What is vapor intrusion?
Migration of Soil Vapors to Indoor Air
This figure depicts the migration of volatile chemicals from contaminated soil and groundwater plumes into buildings. Volatile chemicals are shown to enter buildings through cracks in the foundation and openings for utility lines. Atmospheric conditions and building ventilation are shown to influence vapor intrusion.
Vapor Intrusion; US Environmental Protection Agency. Accessed July 2016
Vapor intrusion occurs when vapors from volatile organic and/or inorganic compounds migrate into buildings from contaminated groundwater or soil. Vapor intrusion can cause potentially unhealthy levels of hazardous substances in indoor air.
Ecology developed draft technical guidance, which provides techniques for evaluating whether vapor intrusion could contaminate indoor air. The draft guidance also recommends ways to protect people in impacted buildings.
Ecology is reviewing and updating the draft guidance, and will work to develop new guidance during the next several years.
Key Ecology documents
EPA guidance documents related to vapor intrusion:
This page last updated July 26, 2016
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