Environmental · Defined
Vapor intrusion
Movement of vapors from a subsurface source into an overlying or nearby building.
Why it matters
A subsurface concern does not by itself establish indoor exposure. Evaluation may require multiple lines of evidence, appropriate sampling, and consideration of indoor sources.
In practice
A project example
A nearby solvent release prompts evaluation of whether vapors could migrate beneath an occupied property.
Technical references
General educational guidance from KOW Building Consultants. Examples are illustrative, not project records. The applicable contract, standard, program, and jurisdiction control the requirements for a specific assignment.