Bronte Wells
Burning coal releases a number of airborne toxins and pollutants, which have been linked to asthma, breathing difficulties, brain damage, heart problems, cancer, neurological disorders, and premature death. The primary pollutants emitted from burning coal are sulfur dioxide, nitrogen oxides, carbon dioxide, mercury, particulates, and various other heavy metals. In this paragraph, we will explore the criteria air pollutants that result from burning coal and their impacts on human health and the environment.
| Characteristics | Values |
|---|---|
| Sulfur dioxide | Contributes to acid rain and respiratory illnesses |
| Nitrogen oxides | Contribute to smog and respiratory illnesses |
| Particulates (soot) | Linked with chronic bronchitis, aggravated asthma, cardiovascular effects like heart attacks, and premature death |
| Carbon dioxide (CO2) | The primary greenhouse gas produced from burning fossil fuels, contributing to global warming |
| Mercury | Linked to neurological and developmental damage in humans and other animals |
| Fly ash and bottom ash | Residues created when power plants burn coal |
| Carbon monoxide | Causes headaches and places additional stress on people with heart disease |
| Volatile organic compounds (VOC) | Form ozone |
| Arsenic | Causes cancer |
| Lead | N/A |
| Cadmium | N/A |
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What You'll Learn
Sulfur dioxide, nitrogen oxides, and particulates
The burning of coal results in the emission of several pollutants, including sulfur dioxide, nitrogen oxides, and particulates. These emissions have significant environmental and health impacts.
Sulfur dioxide (SO2) is one of the primary pollutants released into the atmosphere when coal is burned. Coal naturally contains sulfur, which is released as SO2 during combustion. This pollutant contributes to the formation of acid rain, which has detrimental effects on aquatic ecosystems and infrastructure. Acid rain also exacerbates the corrosion of buildings and structures. In addition to its environmental consequences, sulfur dioxide poses risks to human health, as it can cause and exacerbate respiratory illnesses.
Nitrogen oxides (NOx) are another significant pollutant produced from burning coal. These emissions contribute to the formation of smog, which reduces visibility and has adverse effects on air quality. Similar to sulfur dioxide, nitrogen oxides are associated with respiratory problems and illnesses. They are also a key contributor to the formation of ground-level ozone, which is a harmful pollutant that affects both human health and the environment.
Particulates, also known as particulate matter (PM), refer to tiny solid or liquid droplets suspended in the air. These particles can be released directly from the combustion of coal or formed indirectly through chemical reactions in the atmosphere. Particulates contribute to reduced visibility, haze, and the formation of smog. They pose health risks, particularly to the respiratory system, and have been linked to respiratory illnesses and lung disease. Particulates can penetrate deep into the lungs and even enter the bloodstream, causing or worsening cardiovascular and respiratory conditions.
To mitigate the emissions of these pollutants, various technologies and strategies have been implemented. Power plants use flue gas desulfurization equipment, or "scrubbers," to remove sulfur from the smoke before it exits the smokestacks. Additionally, the coal industry and governments have collaborated to develop methods for removing impurities from coal and improving energy efficiency, thereby reducing the amount of coal burned. Efforts are also underway to reduce mercury emissions and capture carbon dioxide (CO2) through carbon capture and sequestration technologies.
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Carbon dioxide and climate change
Carbon dioxide (CO2) is the primary greenhouse gas produced when fossil fuels such as coal, oil, and natural gas are burned. In 2022, CO2 emissions from burning coal for energy accounted for about 19% of total US energy-related CO2 emissions and about 55% of total CO2 emissions from the electric power sector. Coal-fired power plants emit significant amounts of CO2, contributing to global warming and climate change.
The burning of coal releases carbon molecules that were formed deep underground over thousands of years. When coal is burned, it reacts with oxygen in the air to produce carbon dioxide, a heat-trapping gas. This carbon dioxide is released into the atmosphere, where it acts like a blanket, warming the Earth's surface. The consequences of this global warming include rising temperatures, accelerating sea level rise, drought, heat waves, heavy rainfall, intensified storms, and species loss.
