Environmental
Asbestos-containing materials in a building pose the greatest health risk when:
AThey are intact and undisturbed
BThey are friable (crumbling or easily reduced to powder), releasing fibers into the air✓ Correct
CThey have been painted over
DThey are located outside the building
Explanation
Asbestos is most dangerous when it becomes 'friable' — meaning it crumbles easily or can be reduced to powder, releasing microscopic fibers into the air. Inhaling asbestos fibers can cause serious lung diseases including mesothelioma and asbestosis.
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