largely driven by its industrial activities and a reliance on fossil fuels.
EU27
The collective emissions of the 27 member states of the European Union (EU27) place it among the top emitters. While the EU27's share of global emissions has decreased over the years, it still contributes significantly to global CO2 levels. In 2021, the EU27's total fossil CO2 emissions increased by 6.5% compared to the previous year, highlighting the ongoing challenges in reducing emissions.
Russia
Russia is another country with notable CO2 emissions. In 2021, Russia's CO2 emissions per unit of GDP increased by 3.1%, indicating a higher emissions intensity. Russia's cold climate and energy-intensive industries contribute to its high emissions, and it remains one of the world's largest emitters of GHGs.
These countries, along with others like Brazil and Japan, play a significant role in global CO2 emissions. It is important to address these emissions through international cooperation, policy interventions, and the adoption of cleaner technologies to mitigate climate change and improve air quality worldwide.
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Most polluted per capita
The World Health Organization (WHO) recommends a limit of 10 micrograms per cubic meter of average measured concentration of particulate matter (PM2.5). However, many countries exceed this limit, with air pollution being responsible for over 10% of deaths worldwide, according to The Lancet. Air pollution is a significant issue in developing countries, where environmental standards are often not met.
When it comes to per capita emissions, Russia and the United States are among the highest emitters. According to the UNEP's Emissions Gap Report 2024, Russia produced 19 tons of carbon dioxide equivalent (tCO2e) per person in 2023, while the US emitted 18 tCO2e. China, despite being the biggest single-country emitter of GHGs in total emissions, produced nearly half the per capita emissions of Russia and the US, at 11 tCO2e per capita.
Consumption-based emissions reflect the lifestyle choices and consumption patterns of a country's citizens. They are calculated by adjusting for trade, considering domestic emissions, and the emissions generated in exporting and importing goods and services. Positive values in the net import-export balance indicate net importers of CO2, while negative values represent net exporters.
While Russia and the US have the highest per capita emissions, China's total emissions output is a significant concern. As the second-biggest emitter, the US also plays a significant role in global emissions, with an 11% share of the global total in 2022. India, accounting for 8% of global emissions, is another major contributor.
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Ecological footprint
An ecological footprint is the pressure exerted on the planet to meet the needs of its population. This can be measured on a personal, national, or global scale. To determine whether a country is sustainable, its ecological footprint must be compared to its biocapacity, which is the supply side of the equation. Biocapacity measures the ability of a given area to generate renewable resources and absorb waste.
A country with an ecological footprint exceeding its biocapacity is said to have an ecological deficit and is termed an ecological debtor. Conversely, a country with a surplus is called a creditor. The world-average ecological footprint in 2016 was 2.75 global hectares per person, with a biocapacity of 1.63 global hectares per person, resulting in a global ecological deficit.
China, the United States, and India are consistently ranked as the top three most polluting countries in terms of carbon dioxide emissions. However, their ecological footprints differ. China has a biocapacity of 1.2 billion hectares, the third-largest globally, but its massive population results in a total ecological deficit of -3.9 billion gha. The United States has an ecological footprint of 7.8 gha per capita, one of the highest globally, with a biocapacity per capita of 3.7 hectares, resulting in a deficit of -1.4 billion hectares. India's total ecological footprint is 1.5 billion gha, the third highest, but its per capita footprint is 1.1, reflecting widespread poverty.
Singapore is another country with a notable ecological footprint, with its ecological impact 99.5 times the biocapacity of its territory.
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Particulate matter (PM2.5) concentration
Particulate matter, also known as PM2.5, refers to fine particles suspended in the air that are 2.5 microns or less in width—approximately 30 times smaller than the width of a human hair. These particles can include dust, soot, smoke, and liquid droplets and are often categorised as air pollution due to their harmful effects on human health and the environment.
