Meghan Hodges
The world's most polluting industries are responsible for emitting significant amounts of greenhouse gases (GHGs) and contributing to the global carbon footprint. While there is no standard approach for determining the most polluting industries, several sectors stand out for their impact on the planet's health. The energy industry, including the fossil fuels sector, is often identified as the most polluting, generating billions of tonnes of GHG emissions annually and powering various aspects of daily life. Transport, including aviation and road transport, is another significant contributor, accounting for a large portion of direct and indirect GHG emissions. Other polluting industries include fashion or textiles, agriculture, and construction, which impact air, water, and soil pollution. To tackle climate change, it is crucial to prioritize decarbonization and sustainable practices in these sectors.
| Characteristics | Values |
|---|---|
| Countries with the highest carbon dioxide emissions | China, the United States, and India |
| Europe's highest CO2 emissions | Germany |
| Countries with the highest carbon dioxide emissions per capita | Located in the Arabian Peninsula |
| Country with the highest number of contaminated cities | India |
| Common sources of air pollution | Household combustion devices, motor vehicles, industrial facilities, and forest fires |
| Major outdoor pollution sources | Residential energy for cooking and heating, vehicles, power generation, agriculture/waste incineration, and industry |
| Major pollutants | Particulate matter, carbon monoxide, ozone, nitrogen dioxide, and sulfur dioxide |
| People affected by air pollution | People of color and people with lower incomes |
| Health risks of air pollution | Asthma attacks, harm to lung development in children, strokes, heart disease, lung cancer, acute and chronic respiratory diseases |
| Global access to electricity | 92% |
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What You'll Learn
- Most polluted countries: China, the US and India are the top three
- Most polluted cities: 14 of the top 15 are in India
- Health risks: Air pollution can trigger asthma, harm lung development and cause strokes
- Household pollution: 2.4 billion people are exposed to dangerous levels of indoor air pollution
- Climate change: Air pollution and climate change increase the health impacts of allergens
Most polluted countries: China, the US and India are the top three
China, the United States, and India are the top three most polluting countries in the world. China leads in emissions, primarily driven by its extensive use of coal and its position as the world's biggest industrial and commercial power. The country has also been taking steps to improve its air quality, with a five-year trend of declining pollution levels until 2023. Chinese cities used to dominate global rankings of the world's worst air quality, but clean air policies over the past decade have improved the situation. As a result, the average Chinese citizen's lifespan is now 2.2 years longer.
The United States is the second-largest emitter of carbon dioxide, with 4.4 billion tonnes of CO2 emitted annually. This is largely attributed to its industrial revolution period and heavy reliance on fossil fuels. While the US has made efforts to address climate change, such as the Inflation Act, major cities like Columbus, Ohio continue to face high levels of pollution.
India is the third most polluting country in terms of carbon dioxide emissions, with 2.3 billion tonnes of CO2 emitted. India's pollution levels are driven by its high dependence on oil, coal, gas, and fossil fuels, as well as agricultural burning. Fourteen out of the world's 15 most contaminated cities are in India, and 96% of its population lives with air quality seven times higher than WHO guidelines. Despite this, India is making efforts to reduce its emissions by investing in renewable energy projects, such as wind farms.
While these three countries are the largest contributors to global pollution, it is important to recognize that almost all countries are responsible for the high levels of pollution worldwide. Additionally, the calculation method used to determine pollution levels can vary, including factors such as CO2 emissions, per capita emissions, and ecological footprint.
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Most polluted cities: 14 of the top 15 are in India
India has 14 of the 15 most polluted cities in the world in terms of PM 2.5 concentrations. Kanpur is the most polluted city, with a PM 2.5 concentration of 173 micrograms per cubic metre. Other Indian cities that registered very high levels of PM2.5 pollutants include Delhi, Patna, Agra, Muzaffarpur, Srinagar, Gurgaon, Jaipur, Patiala, and Jodhpur. Delhi, for example, recorded a PM 2.5 annual average of 143 micrograms per cubic metre in 2016, more than three times the national safe standard, while the PM 10 average was 292 micrograms per cubic metre, more than 4.5 times the national standard. In May 2014, the World Health Organization announced New Delhi as the most polluted city in the world. The Great Smog of Delhi in November 2016 was an environmental event that saw New Delhi and adjoining areas in a dense blanket of smog, the worst in 17 years.
