Kiera Jefferson
Pollution is a pressing issue that poses serious health risks for people and ecosystems, with low- and middle-income countries bearing the brunt of its consequences. It is the leading environmental cause of disease and premature death, killing approximately 7 to 9 million people annually. The primary sources of pollution are air, water, and land-based, with indoor air pollution being a growing concern due to the presence of radon gas, toxic mold, and secondhand smoke. Outdoor air pollution arises from wildfires, industrial processes, fossil fuel combustion, waste management, and agricultural activities. Landfills contribute to land pollution by releasing methane, a potent greenhouse gas, while water pollution is exacerbated by plastic waste and agricultural runoff. Mining activities, particularly in regions like the DRC, result in high radioactivity levels and water source contamination. Climate change, driven by greenhouse gas emissions, exacerbates natural pollution through rising temperatures, coral reef loss, and ocean acidification. The COVID-19 pandemic underscores the intricate link between the environment and health, highlighting the urgency of addressing pollution systematically.
| Characteristics | Values |
|---|---|
| Regions with the highest air pollution levels | Eastern and Southern Asia, Northern Africa |
| Regions with the lowest air pollution levels | Australia, New Zealand, other regions in Oceania and South America |
| Natural sources of air pollution | Dust storms, volcanic eruptions, wildfires, windblown dust and sand, desertification |
| Manmade sources of air pollution | Burning fossil fuels, industrial processes, waste management, demolition, agriculture, transportation, construction |
| Health effects of air pollution | Skin ageing, skin cancer, cognitive issues, asthma, pneumonia, respiratory infections, reduced life expectancy, birth defects, reproductive failure, diseases among wildlife animals |
| Global impact of air pollution | 7-8 million premature deaths per year, \(5%\) of global GDP in economic costs |
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What You'll Learn
Eastern and Southern Asia
China, a significant contributor to air pollution in East Asia, has cities like Linfen and Tianying struggling with severe air quality issues. Linfen, located in the coal-intensive Shanxi province, has the worst air quality in China, with residents reporting choking on coal dust. Tianying, a major lead production hub, exhibits lead concentrations in air and soil that far exceed national health standards, leading to lead poisoning in residents, especially children.
Southeast Asian cities like Jakarta, Bangkok, and Surabaya also experience some of the world's most polluted air. Meteorological conditions, such as low wind speeds and dry seasons, trap emissions near the surface, exacerbating air quality. The El Niño weather pattern further prolongs and intensifies high-pollution events in the region. Warmer temperatures, lack of rainfall, and increased sunshine also contribute to degraded air quality in tropical monsoon climates.
South Asian countries like India, Bangladesh, and Pakistan have witnessed significant increases in CO2 emissions and particulate matter concentrations since 1990. India's emissions quadrupled over 30 years, while Bangladesh's emissions increased more than six-fold during the same period. Nepal and Sri Lanka, however, maintained relatively low PM2.5 concentrations.
To combat climate change and reduce emissions, countries in the East Asia and Pacific region have made commitments under the Paris Agreement. They aim to strengthen climate resilience, protect natural areas, transition to renewable energy, and explore innovative financing for a sustainable future.
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Natural dust and chemical constituents
Airborne particulate matter (PM) is a complex mixture of solids and aerosols, varying in size, shape, and chemical composition. It may contain inorganic ions, metallic compounds, elemental carbon, organic compounds, and compounds from the earth's crust. The most commonly used unit in air quality measurements is PM2.5, referring to particles with a diameter of less than 2.5 micrometres. These fine particles can penetrate indoor spaces and have been linked to adverse health effects, particularly in children and older adults with pre-existing heart or lung conditions.
Natural dust storms are a significant source of PM2.5 in the Middle East, North Africa, and West sub-Saharan Africa. In East and South Asia, indoor air pollution from cooking with biomass fuels like wood is responsible for over 80% of regional pollution. China, specifically the city of Linfen in Shanxi province, has been noted for its severe air pollution due to the country's extensive coal industry.
