This website provides some key information on vapor intrusion for members of the general public and environmental professionals. In addition to basic information about vapor intrusion, the site contains technical and policy documents, tools and other resources to support vapor intrusion environmental investigations and mitigation activities.
If you have concerns about vapor intrusion where you live or work, please contact your state health department.
EPA Technical Documents, Tools and Other Resources to Support Vapor Intrusion Assessment and Mitigation Activities
- Technical Guide for Assessing and Mitigating the Vapor Intrusion Pathway from Subsurface Vapor Sources to Indoor Air (June 2015)
- Technical Guide For Addressing Petroleum Vapor Intrusion At Leaking Underground Storage Tank Sites. (June 2015)
- OUST's Petroleum Vapor Intrusion Compendium
- Background Indoor Air Concentrations of Volatile Organic Compounds in North American Residences (1990 – 2005): A Compilation of Statistics for Assessing Vapor Intrusion.
- EPA's Vapor Intrusion Database: Evaluation and Characterization of Attenuation Factors for Chlorinated Volatile Organic Compounds and Residential Buildings.
- Conceptual Model Scenarios for the Vapor Intrusion Pathway.
- Indoor Air Vapor Intrusion Mitigation Approaches.
- Vapor Intrusion Screening Levels
- Petroleum Hydrocarbons And Chlorinated Hydrocarbons Differ In Their Potential For Vapor Intrusion.
- EPA Spreadsheet for Modeling Subsurface Vapor Intrusion
- Vapor Intrusion Database - Contains site-specific measurements of vapor attenuation factors, which express the reduction in vapor concentrations as volatile contaminants move from sub-surface sources into indoor air.
The Brownfields and Land Revitalization Technology Support Center has developed a primer for land revitalization stakeholders concerned about vapor intrusion, including property owners, municipalities, and real estate developers; see Brownfields Technology Primer: Vapor Intrusion Considerations for Redevelopment (PDF) (49 pp, 1.2MB, About PDF) . This document provides an overview of vapor intrusion and how it can affect redevelopment. It also summarizes techniques for quickly and cost effectively assessing the potential for vapor intrusion, which can be implemented in consultation with qualified scientists and engineers.
EPA HRS Rule-Making Effort
EPA is working toward a proposed rulemaking to add a new screening component to OSWER's Hazard Ranking System (HRS), which would allow sites impacted by vapor intrusion or intrusion of other subsurface contamination to be evaluated for placement on the Superfund National Priorities List (NPL). Through this change, the HRS could directly consider the human exposure to contaminants that enter building structures from the subsurface environment.
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