Bronte Wells
The countries that emit the most pollution are typically those that are highly industrialised, with dense populations, and have large export markets. China, the United States, and India are the three countries with the highest carbon dioxide emissions, with China being the largest climate polluter, making up nearly 30% of global emissions. However, when looking at per capita emissions, the average American is responsible for nearly twice as much climate pollution as the average person in China, and India's emissions are significantly below the global average. Germany is the European country with the highest CO2 emissions, contributing over 1/4 of the entire European Union's total emissions.
| Characteristics | Values |
|---|---|
| Country with the highest carbon dioxide emissions | China |
| Second-highest carbon dioxide emissions | The United States |
| Third-highest carbon dioxide emissions | India |
| European country with the highest carbon dioxide emissions | Germany |
| Country with the highest carbon dioxide emissions per capita | Three countries on the Arabian Peninsula |
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What You'll Learn
Countries with the highest CO2 emissions
While almost all countries are responsible for high levels of global pollution, some of the most polluting countries in the world are China, the United States, India, the EU27, Russia, and Brazil. China has been emitting more CO2 than any other country since 2006, with 9.9 billion tonnes of CO2 emissions, largely due to the export of consumer goods and its heavy reliance on coal. The United States emitted 4.4 billion tonnes of CO2 in 2022, and India emitted 2.3 billion tonnes of CO2 in the same year. Germany is the European country with the highest CO2 emissions, contributing to over a quarter of the entire European Union's total CO2 emissions.
Despite agreements such as the Kyoto Protocol, carbon dioxide emissions continue to rise. Global fossil CO2 emissions decreased by 5.3% in 2020 compared to 2019 due to the COVID-19 pandemic. However, emissions bounced back in 2021, reaching levels similar to 2019. In 2021, several countries, including the EU27, the US, India, Russia, and Japan, saw emissions increases of more than their GDP recovery rates.
The most populated and industrialised countries tend to be the most polluting. China, as the world's most populated country, has seen its industries emit more carbon dioxide than any other country. As a result, Beijing has experienced constant red alerts for environmental pollution in recent years. India, the world's second-most populated country, has also seen a significant increase in the burning of fossil fuels, leading to it becoming the third-most polluting country in terms of carbon dioxide emissions.
While China has the highest CO2 emissions, some argue that for a fair comparison, emissions should be analysed per capita. In 2023, China's CO2 emissions per capita were 9.24, less than two-thirds of the United States' 13.83 and much lower than Palau's 62.59, the country with the highest emissions per capita.
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Per capita emissions
When it comes to per capita emissions, or the average emissions per person in a country, there are a few ways to measure this. One way is to look at the total emissions produced within a country's borders (territorial or production-based emissions). Another way is to adjust for trade by considering domestic emissions minus the emissions generated in producing exported goods and services, plus the emissions from producing imported goods and services (consumption-based emissions).
Using the territorial method, the countries with the highest per capita emissions are major oil-producing countries with relatively low populations, such as Qatar, the United Arab Emirates, Bahrain, and Kuwait. More populous countries with high per capita emissions include the United States, Australia, and Canada, which have emissions around three times the global average. There is a strong relationship between income and per capita emissions, as higher-income countries tend to have higher carbon footprints. However, there can be significant differences in per capita emissions even among countries with similar standards of living.
On the other hand, when adjusting for trade, Asia becomes the largest emitter, accounting for around half of global emissions. China is the largest emitter within Asia and the world, emitting more than a quarter of global emissions. North America, dominated by the United States, is the second-largest emitter, followed by Europe. While Africa and South America are smaller emitters, contributing 3-4% of global emissions each, their per capita emissions are relatively low due to their large populations.
It is worth noting that the calculation method used to determine the most polluting countries can vary, and other factors such as population and industrial activity also play a role in a country's overall pollution levels. Additionally, some countries, like India, are making efforts to reduce their emissions by investing in renewable energy sources.
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Ecological footprint
The Ecological Footprint of a population is its impact on the environment, encompassing factors such as carbon dioxide emissions, deforestation, mining, and waste management. It is a metric computed by the Global Footprint Network to assess the impact of human activities on the environment in a given place or country. Ecological footprint is often used alongside the complementary metric of biocapacity, which refers to the ability of an environment to support life and accommodate the population's ecological footprint. Biocapacity takes into account factors such as carbon sequestration by trees and the replenishment of wildlife stocks.
