Exposure to lead and mercury from e‑waste can cause serious, sometimes long‑lasting damage to the body, especially in children, pregnant women, and workers in informal recycling sites. Both metals are neurotoxic, meaning they attack the brain and nervous system, but they also harm other organs and body systems over time. When electronics containing these metals are burned, broken, or left in open dumps, lead and mercury can enter air, soil, dust, and water, creating a wide exposure risk for nearby communities.

Health effects of lead exposure from e‑waste

Lead is present in older cathode‑ray‑tube (CRT) TVs and monitors, some circuit boards, and solder in many electronic devices. Informal e‑waste recycling often crushes, burns, or melts these materials, releasing lead dust and fumes.

Key health effects include:

  • Neurological and developmental damage in children: Elevated blood lead levels are linked to reduced IQ, learning disabilities, attention problems, hyperactivity, and behavioural issues. Studies in e‑waste communities show children with higher lead exposure scoring lower on cognitive and language tests.

  • Damage to the nervous system in adults: Long‑term exposure can cause headaches, fatigue, irritability, muscle weakness, and numbness or tingling, especially in the hands and feet.

  • Kidney and cardiovascular effects: Chronic lead exposure is associated with kidney dysfunction, high blood pressure, and increased risk of heart disease.

  • Reproductive risks: Pregnant women exposed to lead are at higher risk of miscarriage, premature birth, low birth weight, and impaired neurodevelopment in the unborn child.

  • Acute poisoning at high doses: In cases of very high exposure, lead can cause severe abdominal pain, vomiting, convulsions, coma, and even death.

Health effects of mercury exposure from e‑waste

Mercury appears in some LCD backlighting, switches, and older electronic devices. When these items are burned or broken in informal e‑waste operations, mercury vapor and compounds can be inhaled or settle into dust and water.

Primary health effects include:

  • Nervous‑system damage: Mercury is a powerful neurotoxin that can impair memory, coordination, and fine motor skills, and cause tremors, emotional instability, and mood changes.

  • Developmental harm in fetuses and children: Prenatal and early‑life mercury exposure is strongly linked to delayed cognitive and motor development, reduced IQ, and attention problems.

  • Kidney and lung damage: Inhaled mercury vapor can damage the lungs, while long‑term exposure is associated with kidney injury and impaired kidney function.

  • Eye and skin irritation: Direct contact with mercury compounds can cause skin rashes, eye irritation, and other local inflammatory effects.

Who is most at risk?

People most vulnerable to lead and mercury from e‑waste include:

  • Children and unborn babies: Their developing brains and organs are extremely sensitive to low levels of these metals.

  • Pregnant women: Exposure can cross the placenta, affecting fetal growth and long‑term neurodevelopment.

  • E‑waste workers and nearby residents: Those handling e‑waste without proper protective equipment, especially in informal recycling “dumpsites,” often show elevated blood lead and mercury levels.

Why proper e‑waste handling matters

Because of these health risks, the World Health Organization (WHO) and other bodies stress that e‑waste must be recycled in controlled, licensed facilities instead of being burned or dumped. Proper e‑waste recycling contains lead and mercury safely, recovers valuable materials, and protects both human health and the environment. For households and businesses in Nairobi and other urban areas, this means taking old electronics to certified e‑waste handlers rather than giving them to informal scrap collectors or throwing them in the regular bin.

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