According to the EPA’s website, 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 1980s with concerns over radon intrusion. Subsequently, there was an increasing awareness that anthropogenic chemicals (e.g., petroleum hydrocarbons and chlorinated solvents) in soil, ground water, and sewers and drainlines could also pose threats to indoor air quality via the vapor intrusion pathway.
In extreme cases, the vapors may accumulate in dwellings or occupied buildings to levels that may pose: near-term safety hazards (e.g., explosion) and acute health effects.
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
(i.e. household solvents, gasoline, and cleaners) that may pose, separately or in combination with vapor intrusion, a significant human health risk.
You can learn more about Vapor Intrusion at the EPA’s website at: https://www.epa.gov/vaporintrusion/what-vapor-intrusion
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