Katerina Swanson
Mercury is a naturally occurring chemical element found in rock in the Earth's crust. It is toxic to humans and wildlife and can cause brain damage in babies, among other serious health issues. Human activities, such as mining and fossil fuel combustion, have led to widespread global mercury pollution. Burning fossil fuels, such as coal, oil, and wood, releases mercury into the atmosphere, where it can stay airborne for over a year and travel thousands of miles to remote ecosystems. Once deposited, microorganisms can convert it into methylmercury, a highly toxic form that accumulates in fish, shellfish, and animals that eat fish, posing risks to human health through consumption. Power plants that burn coal to generate electricity are a major source of mercury emissions, and regulations have been implemented to reduce these emissions and protect public health.
| Characteristics | Values |
|---|---|
| Mercury is released by | Burning fossil fuels, coal, oil, and wood as fuel |
| Mercury is a naturally-occurring | Chemical element found in rock in the earth's crust |
| Mercury exists in several forms | Elemental or metallic mercury, a shiny, silver-white metal that is liquid at room temperature |
| Mercury becomes airborne | When fossil fuels are burned for energy |
| Mercury in the atmosphere | Can stay airborne for over a year and travel to remote ecosystems |
| Mercury in the upper atmosphere | Is relatively harmless to people |
| Mercury combined with other elements | Can become a type of salt that dissolves in water vapour and falls as rain |
| Mercury deposited on land | Can contaminate soil and wash into waterways |
| Mercury in waterways | Can be converted into methylmercury, a highly toxic form that accumulates in fish and shellfish |
| Mercury exposure in humans | Most often occurs through the consumption of contaminated fish and shellfish |
| Mercury emissions sources | Artisanal and small-scale gold mining, coal combustion, non-ferrous metal production, and cement production |
| Global mercury emissions estimate | 2,220 metric tons per year from anthropogenic sources |
| Mercury pollution reduction | The use of pollution-control technologies, plant closures, and transitions to cleaner fuel sources have helped reduce mercury pollution |
| Health effects of mercury exposure | Birth defects, Brain damage, Heart disease, and other serious issues |
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What You'll Learn
- Mercury is a naturally-occurring chemical element found in rock in the earth's crust
- Burning fossil fuels releases mercury into the atmosphere
- Mercury can stay airborne for over a year and travel thousands of miles
- Mercury becomes a harmful toxic, methylmercury, that accumulates in fish and animals
- Mercury exposure is dangerous to human health, especially for developing fetuses and young children
Mercury is a naturally-occurring chemical element found in rock in the earth's crust
Mercury is a naturally-occurring chemical element that can be found in rock in the Earth's crust. It is identified by the symbol "Hg" and has an atomic number of 80. Mercury is a heavy, silver-white metal, historically referred to as quicksilver, and is the only metallic element that is liquid at standard temperature and pressure. It is toxic to humans and animals, with adverse health effects on the nervous, digestive, and immune systems, as well as the kidneys, skin, and eyes.
Mercury is found in the Earth's crust in deposits of coal and other fossil fuels, as well as in ores such as cinnabar, metacinnabar, sphalerite, corderoite, and livingstonite. These ores often occur in hot springs or other volcanic regions. While mercury occurs naturally, human activities such as mining and the burning of fossil fuels have led to increased mercury emissions and widespread global mercury pollution.
The burning of coal, oil, and other fossil fuels releases mercury into the atmosphere. Mercury can remain airborne for extended periods, travelling thousands of miles and eventually settling as rainfall or dry gaseous deposits. This deposited mercury can then be washed into waterways, leading to water contamination. Additionally, microorganisms can convert inorganic mercury into methylmercury, a highly toxic form that accumulates in fish, shellfish, and animals that consume contaminated water.
To address the issue of mercury emissions, regulations have been implemented to tighten limits on mercury emissions from coal-burning power plants. For example, the Biden administration in 2024 lowered the allowable mercury emissions from lignite coal-burning power plants by 70%. This has resulted in significant reductions in mercury pollution, with a 90% decrease attributed to a combination of pollution-controlling technologies, plant closures, and transitions to cleaner fuel sources.
