What Is Vapor Intrusion?Vapor intrusion occurs when there is a migration of vapor-forming chemicals from any subsurface source into an overlying building. Recognition of soil vapor intrusion to buildings and other enclosed spaces occurred in the ![]() Vapor-forming chemicals may include:
In extreme cases, the vapors may accumulate in dwellings or occupied buildings to levels that may pose:
In buildings with lower concentrations of vapor-forming chemicals arising from vapor intrusion, the main concern is whether the chemicals may pose an unacceptable risk of health effects due to long-term (i.e., chronic) exposure to these lower levels. A complicating factor in evaluating the potential chronic risk from vapor intrusion is the potential presence of some of the same chemicals from emission sources in the building
that may pose, separately or in combination with vapor intrusion, a significant human health risk. If you have concerns about vapor intrusion or indoor air quality where you live or work, please contact your state health department. |