Kiera Jefferson
The countries that emit the least pollution are often overshadowed by the countries that emit the most. China, the United States, and India are the top three most polluting countries in terms of carbon dioxide (CO2) emissions. These countries are the most industrialised in the world, with China and the United States also being significant contributors to pollution due to their industrial revolution periods and heavy reliance on fossil fuels. Germany is the most polluting country in Europe, contributing over a quarter of the European Union's CO2 emissions. While India is the third most polluting country in terms of CO2 emissions, it is not among the top 10 most polluting countries per capita. The three most polluting countries per capita are all located on the Arabian Peninsula, owing to their large share of the oil industry and small populations.
| Characteristics | Values |
|---|---|
| Country with the least pollution | Unable to determine |
| Countries with the highest CO2 emissions | China, the United States, and India |
| CO2 emissions in China | 9.9 billion tonnes |
| CO2 emissions in the US | 4.4 billion tonnes |
| CO2 emissions in India | 2.3 billion tonnes |
| Country with the highest CO2 emissions in Europe | Germany |
| Country with the fourth-highest CO2 emissions | Russia |
| Russia's CO2 emissions | 1,816 million metric tons in 2023 |
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What You'll Learn
China's pollution levels
China's air pollution is a major public health issue, with fine particles in the polluted air penetrating deep into the lungs and cardiovascular system, causing diseases including stroke, heart disease, lung cancer, chronic obstructive pulmonary diseases, and respiratory infections. In 2012, the president of the China Medical Association, Zhong Nanshan, warned that air pollution could become the country's biggest health threat. Air pollution is responsible for about 2 million deaths in China per year, with ambient air pollution causing more than 1 million deaths and household air pollution causing another million.
However, China has made significant progress in reducing air pollution in recent years. The country has invested substantial sums in efforts to tackle the problem, with China's Academy for Environmental Planning pledging $277 billion to combat urban air pollution in 2013. In 2016, only 25% of 338 prefecture-level cities attained the national standard for air quality, but by 2018, those same cities enjoyed good air quality on 79% of days. The amount of harmful particulates in the air in China fell by 40% from 2013 to 2020, and average PM2.5 concentrations fell by 33% from 2013 to 2017 in 74 cities. China's overall particulate pollution average is now in compliance with its national standard of 35 µg/m³, although it still exceeds the World Health Organization (WHO) guideline of 5 µg/m³. If the current pollution levels continue, China stands to lose 3.6 billion total life years. However, if the pollution is brought down to the levels prescribed by the WHO, people in China could see their average life expectancy increase by 2 years.
In addition to air pollution, water pollution is also a significant issue in China. An investigation showed that 19% of the water in the main rivers has been polluted, with a total length of 95,000 kilometers. A survey of 878 rivers in the early 1980s revealed that 80% were polluted to some extent, and that fish had become extinct in more than 5% of the total river length throughout the country. China has taken measures to address this issue, such as rapidly building out water infrastructure and increasing regulation, as well as exploring technological solutions.
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US emissions declining
The three countries with the highest carbon dioxide (CO2) emissions are China, the United States, and India. China tops the list of carbon dioxide-emitting nations, primarily due to its reliance on coal and imported oil. The US is second on the list, due to the dominance of its gasoline-fuelled transportation industry.
The US has seen a decline in emissions in recent years. From 1990 to 2022, US greenhouse gas emissions per dollar of goods and services produced by the economy (the gross domestic product or GDP) declined by 55%. This change may reflect a combination of increased energy efficiency and structural changes in the economy. The sharp decline in emissions from 2019 to 2020 was largely due to the impacts of the coronavirus (COVID-19) pandemic on travel and economic activity.
Methane emissions in the US decreased by 19% from 1990 to 2022, as reduced emissions from landfills, coal mines, and natural gas systems more than offset increases in emissions from activities such as livestock production. Landfills are America's third-largest source of methane, and while the EPA has rules in place to trap the gas, researchers say these fall short of what's needed to help limit global warming. In recent years, federal and state tax credits have incentivized operators to install systems for converting collected gas into energy, a lucrative side business that brought the US waste industry $12 billion in revenue in 2023.
Nitrous oxide emissions, predominantly from agricultural soil management practices such as the use of nitrogen as a fertilizer, decreased by 5% from 1990 to 2022. Additionally, emissions of carbon dioxide, the primary greenhouse gas emitted by human activities, decreased by 2% during this period. The growing use of natural gas and renewables to generate electricity in place of more carbon-intensive fuels has contributed to this decline.
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India's renewable energy
India is the third-largest consumer of energy in the world and the third-largest renewable energy producer. It has committed to a goal of 500 GW of renewable energy capacity by 2030, with solar power contributing approximately 90 GW, or 45% of its total renewable capacity. India's solar energy journey took a significant leap with the introduction of the Jawaharlal Nehru National Solar Mission (JNNSM) in 2010, which set ambitious targets for expanding solar energy.
