Environmental

Urea-formaldehyde foam insulation (UFFI) was used in some West Virginia homes during the 1970s and is a concern because:

AIt is a fire accelerant
BIt can off-gas formaldehyde, a potential carcinogen, especially when it deteriorates✓ Correct
CIt causes structural damage to walls
DIt was banned for environmental reasons unrelated to health

Explanation

UFFI can release formaldehyde gas as it deteriorates. Formaldehyde is classified as a probable human carcinogen and can cause respiratory irritation.

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