How much can a building affect human health—and what happens when occupants become highly sensitive to their environment? In this episode, Steve and Pete are joined by retired building scientist and pulmonary physician Nathan Yost for a thoughtful discussion on Multiple Chemical Sensitivity (MCS) and its relationship to building performance.

Nathan shares insights from decades of experience working with clients dealing with chemical sensitivities, along with more recent medical understanding surrounding pregnancy, hormonal changes, and biochemical sensitivities. The conversation explores where building science intersects with health concerns, how indoor environments can influence occupant comfort, and what building professionals should consider when designing for sensitive individuals.

Steve also shares examples from recent projects where MCS concerns led to major changes in materials, specifications, and interior design decisions. The discussion even ventures into the controversial topic of electromagnetic fields and so-called “dead zones,” highlighting the challenges of balancing occupant concerns with evidence-based building practice.

It’s a fascinating conversation about the overlap between buildings, health, and the limits of what construction professionals can realistically control.

Pete’s Resources:
Helping People with Multiple Chemical Sensitivity
Medical Conditions Building Professionals Need to Know About
Prescriptions for a Healthy House (4th Edition)
NIH – Electric & Magnetic Fields
BuildingGreen – Building Design and EMF