Road dust, a type of urban dust, has been studied for its chemical profiles and health impacts. These studies have analysed the metal content, organic compounds, and fluorescent components of road dust to identify emission sources and understand potential health risks. For example, lead production in China has contaminated local crops and wheat with lead dust, resulting in lead poisoning among residents, especially children, and causing various health issues.
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Health risks in low- and middle-income countries
Air pollution is the presence of harmful substances in the air, which can be gases like ozone or nitrogen oxides, or particles like soot and dust. Outdoor air pollution comes from wildfires, industrial processes, burning fossil fuels, waste management, demolition, and agriculture. Indoor air pollution is often from burning firewood or agricultural waste for cooking and heating.
Air pollution is one of the leading causes of health complications and mortality worldwide, causing about 7 million premature deaths annually. More than 90% of these deaths occur in low- and middle-income countries. People in these countries are disproportionately affected by outdoor air pollution, with 89% of the 4.2 million premature deaths occurring in these areas, according to WHO. The greatest burden is found in the WHO South-East Asia and Western Pacific Regions.
Low-income groups are more exposed and vulnerable to air pollution, with lower access to healthcare, making the health risks of exposure more severe. In 2019, it was estimated that more than 5.5 million adults died from cardiovascular disease associated with lead exposure, 90% of whom were from lower- and middle-income countries. Children in these countries are exposed to higher levels of fine particulate matter than those in high-income countries, leading to asthma, pneumonia, and lower respiratory tract infections. In 2021, polluted air resulted in the death of over 700,000 children under the age of 14.
In addition to the health risks, pollution also hinders development outcomes. Exposure to air pollution, water pollution, and hazardous chemicals like mercury, lead, and persistent organic pollutants (POPs) creates harmful living conditions and destroys ecosystems. Pollution management offers opportunities to alleviate poverty, enhance economic growth, improve resource efficiency, and create employment opportunities.
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Global warming and natural sources
Global warming is primarily caused by human activities that have led to the greenhouse effect. This involves the atmosphere trapping heat radiating from the Earth towards space. While carbon dioxide (CO2) is released through natural processes like volcanic eruptions, human activities such as burning fossil fuels and deforestation have significantly increased its presence in the atmosphere. The burning of fossil fuels, industrial processes, waste management, agriculture, and deforestation are major human contributors to global warming and air pollution.
However, it is important to recognize that natural sources also play a role in global warming. Volcanic activity, for instance, has contributed to episodes of global warming in the deep past by releasing particles that reflect sunlight, brightening the planet, and increasing greenhouse gases over extended periods. Additionally, variations in sunlight due to tiny wobbles in the Earth's orbit have influenced when and where sunlight falls on the planet's surface, resulting in natural climate changes.
One notable natural source of pollution is volcanic eruptions. Volcanic activity releases carbon dioxide and other gases into the atmosphere, contributing to the greenhouse effect. Volcanic eruptions can also emit particles that reflect sunlight, temporarily cooling the planet. Another natural source is methane, which is released from wetlands and plant matter breakdown.
While natural sources have contributed to global warming, the impact of human activities has been significantly more pronounced. Since the Industrial Revolution, human influence on climate change has eclipsed natural temperature variations. Human activities, such as burning fossil fuels, have released vastly greater amounts of carbon dioxide into the atmosphere compared to volcanic emissions. Additionally, practices like commercial and organic fertilizer production, burning vegetation, and livestock digestion have led to the release of nitrous oxide and methane, further contributing to global warming.
Some regions of the Earth that experience natural pollution include the Middle East, North Africa, and West sub-Saharan Africa, where dust storms are a significant source of fine particulate matter (PM2.5). Linfen in Shanxi province, China, is another area known for its severe air pollution due to the coal industry, with residents reporting choking on coal dust. Dzerzhinsk, Russia, gained notoriety as the most chemically polluted city in the world due to the improper disposal of nearly 300,000 tons of chemical waste.
