Environmental

Formaldehyde is a common indoor air quality concern in homes primarily because it is found in:

ACopper plumbing pipes
BPressed wood products, adhesives, and some insulation materials✓ Correct
CAsphalt roof shingles
DConcrete foundation materials

Explanation

Formaldehyde off-gasses from pressed wood products (particleboard, plywood, MDF), adhesives, and some insulation, particularly urea-formaldehyde foam. It is a known carcinogen and indoor air pollutant.

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