Despite these efforts, mercury remains a global concern. Human exposure to mercury occurs primarily through the inhalation of elemental mercury vapours during industrial processes and the consumption of contaminated fish and shellfish. The health impacts of mercury exposure are severe, particularly for developing fetuses and young children who are most at risk.
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Burning fossil fuels releases mercury into the atmosphere
Mercury is a naturally occurring chemical element found in rock in the earth's crust. It is also present in fossil fuels, such as coal and oil, and can be released into the atmosphere when these fuels are burned. Human activities, such as the burning of fossil fuels, are responsible for a significant portion of the mercury released into the environment.
The combustion of coal in power plants is a major source of mercury emissions. Coal contains mercury, a neurotoxin that can damage the nervous system, the brain, and other organs. When coal is burned to generate electricity, the mercury is released into the air. Power plants that burn coal to create electricity are the largest source of mercury emissions in the United States, accounting for about 44% of all man-made mercury emissions. The majority of coal-burning power plants emit 5 kilograms of mercury per year, but some plants emit much more. For example, the Martin Lake coal plant in East Texas emitted an estimated 338 pounds of mercury in 2020.
Mercury released from fossil fuel combustion can stay airborne for extended periods and travel long distances. It can eventually settle on land or water, contaminating soils and waterways. Once deposited, certain microorganisms can convert it into methylmercury, a highly toxic form that accumulates in fish, shellfish, and animals that consume fish. Methylmercury can cross the blood-brain and placental barriers, posing significant health risks to humans, especially developing fetuses, young children, and those living near power plants.
To address the issue of mercury emissions from fossil fuel burning, regulations and standards have been implemented to reduce emissions and protect public health. The Clean Air Act, for instance, requires the EPA to review and strengthen standards based on technological advancements. The Biden administration tightened limits on mercury emissions from coal-burning power plants in 2024. Additionally, pollution-control technologies, plant closures, and transitions to cleaner fuel sources have contributed to significant reductions in mercury pollution from coal-fired power plants.
While there have been efforts to mitigate mercury emissions, challenges remain. The Trump administration, for instance, allowed exemptions for certain power plants to exceed air pollution limits, leading to legal actions by organizations such as the NRDC. Additionally, while coal plants have reduced mercury emissions, there are concerns about the impact of these emissions on human health, especially in vulnerable communities near power plants. As such, ongoing efforts and stronger standards are necessary to further minimize and eliminate mercury releases from fossil fuel combustion.
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Mercury can stay airborne for over a year and travel thousands of miles
Mercury is a naturally occurring chemical element found in rock in the earth's crust. It is also found in fossil fuels, such as coal and oil, and can be released into the atmosphere when these fuels are burned. Mercury emissions from the burning of fossil fuels can have significant environmental and health impacts.
Once released into the atmosphere, mercury has the potential to stay airborne for extended periods, travelling thousands of miles before eventually being deposited back to the earth. The duration that mercury remains airborne can vary, but it has been reported to stay airborne for over a year. During this time, mercury can be transported by wind over long distances, dispersing and accumulating in various regions, including remote ecosystems, particularly those in the Arctic Circle.
The ability of mercury to remain airborne and travel vast distances contributes to its global reach and impact. It knows no national or continental boundaries, affecting regions far from the sources of emissions. This characteristic of mercury underscores the importance of international cooperation in addressing mercury emissions and their consequences.
Several factors influence the deposition of airborne mercury. It can fall to the ground through rainfall, dry gaseous deposition, or simply due to gravity (known as "air deposition"). The amount deposited in a given area depends on the local, regional, and global sources of mercury emissions. The deposition of mercury can have significant ecological implications, as it eventually settles into water or onto land, where it can contaminate waterways and impact local ecosystems.
The release of mercury from burning fossil fuels has raised health concerns due to its toxic effects. Mercury deposited on land or water can be converted into methylmercury, a highly toxic form, by certain microorganisms. This methylmercury accumulates in fish, shellfish, and animals that consume contaminated fish, leading to potential health risks for humans who consume these foods. Developing fetuses, young children, and vulnerable communities living near emission sources are particularly susceptible to the harmful effects of mercury exposure.