According to the Global Burden of Disease Study of 2017, 76.8% of Indians are exposed to higher ambient particulate matter over 40 μg/m3, which is significantly above the national limit recommended by national guidelines on ambient air pollution. The study estimated that ambient air pollution in India causes 670,000 deaths annually and particularly aggravates respiratory and cardiovascular conditions, including chronic bronchitis, lung cancer, and asthma. Chronic obstructive pulmonary disease (COPD) accounted for 19% of the total deaths caused in the year by air pollution, while 7% of people died of lung cancer. Overall, air pollution contributes to the premature deaths of 2 million Indians every year.
The main contributors to India's particulate air pollution include industrial and vehicular emissions, construction dust and debris, dependence on thermal power for electricity, waste burning, and the use of wood and dung by low-income and rural households for cooking and heating. 51% of India's air pollution is caused by industrial pollution, 27% by vehicles, 17% by crop burning, and 5% by other sources. Traffic congestion is severe in India's cities and towns, and vehicles with adulterated fuel increase tailpipe emissions of harmful pollutants. In rural areas, much of the pollution stems from biomass burning for cooking and keeping warm.
To address the issue of air pollution, the Indian government, together with IIT Kanpur, launched the National Air Quality Index in 2015. In 2019, India launched the National Clean Air Programme, with a tentative national target of a 20%-30% reduction in PM2.5 and PM10 concentrations by 2024. The programme will be rolled out in 102 cities with poor air quality. Other initiatives include the Great Green Wall of Aravalli, a 1,600-kilometre-long and 5-kilometre-wide green ecological corridor that will connect the Aravalli range from Gujarat to Delhi and the Shivalik hill range, with the planting of 1.35 billion new native trees over 10 years.
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Health risks: Air pollution can trigger asthma, harm lung development and cause strokes
Air pollution is a pressing issue that poses significant risks to human health, including the triggering of asthma, adverse effects on lung development, and an increased likelihood of strokes.
Asthma is a respiratory condition characterized by inflammation and narrowing of the airways, and air pollution can play a detrimental role in both triggering asthma and exacerbating its symptoms. Studies have found a correlation between air pollution and the worsening of asthma symptoms. Ozone, a highly reactive component of air pollution, is particularly irritating to the lungs and airways, triggering asthma attacks. Additionally, breathing in nitrogen dioxide (NO2) from sources such as vehicle emissions and power plants can lead to the development of asthma and worsen existing lung diseases.
The impact of air pollution on lung development is also a cause for concern, especially in children. Children are more susceptible to the harmful effects of air pollutants due to their smaller airways and immature detoxification and metabolic systems. Prolonged exposure to air pollution increases the risk of children developing asthma and experiencing respiratory infections. Furthermore, air pollution has been linked to reduced lung function and enhanced airway reactivity in children with asthma, leading to more frequent emergency room visits.
The health risks of air pollution extend beyond respiratory issues, as it has also been associated with an increased likelihood of strokes. While the causal relationship between air pollutants and strokes is complex and challenging to prove, epidemiological studies have found significant associations. Exposure to urban particulate matter (PM) pollution can lead to pulmonary inflammation and elevated levels of inflammatory markers in the bloodstream. These inflammatory pathways, along with oxidative stress, can have indirect effects on the cardiovascular system, potentially contributing to an increased risk of stroke.
The smallest particles in air pollution, known as PM2.5, are the most dangerous as they can penetrate deep into the lungs and potentially enter the bloodstream, causing systemic issues. These nanoparticles have been linked to cardiovascular disease and may contribute to conditions such as stroke. Additionally, combustion-derived particles in air pollution contain a range of surface chemicals, including reactive transition metals and organic hydrocarbons, which are believed to drive inflammation and oxidative stress, further elevating the risk of cardiovascular events.
Addressing air pollution and mitigating its health risks require a collective effort from governments, industries, energy sectors, and the public. By improving air quality through cooperative actions, we can lessen the impact of air pollution on human health, particularly in vulnerable populations such as children, the elderly, and individuals with pre-existing respiratory conditions.
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Household pollution: 2.4 billion people are exposed to dangerous levels of indoor air pollution
Air pollution is a serious issue that affects billions of people worldwide. According to the World Health Organization (WHO), around 2.4 billion people are exposed to dangerous levels of indoor air pollution, also known as household air pollution. This is caused primarily by the use of polluting open fires or inefficient stoves for cooking. Solid fuels such as wood, charcoal, coal, animal dung, crop waste, and kerosene are commonly burned, releasing harmful pollutants into the air.
