Welcome to the Association of Vapor Intrusion Professionals

AVIP is a community of professionals dedicated to advancing the industry and science of vapor intrusion. The purpose of this association is to promote the establishment of accepted and recognized best practices for vapor intrusion professionals, provide contextual knowledge, and serve as a resource of information for the general public.

UPCOMING EVENTS

4th Annual AVIP VI Conference | October 12-15, 2025 | Austin, TX

Toronto Vapour Intrusion Conference | May 21, 2025 | Brampton, ON

Learn more from our events page!

AVIP Best Practices

The Association of Vapor Intrusion Professionals (AVIP) is working in collaboration with a variety of stakeholders (e. g., regulators, environmental consultants, mitigation specialists, insurance providers, academia, laboratories, attorneys, etc.,) to develop a series of peer-reviewed best practice documents for the vapor intrusion industry.

The Benefits of Membership

  • Increased Visibility in the Industry 
  • Searchable Profile - "Find a Professional"
  • A Voice in standards of practice for federal and state regulations
  • VI Community 
  • Access to updated Regulations and Standards 
  • State and Local Government Contact Information for VI
  • Training
  • Certification
  • Search for VI Vendors/Suppliers
  • Discount on AVIP Conferences
  • Discount on All Training
  • Networking Events
  • Member Events
  • Locate a Member
  • Sign up for Alerts
  • Use of the Approved AVIP Logo Badge for Members and Sponsors
Join now!

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 1980s with concerns over radon intrusion. Subsequently, there was an increasing awareness that anthropogenic chemicals (e.g., petroleum hydrocarbons and chlorinated solvents) in soil, groundwater, and sewers and drainlines could also pose threats to indoor air quality via the vapor intrusion pathway.

Vapor-forming chemicals may include:

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