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Lead is a naturally occurring toxic metal found in the Earth's crust. It is a pollutant that can be released directly into the air as suspended particles. Sources of lead emissions vary from one area to another, but major sources include ore and metal processing, piston-engine aircraft operating on leaded aviation fuel, waste incinerators, utilities, and lead-acid battery manufacturers. Lead can also be found in products like paint, ceramics, pipes, plumbing materials, solder, gasoline, batteries, ammunition, and cosmetics. Lead may enter the environment from these past and current uses, as well as from industrial sources and contaminated sites. Human activities, such as the past use of leaded gasoline and certain types of industrial facilities, have contributed to lead pollution. Lead is particularly harmful to children, who are more vulnerable to its toxic effects and can suffer permanent adverse health impacts, including on the development of the central nervous system.
| Characteristics | Values |
|---|---|
| Sources of lead emissions | Ore and metals processing, piston-engine aircraft operating on leaded aviation fuel, waste incinerators, utilities, lead-acid battery manufacturers, lead smelters, and industrial sources |
| Human exposure | Inhalation, ingestion of contaminated soil or other surfaces, eating and drinking food or water containing lead, using dishes or glasses that contain lead, and exposure to lead-based paint |
| Health effects | Adverse effects on the nervous system, kidney function, immune system, reproductive and developmental systems, and cardiovascular system. Increased risk of high blood pressure, cardiovascular problems, and kidney damage. Particularly dangerous for children, causing potential behavioral problems, learning deficits, lowered IQ, and permanent adverse health impacts on the central nervous system. |
| Environmental effects | Losses in biodiversity, changes in community composition, decreased growth and reproductive rates in plants and animals, neurological effects in vertebrates |
| Prevention and mitigation | Federal and state regulatory standards, chelation therapy, biological remediation, phase-out of lead in gasoline, lead-safe work practices during home renovations |
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What You'll Learn
Industrial sources and contaminated sites, e.g. former lead smelters
Lead is a naturally occurring element found in small amounts in the Earth's crust. While lead has some beneficial uses, it is toxic to humans and animals. Lead can be found in the air, soil, water, and even inside homes. Much of the lead in the environment is a result of human activities, including the use of fossil fuels, industrial facilities, and the past use of lead-based paint in homes.
Industrial Sources and Contaminated Sites
Industrial activities such as ore and metal processing, battery manufacturing, and waste incineration are significant sources of lead emissions. Lead is released into the atmosphere during these industrial processes and can travel long distances before settling onto the ground, where it contaminates soil particles. Lead may then make its way into groundwater, depending on the type of lead compound and soil characteristics.
One of the most prominent industrial sources of lead pollution is lead smelting. Smelting is a process used to extract pure lead from ore or to recycle lead from used products and scrap metal. Both primary and secondary smelting processes release large amounts of lead into the surrounding environment. Lead smelters often create areas of high lead pollution, with the highest air concentrations of lead found near these facilities.
In areas with little to no government regulation, many smelting plants forgo important safety measures to control and monitor pollution levels due to the associated costs. This has resulted in the creation of large areas of legacy pollution, particularly affecting older lead smelters that have been in operation for decades.
An example of the impact of lead smelters is seen in Mombasa, Kenya, where elevated levels of lead were found in the soil and dust of a community near a lead smelting facility. Another instance is in northwestern India, where a lead smelter has contaminated drinking and bathing water for nearby residents, with lead levels over eight times the health standard.
Preventative Measures
Federal and state regulatory standards have helped reduce lead levels in the environment, including air, water, soil, consumer products, and food. Working with governments, NGOs, and communities to update equipment and operations at smelting plants is an effective way to reduce lead pollution. Remediation efforts in contaminated areas involve removing and disposing of contaminated soil and ensuring water and food safety.
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Lead-based paint in homes
Lead is a naturally occurring toxic metal found in the Earth’s crust. It has been used in a wide variety of products, including paint, ceramics, pipes and plumbing materials, solders, gasoline, batteries, ammunition, and cosmetics. Lead-based paint in homes is a major source of lead exposure and can pose serious health risks, especially to children.
Before the harmful effects of lead were widely understood, lead was commonly used in paint. Approximately three-quarters of homes built before 1978 in the US contain some lead-based paint. In 1978, the US Consumer Product Safety Commission banned the use of lead-based paint in housing. While properly maintained and managed lead paint poses little risk, it can become hazardous when it peels, deteriorates, or turns into fine dust. This dust can settle on various surfaces and objects, such as carpets, floors, furniture, and toys, and can be ingested or inhaled by both children and adults.
Children are particularly vulnerable to lead poisoning as they may absorb up to 4–5 times as much lead as adults from an ingested dose. Their innate curiosity and frequent hand-to-mouth behaviours increase their risk of exposure to lead-contaminated dust and paint. Lead exposure can cause permanent adverse health effects, particularly on the central nervous system, and can result in reduced fetal growth and preterm birth during pregnancy.
If you suspect your home may contain lead-based paint, you can purchase do-it-yourself test kits from home centres, paint stores, and ceramics supply outlets. These kits can help you determine the presence of lead, but they may not distinguish between low and high levels, and accurate readings can be difficult with multiple layers of paint. It is recommended to consult with professionals and follow specified cleaning techniques, good nutrition, and, in some cases, permanent measures such as component removal, paint removal, and covering painted surfaces.