To mitigate the impact of mercury emissions, regulatory actions have been implemented. For example, the Biden administration tightened limits on mercury emissions from coal-burning power plants in 2024. Additionally, pollution control technologies, plant closures, and transitions to cleaner fuel sources have contributed to significant reductions in mercury pollution from coal-fired power plants. However, ongoing challenges remain, and further efforts are needed to minimize and eliminate mercury releases into the air, water, and land.
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Mercury becomes a harmful toxic, methylmercury, that accumulates in fish and animals
Mercury is a naturally-occurring chemical element found in rock in the earth's crust. It is released into the environment from volcanic activity, weathering of rocks, and as a result of human activity. Human activity is the main cause of mercury releases, particularly coal-fired power stations, residential coal burning for heating and cooking, industrial processes, waste incinerators, and mining for mercury, gold, and other metals.
When fossil fuels such as coal and oil are burned, they release mercury into the atmosphere. There, it can stay airborne for over a year and travel to remote ecosystems, especially in the Arctic Circle. Mercury in the upper atmosphere is relatively harmless to humans. However, when mercury undergoes a chemical reaction with sunlight and other elements such as oxygen, sulfur, and bromine, it becomes a type of salt. This salt dissolves in water vapour and falls to the earth as rain, soaking into the soil and washing into waterways.
Once mercury is released into the environment, certain microorganisms in the soil and aquatic environments can convert it into methylmercury, a highly toxic form of mercury. Methylmercury bioaccumulates in fish and shellfish, with larger predatory fish having higher levels of mercury due to consuming many smaller fish. This bioaccumulation can cause high levels of mercury in top predator fishes, which can be detrimental to humans and fish-eating wildlife when consumed.
Methylmercury is very toxic to humans, with potential harmful effects on the nervous, digestive, and immune systems, as well as the lungs, kidneys, skin, and eyes. It can easily cross the blood-brain and placental barriers, accumulating in the bodies of animals and humans. Most human exposure to mercury occurs through the consumption of contaminated fish and shellfish.
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Mercury exposure is dangerous to human health, especially for developing fetuses and young children
Mercury is a naturally occurring chemical element found in rock in the Earth's crust, including in deposits of coal and other fossil fuels. When fossil fuels are burned, mercury is released into the atmosphere and can have detrimental effects on human health, especially for developing foetuses and young children.
Methylmercury, formed when mercury in the air combines with water, is a powerful neurotoxin. Exposure to high levels of methylmercury can lead to adverse health effects, with symptoms including muscle weakness. Methylmercury is commonly ingested by consuming fish and shellfish with high levels of methylmercury in their tissues. These include large fish such as swordfish, shark, king mackerel, and tilefish. Almost everyone has at least small amounts of methylmercury in their bodies due to its widespread presence in the environment.
Developing foetuses are particularly vulnerable to the harmful effects of methylmercury. When pregnant women consume fish and shellfish with high mercury levels, the neurotoxin can be passed on to the foetus, damaging the unborn infant's growing brain and nervous system. Exposure to methylmercury during this critical period of brain development can result in long-term impacts on cognitive thinking, memory, attention, language, fine motor skills, and visual-spatial skills.
Children exposed to high levels of mercury may experience similar neurological effects, including impaired cognitive function and problems with memory, attention, language, and motor skills. In addition, high mercury exposure can cause kidney damage and respiratory failure in both children and adults.
To minimise the risk of mercury exposure, it is recommended to avoid consuming fish with high mercury levels, especially during pregnancy. It is also crucial to be cautious when handling products containing metallic mercury, such as old thermometers and fluorescent light bulbs, as spills or breakage can release mercury vapour into the air, leading to inhalation and potential health risks.
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Frequently asked questions
Yes, mercury is emitted when fossil fuels like coal and oil are burned.
Mercury occurs naturally in coal and other fossil fuels. When these fuels are burned, the mercury becomes airborne and goes into the atmosphere.
Mercury can stay in the atmosphere for over a year and travel long distances, eventually settling on land or water. Once deposited, microorganisms can convert it into methylmercury, a highly toxic form that accumulates in fish, shellfish, animals, and humans.
Exposure to mercury has toxic effects on human health, particularly for developing fetuses, young children, and vulnerable communities near emission sources. Methylmercury can cross the blood-brain and placental barriers, causing brain damage and increasing the risk of heart disease and other serious health issues.
