Meghan Hodges
The world's most polluted countries are not always the most polluting. While the least polluted countries are often responsible for detrimental air quality in other places, the most polluted countries are taking steps to reduce emissions. China, the United States, India, the European Union, and Germany are the most polluting countries by CO2 emissions. However, per capita, the average American is responsible for twice as much pollution as the average person in China, and India's emissions are significantly below the global average. Countries like Colombia and Indonesia have enacted public transport programmes to reduce emissions, and companies are turning to projects like U-Earth's Pure Air Zone, which uses bacteria and enzymes to capture and neutralise air contaminants.
| Characteristics | Values |
|---|---|
| Countries with the highest CO2 emissions | China, the United States, and India |
| China's CO2 emissions (in billion tonnes) | 9.9 |
| United States' CO2 emissions (in billion tonnes) | 4.4 |
| India's CO2 emissions (in billion tonnes) | 2.3 |
| Country with the highest CO2 emissions in Europe | Germany |
| Countries with the highest per capita CO2 emissions | United States, followed by China |
| Countries with the highest CO2 emissions in 2023 | China, the United States, India, EU27, Russia, and Brazil |
| Countries with the highest planet-heating pollution | China, India, the United States, and the European Union |
| Country with the highest number of contaminated cities | India |
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What You'll Learn
China's emissions
China, formally known as the People's Republic of China, is the world's second-largest economy, the second most populous country, and the world's largest socialist state. China has been the world's largest annual emitter of greenhouse gases since 2006, and its citizens now have carbon footprints well above the global average. China emitted 9.9 billion tonnes of CO2 in 2022, largely due to the export of consumer goods and its heavy reliance on coal. China is home to half of the world's coal power plants and is the world's fifth-largest oil producer and second-largest consumer.
China's per capita emissions correspond to over 10.1 tonnes of CO2 emitted per person each year, which is over the world average and the EU average. However, China's cumulative and per capita emissions remain about half of the US's today. In 2020, China's leader, Xi Jinping, pledged to "peak carbon dioxide emissions before 2030" and "achieve carbon neutrality before 2060". China has been participating in international climate negotiations under the United Nations Framework Convention on Climate Change (UNFCCC) since the early 1990s.
China experienced the largest increase in emissions in 2023, with a net increase of approximately 565 million tonnes, according to the International Energy Agency. This was exacerbated by a historic decrease in hydropower, pushing its per capita emissions 15% higher than those in advanced economies. However, in 2024, China recorded a 3% decrease in greenhouse gas emissions compared to the previous year, mainly due to an expansion in wind and solar power capacities.
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India's air quality
India is one of the most polluted countries in the world. In 2019, 21 out of the 30 most polluted cities were in India, pushing India's ranking as a country to fifth place. Fourteen out of the world's 15 most contaminated cities are in India, according to the World Health Organization.
India has had a law protecting air quality since the 1980s, but the burning of fossil fuels has grown significantly, and India now ranks as the world's third-greatest producer of greenhouse gases. The country's large cities and towns suffer from traffic congestion, with a lack of intra-city divided highways and poor enforcement of traffic laws. As a result, traffic remains at a standstill, with idling engines contributing to poor air quality.
Over 50% of India's pollution comes from industry, followed by 27% from vehicles, 17% from crop burning, and 7% from domestic cooking. The fuel used for domestic cooking and heating is typically made from a mixture of wood, dried leaves, hay, and dried animal dung. When burned, this produces smoke and other pollutants five times higher than burning coal.
The Indian government has taken steps to address air pollution, launching the National Clean Air Program to reduce particulate matter pollution by 30% by 2024, with a revised target of 40% by 2026. The Clean Air Fund works with the government, businesses, and the public to help India reach its clean air goals, and the Confederation of Indian Industry has developed a Corporate Air Emissions Reporting Guide to help businesses manage and report their emissions.
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US climate policies
The United States is one of the world's top three most polluting countries, along with China and India. The US has 4.4 billion tonnes of CO2 emissions, largely due to its electricity, transportation, buildings, industry, and agriculture, forestry and land use sectors.
Climate change policy in the US is developed at the state and federal levels of government. The US Environmental Protection Agency (EPA) defines climate change as "any significant change in the measures of climate lasting for an extended period of time". This includes major changes in temperature, precipitation, or wind patterns, as well as other effects that occur over several decades or longer.
The US has taken some steps to address climate change and reduce its emissions. For example, in 2009, President Obama established the White House Office of Energy and Climate Change Policy, and appointed Carol Browner as Assistant to the President for Energy and Climate Change. In 2016, the administration released an Information Collection Request (ICR), requiring all methane-emitting operations to provide emission levels reports to EPA analysts. New standards set emission limits for methane and encouraged the transition to newer and cleaner production equipment.
