Indoor Environments Association - Formerly AARST

Indoor Environments Association - Formerly AARST AARST, now doing business as Indoor Environments Association. www.NRPP.info for questions regarding certification, exams, CE, and more.

For questions, please visit:
www.indoorenvironments.org for questions regarding membership, chapters & more.

Register during the Early Bird Sale for this year's Indoor Environments Radon and V***r Intrusion Symposium in Norfolk, ...
03/16/2026

Register during the Early Bird Sale for this year's Indoor Environments Radon and V***r Intrusion Symposium in Norfolk, VA!
Early Bird Sale ends June 30th. IEA members save even more!
- Exceptional Technical Content
- Free Continuing ED
- Career Advancement
- Vendor Interaction
- Build Relationships

***rIntrusion ***rIntrusion

IEA is seeking thought leaders, innovators, and industry experts to share their insights at the Indoor Environments 2026...
03/13/2026

IEA is seeking thought leaders, innovators, and industry experts to share their insights at the Indoor Environments 2026 Radon & V***r Intrusion Symposium, taking place October 4–7, 2026, in Norfolk, VA.

This is your opportunity to contribute to one of the industry’s most anticipated events and help shape the future of indoor environmental health. Submit your abstract and be part of an impactful exchange of ideas and best practices.

🔎 Topics of Interest Include:
🛠️ Radon Mitigation & Measurement
📐 V***r Intrusion Mitigation & Measurement
👩⚖️ Radon Policy
🏭 VI Regulation, Guidance & Policy
🌿 State & Tribal Radon Programs
📚 Science & Research Studies
🔬 Technology Development

📌 Submit today and learn more— scan the QR code to go to https://indoorenvironments.org/symposium/

We look forward to seeing you in Norfolk! 🌊

Radon may be invisible, but its impact is very real.It’s a naturally occurring radioactive gas that can enter homes thro...
03/13/2026

Radon may be invisible, but its impact is very real.

It’s a naturally occurring radioactive gas that can enter homes through the soil and build up indoors without anyone noticing. In fact, radon is the second leading cause of lung cancer in the United States.

The good news? Testing is simple.

✔ Every home can have radon
✔ The only way to know is to test
✔ Certified professionals can help guide the next steps

Take a moment this Friday to learn something that could protect your home and your health.

Quick question:
Have you ever tested your home for radon?

ANSI/AARST MAHProtocol for Conducting Measurements of Radon and Radon Decay Products in HomesThe ANSI/AARST MAH standard...
03/11/2026

ANSI/AARST MAH

Protocol for Conducting Measurements of Radon and Radon Decay Products in Homes

The ANSI/AARST MAH standard establishes the minimum requirements for measuring radon in single-family residences to determine whether mitigation is needed to protect current and future occupants.

This Soil Gas Measurement Standard applies to:
• Homeowners
• Real estate and non-real-estate transactions
• Professionals providing radon testing services

What MAH Covers
• Proper planning for radon tests, including multiple test locations
• Minimum test durations and closed-building condition requirements
• How to evaluate and resolve conflicting test results
• Clear professional requirements for qualifications, documentation, and reporting

Sections 1–7 apply to anyone conducting radon tests.
Sections 8–9 apply to professional services.

What’s New in MAH-2023
✔ Improved guidance for multi-location testing
✔ Clear direction when closed-building conditions start late
✔ Better handling of disagreeing test results
✔ Strengthened professional documentation and reporting requirements

📅 Effective date for compliance: December 1, 2023
📄 Prior version: MAH-2019

ANSI/AARST standards are developed and maintained by a balanced, ANSI-accredited consensus body of volunteers representing regulators, scientists, laboratories, professionals, and public health stakeholders — ensuring credibility, transparency, and public trust.

💡 IEA Members Benefit
Members of the Indoor Environments Association (IEA) receive full access to all ANSI/AARST standards — including searchable PDFs and printing privileges, not just flipbook viewing.

