Environmental

In Montana, 'naturally occurring asbestos' (NOA) may be found near:

AOnly in manufactured building materials installed before 1980
BCertain geological formations (serpentinite, ultramafic rocks) found in various parts of the state, including parts of the Libby area✓ Correct
COnly near former asbestos mining operations in other states
DExclusively in urban areas from building demolition

Explanation

Montana's Libby area has been significantly affected by naturally occurring asbestos (tremolite) contamination from the Libby vermiculite mine. NOA also occurs near other geological formations.

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