The US has also committed to the Paris Climate Agreement, which aims to avoid a 2ºC increase in global temperature by the end of the century through the drastic reduction of CO2 emissions. The US has set ambitious new targets to cut overall greenhouse gas emissions by 61-66% by 2035 relative to 2005 levels, achieve a 50% electric vehicle sales share by 2030, and a net-zero emissions economy by 2050. The Inflation Reduction Act of 2022 has also mobilised historic levels of investment in clean energy solutions and activated non-state action on climate change.
However, the US has been criticised for not doing enough to meet its climate goals. For example, the US has not developed or implemented any regulations to address emissions from animal production or encouraged dietary change, despite having one of the highest rates of meat and dairy consumption in the world. Additionally, the US has been criticised for not providing enough financial support to other countries to reduce their emissions.
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EU's carbon leakage
The countries with the highest carbon dioxide emissions are China, the United States, and India. China emits 9.9 billion tonnes of CO2, largely due to its export market and heavy reliance on coal. The US emits 4.4 billion tonnes, and India 2.3 billion tonnes. Germany is the European country with the highest emissions, contributing over a quarter of the EU's total CO2 emissions.
Carbon leakage is a phenomenon that occurs when industries relocate to avoid stringent climate policies, increasing emissions in regions with weaker environmental regulations. This can lead to a net increase in global emissions, offsetting any reductions achieved through climate regulations. Carbon leakage is particularly prevalent in energy-intensive industries, such as steel and cement manufacturing, which face intense global competition. These sectors may relocate to countries with lower labour and energy costs to maintain their cost competitiveness.
The EU has recognised the risk of carbon leakage within its Emissions Trading System (EU ETS) and has implemented measures to address it. Under the EU ETS, industrial installations at risk of carbon leakage receive special treatment to support their competitiveness. Highly exposed sectors placed on the carbon leakage list receive allowances equivalent to 100% of the relevant benchmark for free. The list is drawn up by the European Commission with the agreement of Member States and the European Parliament, following an impact assessment and consultation with stakeholders.
To further mitigate carbon leakage, the EU introduced the Carbon Border Adjustment Mechanism (CBAM) in 2023. CBAM imposes carbon pricing on imports to prevent unfair competition and incentivize global climate policy alignment. It aims to reduce carbon leakage and promote responsible investment. The implementation of CBAM is expected to reduce carbon leakage by 19%.
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UAE's pollution increase
The discovery of oil in the late 20th century transformed the UAE from a quiet region of small fishing and pearl-diving communities into a rapidly industrializing economy. This growth has had significant environmental repercussions, and air pollution in the UAE has become a rising concern. The UAE's economy is heavily reliant on the oil and gas industry, which is a significant contributor to the nation's air pollution. Activities such as extraction, refining, and burning fossil fuels release pollutants such as sulphur dioxide, nitrogen dioxide, and particulate matter, all of which have detrimental effects on air quality.
The construction industry, integral to the UAE's urbanization, is another major polluter. The rapid growth and urbanization in the UAE have led to an increase in construction activities, which contribute to airborne dust and particulate matter. Additionally, urbanization has resulted in an increased demand for energy, with power plants burning fossil fuels to meet this demand and further increasing pollution levels. The UAE's geographical location also plays a role, as natural elements like dust and sandstorms add to the overall air pollution.
The high levels of air pollution in the UAE have had a significant impact on public health. Respiratory diseases, such as asthma and chronic obstructive pulmonary disease, have become more prevalent, and long-term exposure to polluted air contributes to cardiovascular diseases and lung cancer. Particulate matter and other pollutants can also exacerbate existing health conditions and negatively affect the elderly, children, and vulnerable populations.
Despite being one of the world's largest oil producers and having plans to increase fossil fuel production, the UAE government has demonstrated a commitment to addressing environmental issues. They have submitted a revised nationally determined contribution with stronger emissions reduction targets and are investing significantly in renewable energy sources. However, organizations like Climate Action Tracker have criticized the lack of action in the real economy, giving the country an "insufficient" rating.
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Frequently asked questions
The countries with the highest carbon dioxide emissions are China, the United States, India, Germany, and Saudi Arabia.
Bangladesh, Chad, Pakistan, and the United Arab Emirates are among the most polluted countries in the world.
French Polynesia, Mauritius, Iceland, Cape Verde, and the Caribbean Netherlands are some of the least polluted countries.
Human activity is one of the main causes of global warming due to its high greenhouse gas emissions. The burning of fossil fuels, the generation of energy through non-renewable sources, and other polluting human activities are significant contributors.
Legislative initiatives such as the Carbon Border Adjustment Mechanism (CBAM) in Europe and the Inflation Act in the United States aim to address carbon leakage concerns and promote sustainable practices.
