Smog and Particulates

Tuesday, 01 October 2013 by
Particles_Blue Oxygen

Smog and Particulates How Fine Particulates Affect Exterior and Interior Air Quality No matter how well our “Green and Healthy” homes are designed and built, our interior air quality can only be as good as our exterior air quality (our “source air”), unless we add active air filtration into our building design.  But how do






Dirty Electricity from LEDs

EMI and LEDs –  Not all LEDs are the same! Electromagnetic Interference (EMI, aka: “Dirty Electricity,” or “High Voltage Transients”) is a term coined for quick transient pulses, harmonics, spikes and dips in the electrical power in a home’s wiring that deviates from a purely 60Hz sine wave.  These often occur due to computers, other






Blown-in-Cellulose Insulation

Wednesday, 21 August 2013 by
blown-in-cellulose insulation

Blown-in-Cellulose Insulation Test Results On a recent project, we recommended a homeowner try Blown-in-Cellulose insulation as a healthy alternative to other insulation choices. Blown-in-cellulose is known in the healthy materials world as a pretty safe insulation choice. But just to be sure the product was safe, we sent a wet sample to a lab for






CO2 in the air

CO2 in the Air – Why is My Air Stale and Stuffy? Carbon Dioxide and Its Relation to Your Interior Air Quality. CO2 in the Air. Why is my air “Stale?” Many of my clients often complain of either specific symptoms, general malaise, or “just not feeling right” when in a building they spend a






How to Measure EMF

Thursday, 30 May 2013 by
ElectroMagnetic EMF Spectrum

How to Measure EMF: The Art of Knowing What You Are Studying There are a lot of people out there concerned about electromagnetic fields (EMF) and electromagnetic radiation (EMR or also known as radio frequency (RF)).  People want to know how to measure EMF. So much so, that they purchase detectors and meters for themselves and






Asthma and Buildings

Friday, 10 May 2013 by
Asthma and Buildings

Asthma and Buildings – California and US Trends in Asthma Buildings are too often neglected in the asthma equation. Asthma is sometimes defined as a symptom of poor indoor air quality, and other times defined as a Building Related Illness. This blog references the recently released report, “Asthma in California: A Surveillance Report,” compiled by






HVAC and filtration best practices

HVAC and Filtration Best Practices for Healthy Home This blog expands on an earlier post about the 25 Principles of Building Biology and the Healthy Home Standard Checklist. Here we’ll dive deeper into the Indoor Air Quality Checklist, and focus on best practices for Heating, Cooling and Ventilating a healthy building. “HVAC and Filtration Best Practices for Healthy






Antioch College Internship

Tuesday, 05 March 2013 by
Antioch College Internship

Healthy Building Science has officially employed two Antioch College students. I did my first “co-op” in 1996 in a peace camp deep in the heart of Chiapas during the Zapatista uprising. Funny how the circle comes all the way around. Dustin Mapel is an Antioch student currently interning with Healthy Building Science. Antioch has long






Building Biology 25 Principles

Tuesday, 05 February 2013 by
Building Biology 25 Principles

No one rating system can isolate every possible environmental angle, and the International Institute of Building Biology founders were certainly most interested in human health, but it is hard to imagine a more comprehensive healthy building checklist than what’s provided in the Building Biology 25 Principles. It is quite difficult to incorporate every principle into






Building Biologist in the US

Helmut Ziehe is the Building Biologist who brought Building Biology to the United States. Helmut learned Bau-Biologie in Germany from the “mothership.” In Germany he was trained as an environmentally-conscious architect at the Technical University of Berlin, followed by a Master’s Degree from the London School of Architecture. Helmut mastered 5 languages during his life






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