The 2021 Symposium in Bethesda, Maryland is over. Thank you to all the attendees, speakers, and exhibitors who made our first in-person event a reason to celebrate! 

On-Demand tickets on sale November 22nd, 2021 through December 31st, 2021

The On-Demand Program may be viewed from December 1, 2021 through February 28, 2022.
Online C.E. is available

The International Radon and Vapor Intrusion Symposium brings trade professionals, scientists, educators, policymakers, advocates, consumers and more together to learn, collaborate and connect. The Symposium attracts hundreds of attendees annually from around the world. 

Come Celebrate with AARST!



For 35 years, AARST’s mission statement, “dedicated to the highest standard of excellence and the ethical performance of radon measurement, mitigation, and transfer of information for the benefit of members, consumers, and the public at large” has been at the heart of every symposium. Annually, dozens of practitioners, educators, and researchers assemble to share their knowledge. This information transfer doubles with the added benefit of Continuing Education credits for radon certifications and licenses. Visit the Education page to learn more about courses and C.E. available at the symposium.

The International Radon Symposium is the highlight of our year! We attend many excellent conferences in Europe. The scale of the AARST Symposium, thanks to the breadth of knowledge and experience shared by attendees, makes it invaluable for us. 

Rebecca Coates

Great technical and real world presentations. I learned a tremendous amount of new information and skillsets. Networking with other attendees and radon businesses was great and valuable in growing my business.

Nate Burden

As a past speaker at the AARST Symposium, I have connected with a number of professionals regarding soil gas issues they encounter. As a technical expert on environmentally challenged properties, I applaud AARST for stepping up to serve as the voice for the vapor intrusion segment of our industry. – David Gillay, Barnes and Thornburg LLP