Final answer:
Asbestos is the insulation material in older homes linked to cancer, especially lung cancer. Its use is now restricted due to health risks. Other indoor air pollutants such as secondhand smoke, carbon monoxide, and radon also pose serious health concerns.
Step-by-step explanation:
Insulation Material Linked to Cancer
The insulation material in older homes that is now linked to cancer is asbestos. Asbestos was commonly used in buildings for its fire-resistant qualities. However, as the dangers of asbestos became evident, particularly its link to lung cancer and other lung diseases, its use has been heavily restricted. When asbestos fibers become airborne, typically during renovation or demolition of old buildings, they can be inhaled, leading to serious health issues such as mesothelioma, asbestosis, and lung cancer. It is essential to handle asbestos with proper safety measures and only by trained professionals to minimize exposure. In addition to asbestos, other air pollutants that can pose health risks include secondhand smoke, carbon monoxide, dry cleaning fluids, and radon that can accumulate in well-sealed buildings, increasing the risk of lung cancer. These substances highlight the importance of good indoor air quality and the potential risks associated with various building materials and environmental factors.