Final answer:
Toxic materials like lead and asbestos can be released into the air during sanding and activities like demolition work or remodeling, posing serious health risks.
Step-by-step explanation:
Toxic materials such as lead and asbestos are most likely to be released from painted surfaces into the air during sanding and demolition work or remodeling activities. When lead-based paints are disturbed, for example by dry sanding, they can create harmful lead dust that poses a risk of lead poisoning, particularly to children who may ingest or inhale these particles. Similarly, when asbestos-containing materials are disturbed, asbestos fibers can be released into the air, leading to serious health issues including lung cancer, mesothelioma, and asbestosis. It is important for people to take preventive measures such as using lead-safe certified professionals for renovation work, and to undergo cleaning and dietary practices that reduce the risk of exposure.