PM2.5 pollution is measured in micrograms per cubic meter (μg/m3), and the World Health Organization (WHO) recommends a safe limit of 10 μg/m3. However, many countries exceed this limit, with outdoor air pollution posing a significant health risk to their populations. According to the Lancet, air pollution, including PM2.5, is responsible for over 10% of global deaths, amounting to nearly 4.5 million premature deaths in 2019 alone.
Regions with the highest PM2.5 exposures are Asia, Africa, and the Middle East. Within Asia, South Asia stands out for its persistently high PM2.5 levels, while countries in sub-Saharan Africa generally have the highest PM2.5 concentrations globally. Several factors contribute to these elevated levels, including industrial emissions, vehicle emissions, coal-burning power plants, and natural sources such as dust from the Sahara Desert, which affects countries in North Africa and the Middle East.
While less-developed countries tend to have higher PM2.5 concentrations, it is important to note that PM2.5 pollution can be carried long distances, impacting neighbouring countries regardless of their development status. Some regions, like Southeast Asia, East Asia, and Oceania, have made notable improvements in reducing PM2.5 levels, largely due to air quality controls in China. However, other regions, particularly in Africa and the Middle East, have experienced increases in PM2.5 exposures, underscoring the ongoing challenges in the battle against air pollution.
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Countries with the worst outdoor air quality
Air pollution is one of the biggest health problems of modern industrial society, causing nearly 4.5 million premature deaths in 2019, according to The Lancet. It can affect almost every organ and system in the human body and is also detrimental to nature. Air pollution is caused by both natural and man-made sources. Natural sources include windblown dust, dirt, sand, volcanic smoke, and burning materials. Man-made sources, which tend to be the leading cause of air pollution in cities, include combustion from transportation and industrial businesses, biomass burning, and agriculture.
The World Health Organization's (WHO) recommended limit of air pollution is 10 micrograms per cubic meter (μg/m³). However, in 2024, 91% of 138 countries and regions around the world exceeded the WHO's annual PM2.5 guideline value of 5 μg/m³. Central and South Asia were among the top ten most polluted regions in the world.
While it is challenging to pinpoint specific countries with the worst outdoor air quality, as air pollution levels can vary within a country, here are some insights based on available data:
- Countries in Central and South Asia: This region, which includes countries like India, Pakistan, and Bangladesh, consistently ranks among the most polluted in the world. Factors contributing to poor air quality include rapid industrialization, population density, and the burning of fossil fuels and biomass.
- China: China has well-documented issues with air pollution, particularly in its large cities. Heavy industrialization, vehicle emissions, and coal-fired power plants have all contributed to poor air quality.
- Middle Eastern Countries: Countries in the Middle East, such as Iran, Iraq, and Saudi Arabia, often experience high levels of air pollution due to dust storms, desertification, and oil-related industries.
- Sub-Saharan African Countries: Indoor and outdoor air pollution is a significant issue in many Sub-Saharan African countries, including Nigeria, Ethiopia, and South Africa. The reliance on biomass burning for cooking and heating, as well as industrial emissions and vehicle pollution, contribute to poor air quality.
- Industrialized Nations: Even some highly industrialized nations, such as the United States and certain countries in Europe, have areas with poor outdoor air quality. This is often due to high vehicle emissions, industrial activities, and power generation.
It is worth noting that air quality data may vary depending on the measurement methods, monitoring stations, and specific time frames. Additionally, air pollution levels can fluctuate due to seasonal changes, weather patterns, and temporary emissions control measures.
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Frequently asked questions
The most common ways to rank the most polluted countries are by CO2 emissions, per capita, ecological footprint, and average measured concentration of particulate matter (PM2.5).
The countries with the highest CO2 emissions are China, the United States, and India.
The three most polluting countries per capita are located in the Arabian Peninsula due to their large share in the oil industry and small populations.
Bangladesh is the world's most polluted country with 79.9 µg/m³, leading the table since 2018.
The top three least polluted countries are French Polynesia, Mauritius, and Iceland.
