What is lead and where is it found?
Lead is a heavy, soft bluish-grey metal that occurs naturally in the earth’s crust in small amounts (average concentrations of 5-50 micrograms per kilogram). Much higher concentrations are found in lead ores. Lead is toxic to the brain and nervous system of adults and children. It is most often found in old paint, the pipes of old homes built before the mid-1950s, and some consumer products.
What are the sources of lead exposure?
Humans are exposed to lead in both outdoor and indoor environments. It is found in the air, soil, dust, drinking water, food and various consumer products (including paint and older or improperly manufactured children’s toys).
What are the health effects at different lead levels?
The latest medical and scientific research shows that absorption of even very low levels of lead into the blood may have harmful health effects on the intellectual and behavioural development of infants and young children. Blood lead levels in the range of 10 to 15 micrograms per decilitre in fetuses, infants, and children have been associated with adverse behavioural and cognitive changes. When blood lead levels exceed 40 micrograms per decilitre, there is a decrease in the body’s capacity to produce red blood cells.
What are the routes of exposure to lead for children and adults?
Lead may enter the body through the mouth (ingestion), the lungs (inhalation) or the skin (dermal route). A growing fetus may also be exposed to lead from their parent through the placenta. For the general population in Canada, the main exposure routes are through ingestion or inhalation. The most common route of entry is ingestion, except in industrial environments, where inhalation of lead fumes may play a larger role. Absorption of lead through the skin is rare.
Children are at greater risk of ingesting lead due to their frequent hand-to-mouth activity and normal tendency to mouth or chew objects they have contact with (especially non-food products such as paint chips, furniture or toys).
What is lead “poisoning” compared to lead “exposure”?
Lead exposure refers to the entry of lead into the body, through ingestion, inhalation, the skin or the placenta. Lead poisoning occurs when there are adverse health effects due to lead in the body.
Can I watch for noticeable and visible signs/symptoms of lead poisoning?
Some of the more prominent symptoms of lead poisoning include headaches, irritability, abdominal pain, vomiting, anemia (general weakness, paleness), weight loss, poor attention span, noticeable learning difficulty, slowed speech development and hyperactivity. However, at very low exposure levels, lead may not produce specific symptoms, but still can produce subtle adverse effects on children’s development.
What can you do to reduce your/your family’s exposure to lead
- Clean your house regularly to remove dust and particles that may contain lead. This is especially important for surfaces that young children might touch often.
- Do not keep food or drinks in lead crystal containers for any length of time. Do not serve pregnant people or children drinks in crystal glasses. Babies should never drink from lead crystal.
- If you own glazed glass or ceramic dishes bought outside of Canada, do not use them for serving food or drinks. They may contain higher levels of lead than are allowed in Canada.
- If you have children six years of age or under, remove any horizontal PVC (plastic) mini-blinds made in Asia or Mexico from your home.
- Discourage children from putting things into their mouths unless they are intended to be mouthed (like food and pacifiers).
- If you work in a smelter, refinery or any other industry where you are exposed to high levels of lead, shower and change your clothing before going home. Make sure you have your blood lead level checked regularly.
- Never burn waste oil, coloured newsprint, battery casings or wood covered with lead paint in or near your home, because lead fumes may be released. Dispose of them through your city or town’s hazardous waste program.
- If you use lead solder in a hobby (like making stained glass), use a good quality breathing mask, keep surfaces clean, and keep children and pregnant people out of the area. Wash hands after handling lead solder.
- Avoid eating wild game that has been shot with lead bullets. Use non-lead bullets and shot when hunting for food.
- If you are concerned about potential exposure to lead, speak to your health care provider.
Other Questions?
Talk to your health care provider or call the HPEPH Healthy Environments team at 613-966-5500, ext. 677 or 1-800-267-2803, ext. 677; TTY Dial 711 (1-800-267-6511)
References
- Health Canada – Lead Information Package – Some Commonly Asked Questions About Lead and Human Health, October 2021
- Health Canada, Lead – Information sheet, July 2020
- Health Canada, Home Safety – Lead-based Paint, February 2023
- Toronto Public Health – Health Impacts of Lead
- Province of Manitoba, Lead Factsheet, July 2018