When a country's biocapacity exceeds its ecological footprint, it possesses an "Ecological Reserve" or "Biocapacity Reserve," indicating a positive balance. Conversely, when a country's biocapacity falls short of its ecological footprint, it results in an "Ecological Deficit" or "Biocapacity Deficit," signifying that the population's demand for natural resources surpasses its supply. This deficit can lead to resource shortages, higher prices, and heightened pollution levels in the air, water, and soil.
The ecological footprint and biocapacity of a country are influenced by various factors, including geography, population size, environmental policies, and the level of development. Generally, highly developed and high-income countries tend to have larger ecological footprints due to their greater industrial output and higher consumption patterns. However, developing countries can also contribute significantly to ecological footprints, especially through the burning of fossil fuels.
According to the Global Footprint Network's National Footprint and Biocapacity Accounts, more than 80% of the world's population resides in countries running ecological deficits. This highlights the urgent need for sustainable practices and resource management.
While this response focuses on the ecological footprint aspect, it is worth noting that the most polluting countries in terms of CO2 emissions are China, the United States, and India. These countries have significant contributions to global carbon dioxide emissions, with China emitting 9.9 billion tonnes, the United States 4.4 billion tonnes, and India 2.3 billion tonnes.
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Most polluted cities
Air pollution is a pressing issue that affects the lives of millions worldwide. According to the World Health Organization (WHO), 9 million people die prematurely each year due to air pollution from burning coal, oil, and gas. Furthermore, 99% of people worldwide live in areas where the air quality exceeds the safe limits set by the WHO.
The IQAir report, based on data from over 80,000 data points, revealed that India is the most polluting country in the world. India is home to 63 of the 100 most polluted places, with 12 of the world's 15 most polluted cities. The report also found that Indian cities had lower levels of air pollution in 2021 compared to the previous year due to stringent measures to reduce coal consumption and emissions. Despite this, Indian cities continue to dominate the list of most polluted cities, with 6 out of the top 10 being located in India in 2024-25.
In 2024-25, Byrnihat, located on the border of Assam and Meghalaya in India, was identified as the most polluted city in the world. It recorded a staggering annual average PM2.5 concentration of 128.2 μg/m³, which far exceeded the WHO-recommended limit of 10 μg/m³. Delhi, the capital of India, has also consistently ranked as the most polluted national capital for six consecutive years.
Other cities that have been mentioned in reports as being among the most polluted include Ghaziabad, which ranked as the most polluted city in the world in 2019 with an average air quality index of 110.2. Hotan, China, was the second most polluted city that year, with an AQI of 110.1. Pollution in Hotan has been attributed to rapid industrialization and frequent sandstorms.
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Global health impact
The impact of pollution on global health is profound and far-reaching. According to The Lancet, air pollution is responsible for over 10% of all deaths worldwide, amounting to nearly 4.5 million premature deaths in 2019. This figure does not even include indoor air quality, which caused an additional 2 million premature deaths in the same year. Air pollution affects multiple organs and systems in the human body and takes a significant toll on both human and ecological health.
China, the United States, and India are the top three countries with the highest carbon dioxide emissions. China's emissions are attributed to its export of consumer goods and heavy reliance on coal. The United States and India also have substantial emissions, with India's rapid industrial growth contributing significantly to its position as the third-most polluting country. Fourteen of the world's 15 most contaminated cities are in India, according to the World Health Organization.
The consequences of these emissions are dire. Constant red alerts for environmental pollution have been issued in Beijing, China, in recent years, affecting both urban and rural areas. India is also grappling with the consequences of pollution, despite its law protecting air quality since 1981. The burning of fossil fuels has increased in the country, impacting its air quality.
Despite agreements like the Kyoto Protocol, carbon dioxide emissions continue to rise, and global warming intensifies. The International Energy Agency (IEA) forecasts an alarming 130% increase in emissions by 2050 if no significant changes are made. The health implications of this projected increase are concerning, with the potential for even more premature deaths and adverse health effects worldwide.
While the top five most polluting countries contribute significantly to global pollution, it is important to recognize that almost all countries play a role in the high level of global pollution. The densely populated and industrialized nations are at the top of the list of the world's most polluted countries, and their actions (or lack thereof) have significant repercussions for global health.
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Frequently asked questions
China is the largest climate polluter, making up nearly 30% of global emissions.
The three most polluting countries per capita are located in the Arabian Peninsula due to their large share of the oil industry and small populations.
Germany has the highest CO2 emissions in Europe due to its heavy dependence on coal.
