Environmental

Wisconsin's 'vapor intrusion' is a concern in real estate when:

AExterior paint contains lead
BVolatile contaminants in soil or groundwater migrate into buildings as vapor, potentially affecting indoor air quality✓ Correct
CRadon enters through cracks in the foundation
DMold spores enter through HVAC systems

Explanation

Vapor intrusion occurs when volatile chemical contaminants in soil or groundwater migrate upward as vapor into overlying buildings, potentially creating indoor air quality problems — a concern on contaminated sites.

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