DIY Box Fan Filter – MERV 13 versus HEPA Air Purifier

Air flow of fan filter on intake side. Wildfire smoke and air quality
DIY Box Fan Filter & Air Quality Experiment Here in San Francisco and surrounding areas kids are stuck indoors during this smoke wave caused by our wild fires with little or no air filtration. In San Francisco the school buildings are older and are not setup to have building wide air filtration. Nor can cash-strapped
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Wildfire Smoke and Indoor Air Quality

Wildfire Smoke
Bay Area Wildfire Smoke and Indoor Air Quality I am writing this on November 13, 2018.  For the past week the state of California has been cloaked in thick, noxious smoke from the wildfires burning out of control.  Northern California is mostly affected by the Camp Fire near Chico, CA and Southern California by the
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Cleaning Up a Cannabis Grow Operation

How to Clean Up a Weed Grow Operation
With the legalization of marijuana, some black-market growers are abandoning their illegal cannabis grow operations. Grow ops, often set up in rented properties, can leave a mess for landlords to clean up. Many of these properties are put up for sale and then become the responsibility of the home buyer. Identifying a grow op is 
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Interesting Things About EMF Testing

5 Interesting Things About EMF (Electromagnetic Fields): There are 5 different types of “EMF” that are commonly tested in buildings: low frequency magnetic fields low frequency electric fields “dirty electricity”, “high-voltage transients” or “electrical noise” radio frequency (RF) radiation alpha, beta and gamma ionizing radiation Each of the above types of radiation originates from unique
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Who is Healthy Building Science?

We are an environmental consulting firm based in the San Francisco Bay Area, a group of scientists working to make your indoor spaces healthier. We test your building or property to find harmful pollutants.
Healthy Building Science

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