The amount of carbon dioxide in the atmosphere has been increasing since the start of the Industrial Revolution, with annual emissions of carbon dioxide from burning fossil fuels rising every decade. In the last decade (2015-2024), the annual increase in atmospheric carbon dioxide has accelerated to 2.6 parts per million (ppm) per year, with a global average of 422.8 ppm in 2024. This is causing the Earth's atmosphere to warm at an unprecedented rate, with severe ecological and human impacts.
To address these emissions, scientists are working on carbon capture and storage (CCS) technologies that can capture CO2 from power plants and inject it underground for permanent storage. However, CCS remains expensive and technically challenging to implement. Other methods to reduce the environmental impact of coal burning include reusing and recycling waste, as well as land reclamation for airports, landfills, and golf courses.
In conclusion, the burning of coal releases carbon dioxide, a potent greenhouse gas that contributes significantly to climate change. The increasing concentrations of CO2 in the atmosphere have severe consequences for the planet, and efforts to reduce emissions and mitigate ecological disruption are ongoing.
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Mercury and heavy metals
Mercury is a highly toxic heavy metal that is released into the atmosphere when coal is burned. It is a neurotoxin that can cause brain damage in babies and is linked to heart disease and other serious health issues. Coal-fired power plants are the biggest source of mercury pollution, with coal plants responsible for 42% of mercury emissions in the US. Mercury is also a global pollutant, impacting ecosystems in the Arctic Circle and other remote regions.
Mercury is not only a concern for those living near power plants but also for people across the country, as it contaminates land, oceans, and streams, and accumulates in the food we eat, particularly fish. Methylmercury, the toxic form of mercury that is produced after mercury is released into the environment, can cross the blood-brain and placental barriers, posing risks to children and pregnant people.
In addition to mercury, other heavy metals are released when coal is burned, including lead, cadmium, arsenic, nickel, tin, and antimony. These heavy metals are environmentally and biologically toxic and can contaminate water sources and the food we eat.
Efforts have been made to reduce mercury emissions from coal-burning power plants, such as the Mercury and Air Toxics Standards implemented by the EPA in 2012, which lowered mercury emissions from power plants. However, many power plants continue to emit mercury and stronger safeguards are needed to protect public health. Technologies such as carbon capture and storage (CCS) and activated carbon injection can help reduce mercury emissions, but more widespread adoption and further research are needed.
The Clean Air Act and subsequent amendments have also played a role in reducing mercury emissions by mandating the EPA to control toxic air pollutants and take action to reduce emissions from high-emitting sources. Despite these efforts, mercury pollution from coal-burning power plants remains a significant issue, and communities near these plants continue to face disproportionate exposure to this dangerous neurotoxin.
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Air pollution and health
Air pollution is a major threat to global health and prosperity. It is the presence of one or more contaminants in the atmosphere, such as dust, fumes, gas, mist, odour, smoke or vapour, in quantities that can be harmful to human health. Burning coal releases a number of airborne toxins and pollutants, including mercury, lead, sulfur dioxide, nitrogen oxides, particulates, and various other heavy metals. These pollutants have been linked to a range of adverse health effects, including respiratory illnesses, cardiovascular issues, neurological problems, and even cancer.
Particulate matter, often referred to as "soot," is a particularly harmful component of air pollution from coal burning. These tiny particles can penetrate deep into the lungs and even enter the bloodstream, causing serious health issues such as aggravated asthma, cardiovascular problems like heart attacks, and increased mortality risk. The health effects of particulate matter are becoming increasingly recognised, with research indicating that it is a deadly and growing threat to public health.
Coal-fired power plants have been associated with elevated levels of air pollution and a range of health issues. In the United States, coal power plants emitted significant amounts of airborne particles, heavy metals, carbon monoxide, volatile organic compounds (VOCs), and arsenic in 2014. These emissions contribute to air pollution and have been linked to adverse health consequences.