Learn more about the standards and membership benefits at
👉 standards.aarst.org









🎙 Now Live: Radon Is a Lifetime ExposureWhat happens when someone tests their home for radon… and realizes they’ve lived...
03/10/2026

🎙 Now Live: Radon Is a Lifetime Exposure

What happens when someone tests their home for radon… and realizes they’ve lived there for 20+ years?

In our latest episode of The Indoor Environments Project, we talk with Dr. Allison Wallace about cumulative radon exposure and lung cancer risk — especially among people who have never smoked.

This episode dives into:

• How lifetime exposure shapes risk
• Why screening criteria may need to evolve
• What doctors need to know about radon
• And why prevention is still our most powerful tool

Radon isn’t just a test result.
It’s a long-term exposure — and a preventable one.

🎧 Listen here: [Insert link]






Better air starts with better professionals.

Protect your home: Radon facts you need to know.Radon levels can change due to weather, home use, or building modificati...
03/06/2026

Protect your home: Radon facts you need to know.

Radon levels can change due to weather, home use, or building modifications. Periodic testing is recommended.

An NRPP-certified professional can help ensure testing is performed correctly over time.

Learn more at indoorenvironments.org.

NRPP certification verifies qualifications for radon measurement providers.Certification confirms that individuals meet ...
03/04/2026

NRPP certification verifies qualifications for radon measurement providers.

Certification confirms that individuals meet established requirements for training, examination, and ongoing competency.

Learn more at nrpp.info.


The Indoor Environments Radon and V***r Intrusion Symposium isn’t just a conference—it’s where the industry shares its l...
03/03/2026

The Indoor Environments Radon and V***r Intrusion Symposium isn’t just a conference—it’s where the industry shares its latest research, field experience, and technical guidance.

🧠 Presentation slides from dozens of Symposium speakers are now available, offering insight into:
• Emerging challenges
• Updated methodologies
• Real-world case studies
• Standards development and implementation

If you want to understand where the industry is headed, this is where the conversation starts.

Browse the 2025 slides:
👉 https://aarst.org/symposium/speakers-slides-2025/

And remember—some of the most valuable discussions happen live.





Protect your home: Radon facts you need to know.Radon is a colorless, odorless gas. You can’t see or smell it — testing ...
02/27/2026

Protect your home: Radon facts you need to know.

Radon is a colorless, odorless gas. You can’t see or smell it — testing is the only way to know if it’s present in your home.

When testing, work with an NRPP-certified professional to ensure proper methods and reliable results.

Learn more at indoorenvironments.org.

🎙 New Episode: Radon Is a Lifetime ExposureRadon risk is not a snapshot in time — it’s a cumulative, lifetime exposure.I...
02/25/2026

🎙 New Episode: Radon Is a Lifetime Exposure

Radon risk is not a snapshot in time — it’s a cumulative, lifetime exposure.

In this episode of The Indoor Environments Project, we sit down with . Allison Wallace, thoracic surgeon and lung cancer researcher, to discuss how long-term radon exposure contributes to lung cancer risk — particularly among never-smokers.

We explore:

• Why lifetime exposure is difficult to quantify
• The limits of current screening models
• The gap between environmental awareness and medical education
• What radon professionals should recommend when clients discover elevated levels after decades in one home

This conversation bridges environmental science, clinical medicine, and public policy — and reinforces something we know in this industry:

Radon is measurable.
Radon is preventable.
And professional standards matter.

🎧 Listen now: https://aarst.org/podcast/







Better air starts with better professionals.

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Radon Professionals Saving Lives

The American Association of Radon Scientists and Technologists (AARST) is a nonprofit, professional organization whose members are dedicated to the highest standard of excellence and ethical performance of radon measurement, radon mitigation and transfer of radon information for the benefit of members, consumers and the public at large. Learn More - visit our website www.AARST-NRPP.com