Vapor intrusion (VI) is a process by which chemicals in soil or groundwater migrate to indoor air above a contaminated site. Vapor Intrusion is an emerging concept, the United States Environmental Protection Agency having only issued a draft guidance on the subject in 2002. On June 1, 2010, ASTM International released the "Standard Guide for Vapor Encroachment Screening on Property Involved in Real Estate Transactions," (ASTM E 2600-10).
In the United States, vapor intrusion  is handled in individual states in different ways. One of the most scrupulous guidance documents on vapor intrusion in the nation is from the New York Department of Health.
- Superfund for a list of Environmental Protection Agency Superfund sites
- Volatile Organic Compounds (VOCs) to learn more about the organic chemical compounds covered in the category.
- Trichloroethylene (TCE) for a discussion of the chemical compound
- Henshaw, Stephen. "Vapor Intrusion: What is it and How Can it Affect Me?" Western Cleaner & Launderer, November 2008.
- "OSWER Draft Guidance for Evaluating the Vapor Intrusion to Indoor Air Pathway from Groundwater and Soils (Subsurface Vapor Intrusion Guidance)". Environmental Protection Agency. 2002-11-29.
- "ASTM E2600-10 Standard Guide for Vapor Encroachment Screening on Property Involved in Real Estate Transactions". ASTM International.
- Guidance for Evaluating Soil Vapor Intrusion in the State of New York
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