To reduce the risk of lead exposure, it is important to maintain good hygiene practices, such as regularly washing children's hands, bottles, pacifiers, and toys. Encouraging children to wash their hands after playing outdoors and removing their shoes can also help minimise the risk of lead exposure. Additionally, ensuring that your family members maintain a well-balanced diet can help, as children with healthy diets absorb less lead.
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Leaded aviation fuel
Avgas often contains tetraethyl lead (TEL), a toxic lead-containing additive used to aid in engine lubrication, increase octane rating, and prevent engine knocking. One gram of TEL contains 640.6 milligrams of lead. While the use of TEL has been banned from automotive fuel since the 1970s, it has not been banned from avgas due to operational safety concerns. Lower-octane fuels can lead to engine failure, and the alloys used in aviation engine construction are chosen specifically for their synergy with lead.
There are ongoing efforts to reduce or eliminate the use of lead in aviation gasoline. The Federal Aviation Administration (FAA) has approved the use of unleaded aviation fuels, such as G100UL and UL94, and is working to expand their availability. The FAA has also established initiatives to develop a safe unleaded replacement aviation gasoline, with the goal of achieving a lead-free aviation system by 2030. However, finding a suitable replacement for all piston-engine aircraft has proven challenging, and the phase-out of 100LL leaded fuel has been called "one of modern GA's most pressing problems".
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Lead in drinking water
Lead is a naturally occurring element found in the Earth's crust. While it has some beneficial uses, it is toxic to humans and animals. Lead can be found in the air, soil, water, and even inside homes. Human activities, such as the use of fossil fuels, industrial facilities, and lead-based paint, have contributed to lead contamination in the environment.
While steps have been taken to reduce lead levels in water, it may still be present in older metal faucets, taps, or pipes, particularly in homes built before 1986. Lead services lines, which connect the home to the water main, are often the most significant source of lead in the water. Homes without lead service lines may still have brass or chrome-plated brass faucets and plumbing with lead solder, which can also contribute to lead contamination.
To ensure safe drinking water, it is recommended to contact a licensed plumber or the water utility company to determine if the pipes or service lines contain lead. Testing is the only sure way to detect lead in water, as it cannot be seen, tasted, or smelled. It is also advised to use only cold water for drinking, cooking, and making baby formula, as hot water can dissolve lead more easily.
The presence of lead in drinking water poses a serious health risk. Lead exposure can cause adverse effects on the nervous system, kidney function, immune system, reproductive and developmental systems, and the cardiovascular system. There is no known safe level of lead exposure, and it can accumulate in the body over time, especially in the bones and teeth. Young children are at a higher risk of lead poisoning due to their developing organs and age-appropriate behaviours, such as putting objects and hands in their mouths.
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Lead in soil
Lead is a naturally occurring element found in small amounts in the earth’s crust. While it has some beneficial uses, it is toxic to humans and animals. Lead can be found in the soil, air, water, and even inside homes. Human activities, including the use of fossil fuels, industrial facilities, and waste incineration, have led to elevated levels of lead in the environment.
Sources of Lead in the Soil
Natural levels of lead in soil range between 50 and 400 parts per million. However, human activities have significantly increased lead concentrations in the environment, especially near mining, smelting, and refining sites. Lead emitted into the air from industrial sources or spark-ignition engine aircraft can travel long distances before settling onto the ground, where it typically adheres to soil particles.
Lead-contaminated soil poses a significant health risk, especially to children, who are more susceptible to lead poisoning due to their developing bodies and innate curiosity. Children can be exposed to lead in soil by swallowing or breathing in lead-contaminated dust or soil while playing outdoors. They may also be exposed by eating fruits and vegetables grown in contaminated soil or bringing lead-contaminated soil particles indoors on their clothes, shoes, or pets.
Preventing Lead Exposure from Soil
To reduce the risk of lead exposure from soil, it is recommended to:
- Cover bare soil with grass, mulch, wood chips, or other ground coverings.
- Prevent children from playing on bare soil and provide alternative play areas with appropriate ground cover.
- Wash children's hands, bottles, pacifiers, and toys frequently to remove any lead residue.
- Teach children to remove their shoes and wash their hands after playing outdoors to avoid bringing lead into the home.
- Avoid growing fruits or vegetables in lead-contaminated soil, and thoroughly wash produce with a vinegar solution if lead contamination is suspected.
- Contact a healthcare provider if you suspect lead exposure and consider having your soil and home tested for lead.
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Frequently asked questions
Lead is a toxic heavy metal and environmental pollutant. It is present in the air, soil, water, and food. Major sources of lead in the air include ore and metals processing, piston-engine aircraft operating on leaded aviation fuel, waste incinerators, utilities, and lead-acid battery manufacturers. Lead in the soil comes from industrial sources, mining, and car exhausts. Lead can enter water bodies through the direct discharge of waste streams, and lead can also be found in certain foods, such as candy, wrappers, pottery containers, and some ethnic foods.
Lead from industrial sources, such as smelters, can be emitted into the air and then settle on the ground, where it sticks to soil particles. Wind can stir up lead-contaminated soil and blow it into homes and yards. Lead can also be released into water supplies through the corrosion of materials containing lead in plumbing systems.
Lead-based paint is a significant source of lead exposure, especially during home renovations when paint flecks or chips can be ingested, particularly by young children. Flaking lead-based paint on the outside of buildings can mix with the surrounding soil, and lead from indoor paint can become suspended in the air. Globally, 48% of countries have legally binding controls on lead paint.