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Natural air pollution sources
Natural sources of air pollution are varied and include wildfires, sand or dust storms, sea spray, volcanoes, vegetation, decomposition, lightning, radon gas, and wind-blown dust. These natural sources generate air pollutants such as particulate matter, ozone, methane, volatile organic compounds (VOCs), and more, impacting air quality.
Particulate matter (PM) refers to solid or liquid compounds suspended in the air, which can potentially damage lung tissue and cause significant adverse health effects. It is typically categorized into two groups: PM2.5 and PM10. The former refers to any PM with a diameter of 2.5 micrometers or smaller, while the latter refers to PM with a diameter of 10 micrometers or smaller. PM2.5 is about 3% of the diameter of a human hair and is said to pose the greatest risk to human health. It can be inhaled deeply into lung tissue and has been linked to cognitive issues, reduced verbal fluency, and worse executive functions. It is primarily emitted by combustion sources, such as vehicles, diesel engines, and industrial facilities, but natural sources like wildfires and dust storms also contribute significantly to PM2.5 levels.
Wildfires are a significant natural source of air pollution, releasing harmful pollutants such as black carbon (soot) and toxic gases. They are one of the largest sources of black carbon, which is very harmful to human health and the environment. Black carbon can lead to lung and heart diseases and premature death, and it contributes to global warming at a much greater rate than CO2. While wildfires can be a natural phenomenon, human-driven global warming has exacerbated their frequency and intensity.
Volcanoes are another natural source of air pollution, emitting various gases into the atmosphere, including hydrogen sulfide, radon, sulfuric acid, hydrogen, carbon monoxide, hydrogen chloride, hydrogen fluoride, and helium. These emissions can have detrimental effects on the environment and human health, similar to the pollutants released by wildfires.
Other natural sources, such as sand or dust storms, sea spray, vegetation, and decomposition, also contribute to air pollution, although the impact of these sources may vary depending on the region and local conditions. For example, dust storms are a significant source of fine PM in the Middle East, North Africa, and West sub-Saharan Africa.
It is important to note that while natural sources of air pollution can have significant impacts, most harmful air pollution is caused by human activity, including the burning of fossil fuels, industrial processes, agriculture, and transportation.
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Frequently asked questions
All regions of the world are affected by natural pollution, but some areas are more susceptible than others. Regions near large deserts, like the Sahara, are heavily impacted by windblown dust and sand. Forested locations are more likely to experience air pollution from wildfires. Some examples of regions with natural pollution include:
- Antarctica: Climate change-induced melting of sea ice is threatening emperor penguin populations.
- Central Asia: Mailuu-Suu in Central Asia is home to nearly 2 million cubic meters of radioactive mining waste, threatening the entire Ferghana valley.
- South and East Asia: Indoor air pollution from cooking with wood and biomass fuels is common.
- Middle East, North Africa, and West sub-Saharan Africa: Dust storms are a source of fine particulate matter in these regions.
Natural pollution can come from various sources, including:
- Volcanic activity and smoke
- Wildfires and smoke
- Dust and sandstorms
- Radon gas released from the Earth's surface
- Desertification, which turns areas into hot, dry deserts
Natural pollution can have significant impacts on the environment. For example, ocean acidification, caused by increased carbon dioxide in the atmosphere, leads to coral bleaching and the loss of coral reefs. Climate change-induced melting of sea ice in Antarctica is also threatening emperor penguin populations.
Man-made pollution, or anthropogenic sources, refers to pollution caused by human activities. This includes burning fossil fuels, such as coal, natural gas, and oil, for energy, transportation, and industrial processes. Indoor air pollution can also be caused by burning firewood or agricultural waste for cooking and heating. Cigarette smoke and secondhand smoke are also considered indoor air pollution.
While natural pollution occurs from natural sources, human actions can still influence its impact. For example, global warming, caused by anthropogenic air pollution, is making natural pollution worse. By reducing greenhouse gas emissions and addressing climate change, we can help mitigate the effects of natural pollution. Additionally, specific tools and methods can be used to reduce the impact of natural pollution, such as radon gas levels in homes.
