Environmental
Formaldehyde is an indoor air quality concern in Pennsylvania homes primarily from:
AOutdoor air infiltration from industrial areas
BOff-gassing from composite wood products (particleboard, plywood) and certain insulation products✓ Correct
CNaturally occurring soil gas like radon
DMunicipal water supplies
Explanation
Formaldehyde off-gasses from composite wood products (particleboard, MDF, plywood), formaldehyde-based resins in carpeting, and some foam insulation. It is a respiratory irritant and potential carcinogen.
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