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.

Keynote Speaker Announced for Upcoming Conference!

The 5th AVIP VI Conference is honored to welcome Matthew Lahvis as the Keynote Speaker for the 2026 conference, taking place October 11–14, 2026 in Orlando, Florida. 

Matt is a Principal Soil and Groundwater Scientist at Shell Oil Products US where he provides technical leadership on soil and groundwater issues associated with oil and gas operations. His work focuses on petroleum chemical fate and transport, vapor intrusion science, risk-based environmental management, and remediation strategies for contaminated sites.

Matt is widely recognized for his contributions to the science and policy surrounding petroleum vapor intrusion (PVI). His research has helped inform major regulatory frameworks, including California’s Low-Threat Underground Storage Tank Closure Policy and petroleum vapor intrusion guidance developed by the U.S. Environmental Protection Agency (EPA) and the Interstate Technology & Regulatory Council (ITRC).

In addition to his research contributions, Matt has served as a technical advisor supporting vapor intrusion guidance development in the United States, the United Kingdom, Australia, and Canada, helping shape best practices used by regulators, consultants, and industry worldwide.

Matt is also an active member of the American Petroleum Institute’s Soil and Groundwater Task Force and has been recognized by the Interstate Technology & Regulatory Council (ITRC) as the Industry Affiliates Program Member of the Year for his contributions to advancing environmental science and regulatory collaboration.

He currently serves as an Associate Editor for the Groundwater Monitoring & Remediation journal and has authored numerous scientific papers and a book chapter on vapor intrusion. Over his career he has received several honors, including awards from the U.S. EPA Office of Underground Storage Tanks, the Association for Environmental Health and Sciences (AEHS), ASTM International, and Shell recognizing his leadership and scientific contributions to environmental protection.

Prior to joining Shell, Matt worked for 11 years with the U.S. Geological Survey (USGS) in the New Jersey District Office, where he developed the open-source R-UNSAT reactive transport model for unsaturated-zone processes. He also served as an Adjunct Professor at Drexel University, where he earned his PhD in Civil Engineering.

We are honored to have Matt join the AVIP VI Conference community and look forward to the insights he will share with environmental professionals working in vapor intrusion, contaminated site management, groundwater science, and environmental remediation.

Key Details: 5th Annual AVIP VI Conference | October 11-14, 2026 | Orlando, FL

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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.