Final answer:
Historically, lead-based paint and leaded gasoline were major sources of exposure. Today, lead can still be found in water, toys, and through work or hobby-related activities. Prevention and treatment, such as chelation therapy for high blood lead levels, are key to managing lead exposure.
Step-by-step explanation:
The main sources of lead exposure in the past were from lead-based paint and lead-contaminated gasoline. Homes built before 1978 are likely to contain lead-based paint, and as the paint deteriorates, it can create lead dust which is a major exposure risk. Additionally, occupational exposure in certain jobs can lead to adults bringing lead into the home on their clothing or equipment. Today, people can still be exposed to lead through various sources including contaminated water, certain types of toys and jewelry, imported candies, as well as from certain jobs and hobbies. Exposure to lead is especially concerning for pregnant women as it can cross the placenta and also be passed through breast milk. Lead poisoning is preventable and actions such as removing lead-containing items, improved ventilation in the workplace, and policies banning lead in products have been implemented. For those with high blood lead levels, chelation therapy is a treatment used to help eliminate lead from the body.