Environmental

Urea-formaldehyde foam insulation (UFFI) used in homes is a concern because it:

AContains asbestos fibers
BOff-gases formaldehyde, which can cause health problems✓ Correct
CAbsorbs radon gas and concentrates it
DCreates mold growth when wet

Explanation

Urea-formaldehyde foam insulation can off-gas formaldehyde, a chemical that can irritate the eyes, nose, and throat and may be carcinogenic. UFFI was used in homes during the 1970s and was banned by the CPSC (though the ban was later overturned).

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