Household air pollution disproportionately affects people in low- and middle-income countries, with about 2.1 billion people relying on these fuels and technologies for cooking. In 2021, 49% of the global rural population used polluting fuels, compared to only 14% in urban areas, highlighting a significant discrepancy in access to cleaner alternatives. Women and children are particularly vulnerable to the effects of household air pollution, as they typically spend more time near the domestic hearth and are often responsible for household chores such as cooking and collecting firewood.
The pollutants released from incomplete combustion in households include particulate matter, black carbon, methane, and other toxic gases. These fine particles can penetrate deep into the lungs and enter the bloodstream, causing a range of adverse health effects. Exposure to household air pollution is associated with an increased risk of non-communicable diseases, including stroke, ischaemic heart disease, chronic obstructive pulmonary disease (COPD), and lung cancer. In 2020, an estimated 3.2 million deaths were attributed to household air pollution, including over 237,000 children under the age of five.
The combined effects of household and ambient (outdoor) air pollution are severe. Together, they are associated with approximately 6.7 million premature deaths annually, with outdoor air pollution causing about 4.2 million premature deaths each year. Outdoor air pollution is caused by various sources, including residential energy use, vehicles, power generation, agriculture, waste incineration, and industry. The major components of particulate matter in outdoor air pollution include sulfates, nitrates, ammonia, sodium chloride, black carbon, mineral dust, and water.
Addressing household air pollution is crucial to improving public health and reducing premature deaths. The WHO provides technical support and guidance to countries and regions to help transition to cleaner household fuels and technologies. Strategies to increase the adoption of clean household energy include financial support for purchasing cleaner alternatives, improved ventilation and housing design, and communication campaigns to encourage the use of clean energy. Additionally, access to electricity is essential, as its lack forces households to rely on polluting devices and fuels, further exacerbating indoor air pollution.
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Climate change: Air pollution and climate change increase the health impacts of allergens
The increase in cases of asthma and allergies has become a pressing health issue globally. While these ailments were uncommon a few decades ago, they now affect a significant portion of the population in many regions. The major factors contributing to this rise include both environmental and genetic factors. Environmental factors encompass outdoor and indoor pollutants, such as chemical irritants (nitrogen dioxide, ozone, sulfur dioxide, particulate matter, and volatile organic compounds) and biophysical parameters (dust mites, pet allergens, and mold). Genetic factors, on the other hand, involve individual susceptibility to specific allergens.
Air pollution and climate change are significant drivers of the increasing prevalence of allergic diseases. The complex molecular mechanisms by which air pollutants interact with climate parameters to influence allergies are not yet fully understood. However, it is evident that these interactions can promote the development of allergies and exacerbate existing allergic conditions. For example, higher concentrations of ground-level ozone, a byproduct of fossil fuel usage, are associated with an increased frequency of acute cardio-respiratory events and changes in the frequency of respiratory diseases.
Climate change, driven by environmental pollution and rising temperatures, has a profound impact on human health. It alters the levels and locations of aeroallergens, including pollens, molds, and mites. Rising temperatures caused by climate change lengthen allergy seasons and worsen air quality, resulting in more allergies and asthma attacks. Warmer temperatures in the United States between 1995 and 2021 extended the pollen season by 11 to 27 days, leading to increased pollen counts, stronger airborne allergens, and heightened allergy symptoms.
Additionally, climate change affects the molecular characteristics of pollen, potentially increasing their allergenic properties. This includes enhanced plant growth, higher pollen production, earlier and extended pollen seasons, and increased allergenic protein content in pollen. These changes are predicted to result in a higher incidence of allergies, with specific areas of Europe expected to experience increased pollen counts of ragweed by the end of this century. Furthermore, pollen collected in high-traffic areas exhibits higher allergenicity due to traffic-related pollution, further contributing to the impact of climate change on allergy seasons and symptom severity.
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Frequently asked questions
China, the United States, and India.
Germany, due to its heavy dependence on coal.
The three most polluting countries per capita are located in the Arabian Peninsula.
Household combustion devices, motor vehicles, industrial facilities, and forest fires.
Air pollution can trigger asthma attacks, harm lung development in children, and cause strokes, heart disease, lung cancer, and acute and chronic respiratory diseases.
