Meghan Hodges
The countries with the highest carbon dioxide emissions are China, the United States, and India. However, when measured per capita, China's emissions are less than two-thirds of those of the United States and less than a sixth of those of Palau, the country with the highest per-capita emissions. China's high emissions are attributed to its export market and heavy reliance on coal, while the United States' emissions are also significant due to its industrialization. India, the world's most populous country, has seen fourteen of its provinces ranked among the world's 15 most contaminated cities by the World Health Organization. While India has laws to protect air quality, it has seen a significant increase in fossil fuel burning, contributing to its high emissions. These countries' emissions have severe consequences, with air pollution affecting nearly every organ and system in the human body and causing approximately 10% of global deaths, according to The Lancet.
| Characteristics | Values |
|---|---|
| Country with the most land borne pollution | China |
| Reason | Export of consumer goods and heavy reliance on coal |
| CO2 emissions in 2022 | 9.9 billion tonnes |
| Second most polluting country | The United States |
| CO2 emissions | 4.4 billion tonnes |
| Third most polluting country | India |
| CO2 emissions | 2.3 billion tonnes |
| European country with the highest CO2 emissions | Germany |
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What You'll Learn
China's CO2 emissions
China, the United States, and India are the three most industrialised countries in the world and, therefore, the countries with the highest carbon dioxide (CO2) emissions. China has been emitting more CO2 than any other country since 2006, with 9.9 billion tonnes of CO2 emissions. These high levels of pollution are largely due to China's export of consumer goods and its heavy reliance on coal.
There are signs that China's CO2 emissions could be reaching a peak and plateau or even a period of structural decline. In the first quarter of 2025, China's CO2 emissions fell by 1.6% year-on-year and by 1% in the previous 12 months. This decline is attributed to the growth of clean power generation, including wind, solar, and nuclear capacity, which has reduced coal-power output despite surging demand.
However, China's emissions remain only 1% below the latest peak, implying that any short-term jump could lead to a new record. The future path of China's CO2 emissions depends on trends within its economy and its response to external factors, such as trade policies. China has pledged to meet 2030 emissions targets under the Paris Agreement, but there is a growing gap that needs to be bridged to achieve this goal.
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India's air quality laws
India ranks as the third most polluting country in terms of carbon dioxide emissions, with 2.3 billion tonnes of CO2 emitted. Fourteen out of the world's 15 most contaminated cities are in India, according to the World Health Organization. Despite this, India is making considerable efforts to reduce its emissions by investing in renewable energy projects, such as wind farms.
India has had a law protecting air quality since 1981, when the Air (Prevention and Control of Pollution) Act was passed by Parliament. The Act aims to prevent, control, and reduce air pollution, with the first ambient air quality standards adopted in 1982 by the Central Pollution Control Board (CPCB) and revised in 1994 and 2009. The CPCB, along with several State Pollution Control Boards (SPCBs), provides technical advice to the Ministry of Environment and Forest (MoEF) to meet the objectives outlined in the Air Act of 1981.
The National Air Monitoring Programme (NAMP), headed by the CPCB, is a nationwide program that monitors key air pollutants, reports violations, and researches pollution trends. NAMP monitors levels of SO2, NO2, Suspended Particulate Matter (SPM), and Respirable Suspended Particulate Matter (RSPM/PM10) at 342 stations in 127 cities across India. The programme also publishes a list of cities that violate air quality standards.
The Environment (Protection) Act of 1986 authorises central and state governments to regulate activities that can harm the environment, although it does not specifically mention fuels or emission standards. Current ambient air quality standards are based on the authority of this Act, which allows for monitored values to exceed limits for up to 2% of the time per year, but not on two consecutive days.
In addition to these laws, India has also signed international agreements such as the Paris Climate Agreement, which aims to limit the increase in global temperature by reducing CO2 emissions. While India is making efforts to address air pollution, the burning of fossil fuels has grown significantly, contributing to the country's high emissions and air pollution levels.
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US emissions per capita
While China, the United States, and India are the three countries with the highest carbon dioxide (CO2) emissions, their carbon footprint per capita tells a different story. In 2023, China's CO2 emissions per capita were 9.24, while the United States' were 13.83, and India does not appear in the ranking of the 10 most polluting countries per capita.
In the United States, per capita energy-related CO2 emissions vary significantly by state. Wyoming was the biggest CO2 emitter per capita in 2021, with 94 tCO2 per person, largely due to its heavily polluting coal industry. In contrast, New York had the smallest carbon footprint in 2021, with less than 8 tCO2 per person.
The United States' high per capita emissions are influenced by various factors, including energy consumption, industrial production, and land use change. Reducing energy consumption can help lower emissions, but it is important to balance this with essential energy needs for human wellbeing and rising living standards.