Solar energy has become a key driver of India's transition to renewable energy, with states such as Rajasthan, Gujarat, and Madhya Pradesh becoming solar power hubs, hosting some of the largest solar projects globally. Wind power is also prominent in states like Tamil Nadu and Gujarat, while large hydropower projects contribute stability to the grid. India's vast solar potential, with about 300 sunny days annually, has made solar energy a cost-effective and competitive source of energy.
In addition to solar, wind, and hydro, India is actively investing in other renewable sources such as biomass and green hydrogen to build a diversified energy portfolio. The country is establishing itself as a leader in sustainable energy, balancing economic growth with environmental responsibility. India's long-term goal is to achieve net-zero carbon emissions by 2070, demonstrating its commitment to addressing climate change and reducing its carbon footprint.
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Russia's CO2 emissions
Russia is the fourth-largest contributor to CO2 emissions, emitting 1,816 million metric tons in 2023. The country's energy sector is the largest emitter of greenhouse gases, with coal, oil, gas, and cement production being significant sources. Russia has one of the largest natural gas deposits globally, and natural gas is the primary energy source for power generation in the country.
Russia accounted for 5% of worldwide greenhouse gas emissions in 2023, ranking behind China, the United States, and India. The industrial production, agriculture, and waste management sectors also contribute significantly to Russia's carbon dioxide emissions.
While Russia has significant CO2 emissions, it is important to note that the country's historical emissions are also relevant. Russia has been one of the top emitters since 1750, and cumulative CO2 emissions since 1751 provide a broader perspective on a country's contribution to climate change. Additionally, production-based emissions within a country's borders may not capture emissions from traded goods, which can be significant.
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Japan's fossil fuel use
Japan is one of the world's largest consumers of energy, with fossil fuels constituting about 87% of its energy mix. Petroleum is the most used fossil fuel, contributing a high share (40%) of overall energy usage. Natural gas and coal are also becoming increasingly crucial sources of energy, with coal accounting for 26% of gross primary energy use in 2019. Japan's heavy reliance on fossil fuels is due to its lack of domestic reserves, with over 99% of its crude oil supply and 98% of its natural gas supply being imported. This makes Japan the world's biggest importer of liquefied natural gas (LNG) and the third-largest importer of coal.
Historically, Japan's energy mix has undergone several transformations. In the 1950s, coal dominated Japan's energy sector, accounting for over 80% of its energy needs. However, by the 1970s, oil had become the primary energy source, constituting over 70% of its energy requirements. The 1973 oil crisis marked a turning point, highlighting Japan's vulnerability to external supply shocks and triggering efforts to diversify its energy sources. As a result, Japan's use of nuclear power and natural gas rose substantially, and the country became the world's third-largest consumer of nuclear power by 2010.
In 2011, the Fukushima Daiichi nuclear disaster led to a further shift in Japan's energy landscape. Nuclear energy was temporarily replaced by fossil fuels, causing a sharp increase in fossil fuel consumption. This event, coupled with the 2011 earthquake, significantly impacted Japan's energy sector and contributed to the country's continued reliance on fossil fuels.
While Japan has made progress in reducing its fossil fuel consumption and increasing renewable energy sources, it still faces challenges. There is international criticism that Japan may not expand its renewable energy capacity sufficiently to meet its carbon-neutral goals by 2050. Additionally, the vulnerability of the current system was highlighted in 2021 when gas shortages resulted in increased electricity prices.
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Frequently asked questions
It is difficult to definitively state which country pollutes the least, as this depends on various factors and calculation methods used, such as CO2 emissions, per capita, or ecological footprint. However, some countries are known for their efforts to reduce pollution and their commitment to environmental sustainability. These include countries with a strong focus on renewable energy sources and legislative measures to control emissions.
A country's pollution levels are influenced by various factors, including industrial activities, population, energy generation methods, and the implementation of environmental policies. Heavily industrialised and densely populated countries tend to have higher pollution levels due to increased human activity and the extensive use of fossil fuels.
Pollution is typically measured using metrics such as carbon dioxide (CO2) emissions, parts per million (PPM), and the World Air Quality Index (AQI). CO2 emissions reflect the amount of carbon dioxide released into the atmosphere, primarily from the use of fossil fuels and industrial activities. PPM is a unit of measurement used to calculate the concentration of pollutants in the air. The AQI provides a comprehensive assessment of air quality by considering multiple pollutants and their potential health impacts.
While specific rankings may vary, some countries are recognised for their relatively low pollution levels or their significant improvements in reducing pollution. These include countries that have implemented sustainable practices, invested in renewable energy projects, and actively participated in global initiatives to address climate change. Examples include India, which is making considerable efforts to reduce greenhouse gas emissions by investing in renewable energy sources, and European countries that have introduced policies like the Carbon Border Adjustment Mechanism (CBAM) to address carbon leakage and control emissions.