Mercury, a toxic heavy metal released during coal combustion, poses significant health risks. It can damage the nervous, digestive, and immune systems and is a serious threat to child development. Even small amounts of mercury deposited in lakes can render fish unsafe to eat. Mercury emissions from coal plants contribute significantly to overall mercury emissions in the United States.
Climate change is another critical long-term global impact of coal burning. Coal combustion releases carbon dioxide (CO2), a heat-trapping gas that contributes to global warming. This, in turn, leads to rising temperatures, accelerating sea level rise, droughts, heatwaves, intensified storms, and species loss. The consequences of climate change further exacerbate health issues, particularly in vulnerable populations.
Regulations and advancements in technology have helped address some of the emissions from coal-powered plants. The Clean Air Act and similar legislations have played a crucial role in reducing pollutants released into the air. Additionally, technologies like carbon capture and storage (CCS) offer potential solutions for capturing and storing CO2 emissions, although they are still expensive and unproven at scale.
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Land and water pollution
The burning of coal has profound effects on the environment, including land and water pollution. Coal is a fossil fuel that has been a reliable source of energy for the US, but it has detrimental impacts on the environment and public health.
Land Pollution
Mountaintop removal and valley fill mining in the Appalachian Mountains of West Virginia and Kentucky have altered the landscape. This type of coal extraction involves removing mountain tops with explosives, which changes the topography. Streams are often blocked by rock and dirt, and the water draining from these valleys may contain pollutants that harm aquatic life downstream. The US laws require that dust and water runoff from mining operations be controlled, and the affected areas must be restored to their original state.
Underground mines can also affect the land. The ground above mine tunnels can collapse, and acidic water can drain from abandoned mines. Additionally, methane gas, which is present in coal deposits, can explode if it becomes concentrated in underground mines. This methane must be vented to ensure the safety of mine workers.
Water Pollution
The lifecycle of coal, from mining to burning, can significantly impact water supplies. Mining operations can contaminate nearby water sources with highly acidic water containing heavy metals like arsenic, copper, and lead. This process, known as acid mine drainage, occurs when substances like iron sulfide are exposed to air and water, altering the pH of nearby streams.
Coal plants also contribute to water pollution. The "once-through" coal plants pump water from a source, heat it, and then discharge it back, creating "thermal pollution." This warmer wastewater can decrease fertility and increase heart rates in fish. While "wet-recirculating" plants avoid this issue by reusing water, they consume more water per year due to losses during the cooling process.
The storage of coal ash, a byproduct of coal burning, is another concern. Coal ash is often stored in improvised ponds that can leak, contaminating rivers and streams with toxic substances like arsenic, lead, and mercury. Coal ash impoundment failures have resulted in environmental disasters, such as the Kentucky coal slurry impoundment breach in 2000, which released hundreds of millions of gallons of sludge.
Pollution Control Efforts
Efforts to reduce pollution from coal burning are underway. The Clean Air Act and the Clean Water Act require industries to minimize pollutants released into the air and water. The coal industry has developed methods to reduce sulfur and other impurities in coal, and power plants use flue gas desulfurization equipment ("scrubbers") to remove sulfur from emissions. Additionally, carbon capture and storage technologies aim to capture CO2 and store it underground, though this technology is still expensive and unproven at scale.
While these measures help mitigate the environmental impacts of coal burning, the continued reliance on coal as an energy source contributes to global warming and climate change, posing long-term challenges that require further action.
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Frequently asked questions
Burning coal releases a number of airborne toxins and pollutants, including mercury, lead, sulfur dioxide, nitrogen oxides, particulates, and various other heavy metals.
Health impacts of these pollutants range from asthma and breathing difficulties to brain damage, heart problems, cancer, neurological disorders, and premature death.
The Clean Air Act and the Clean Water Act require industries to reduce pollutants released into the air and water. Power plants use flue gas desulfurization equipment (also known as scrubbers) to clean sulfur from the smoke before it leaves their smokestacks. Scientists are also working on new ways to reduce mercury emissions and capture carbon dioxide (CO2) from coal-burning power plants.