Additionally, the United States' historical emissions play a role in its overall contribution to climate change. While year-to-year changes in emissions can vary, cumulative CO2 emissions since 1751 provide a longer-term perspective on a country's emissions responsibility.
It is worth noting that when discussing per capita emissions, it is essential to consider other greenhouse gases beyond CO2, such as methane and nitrous oxide, which also contribute significantly to global warming.
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EU27's GHG emissions
While it is difficult to ascertain which country has the most land-borne pollution, several countries are often cited as being the most polluting in terms of carbon dioxide emissions. China, the United States, and India are the three countries with the highest carbon dioxide (CO2) emissions. This is largely due to China's export of consumer goods and heavy reliance on coal, the United States's industrialisation, and India's burning of fossil fuels.
In 2023, global GHG emissions reached 53.0 GtCO2eq, with China, the United States, India, the EU27, Russia, and Brazil being the world's largest GHG emitters. While the EU is still a major greenhouse gas polluter, it has made significant progress in reducing its emissions in recent decades while growing its economy. The EU has set a target of reducing its GHG emissions by 55% by 2030 compared to 1990 levels. In 2022, total net GHG emissions in the EU-27 decreased by 1.3% year-on-year to 3.2 billion metric tons of CO₂ equivalent. This represents an overall reduction of roughly 31% relative to 1990 levels. The biggest factor in these reductions has been the transition to cleaner energy sources, with energy supply sector emissions falling by more than 40% since 1990. The EU has also outlined several strategies to reach its climate targets, including boosting the deployment of carbon capture technologies, implementing a new separate emissions trading system, increasing large-scale electrification, and imposing stricter emissions standards on vehicles.
Despite this progress, the EU is not on track to meet its 2030 climate target of reducing emissions by at least 55% below 1990 levels. The Climate Action Tracker (CAT) rates the EU's overall climate action and current 2030 emissions reduction target as 'Insufficient'. The CAT recommends more ambitious targets, such as a 2035 emissions reduction target of at least 74% below 1990 levels, along with increased climate finance contributions. The EU has recognised the importance of scaling up international climate finance and is working to mobilise more private finance through initiatives like the EU Taxonomy and Sustainable Finance Disclosure Regulation.
The Paris Climate Agreement aims to avoid a 2°C increase in global temperature by the end of the century through the drastic reduction of CO2 emissions by signatory countries. While not all countries have prioritised the environment, the EU has made significant progress with the European Green Deal. The EU's planned policies are now projected to achieve a 52% emission reduction by 2030 below 1990 levels. Key proposals under the EGD include revisions to the Energy Performance in Buildings Directive, the Gas Regulation and Directive, and the Methane Regulation, which aim to improve the energy efficiency of Europe's buildings and shift away from fossil fuels.
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Brazil's pollution levels
Brazil's air quality issues are closely linked to its unique position as the only country that extensively uses ethanol. About 40% of the fuel used in Brazilian vehicles is ethanol-based, which contributes to higher emissions of acetaldehyde, ethanol, and nitrogen oxides. These emissions have a significant impact on the formation of photochemical air pollution and ozone, particularly in large urban areas such as São Paulo, Rio de Janeiro, and Brasilia. Additionally, Brazil's lack of infrastructure for public transportation and the availability of low-quality fuels have led to a heavy reliance on vehicles, further contributing to air pollution.
The country's pollution levels also vary throughout the year, with the mid to end portion of the year typically experiencing worse pollution episodes. For example, the city of Campinas, the most polluted city in Brazil in 2019, recorded its highest pollution levels from May through August, with readings of 24.7 μg/m³ in May and 27.7 μg/m³ in June. These fine particulate matter readings (PM2.5) are a critical component in assessing overall air quality and can have negative health effects, including an increased risk of cancer.
Brazil also faces significant water pollution issues, particularly in its major metropolitan areas. Coastal cities like Rio de Janeiro and Recife suffer from upstream residential and industrial sewage contaminating feeder rivers, lakes, and the ocean. Additionally, mercury pollution from gold mining has led to fish contamination in the state of Amapá. Deforestation, illegal wildlife trade, poaching, land degradation, and severe oil spills are other environmental concerns in Brazil.
The country's diverse flora and fauna, including the Amazon rainforest, are particularly vulnerable to the impacts of climate change. Brazil's hydropower, agriculture, and urban water supplies are expected to be affected by rising temperatures, longer heatwaves, changing precipitation patterns, and more intense wildfires.
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Frequently asked questions
China has been the top emitter of CO2 since 2006 and is the biggest contributor to land-borne pollution.
The countries with the highest carbon dioxide emissions after China are the United States, India, the EU27, Russia, and Brazil.
India is the third most polluting country in terms of carbon dioxide emissions. However, it does not appear in the ranking of the 10 most polluting countries per capita.
Germany is the European country with the highest CO2 emissions due to its heavy dependence on coal.
