What are “asbestos-containing materials” (ACMs)?

"Asbestos-containing materials" refers to any building materials that contain more than 1% asbestos by weight. This definition is significant because it establishes a clear threshold for identifying materials that pose a risk due to the presence of asbestos fibers, which can be hazardous when disturbed or improperly handled.

Understanding this definition is crucial for anyone involved in the handling or abatement of asbestos. Materials that exceed this threshold require specific regulations and handling procedures to ensure safety for workers and the general public. The concentration of more than 1% is used because research has shown that even small amounts of asbestos can be hazardous, leading to serious health issues such as asbestosis, lung cancer, and mesothelioma.

The other options are misrepresentations of what constitutes ACMs. Materials that are "safe to touch," those that have had asbestos fibers removed, and materials used in modern construction do not accurately describe ACMs, as they do not necessarily meet the specific criteria of containing asbestos at or above the specified percentage.