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In a recently completed study funded by GREENGUARD Environmental Institute (GEI), there was preliminary evidence that “green” low-emitting products may still cause increased chemicals in indoor environments. The study, conducted by Chi Phuong Hoang, a doctoral candidate at the University of Texas at Austin’s Civil, Architectural and Environmental Engineering program, revealed that even “green” wall, flooring, ceiling and cabinetry materials can cause “secondary” emission of chemicals when exposed to naturally occurring ozone in the indoor air.
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Secondary emissions of VOCs may still harm human health. Other examples of secondary emissions is when porous materials, such as upholstery, carpeting and ceiling tiles, absorb primary emissions from high emitting building products and materials, and re-emit them into the indoor air. This is often referred to as the “VOC sink effect.” To help avoid this problem, it's good practice to apply wet products (paints, adhesives, coatings) before installing porous materials.
“The research confirms the importance of analyzing the impact that building products and materials may have on indoor air,” said Carl Smith, GEI’s CEO. “The interactions of the chemicals produced by products requires additional research into their reactions and impacts on human health and the environment.”
Indirectly, the study reveals limitations of current measures of “green” products. Indoor air is a complex mix of chemicals, allergens and particles that react in ways that could potentially harm human health. While measuring the primary chemical emissions from products begins to address some of these issues, it still does not adequately predict all of the chemicals that might be present in indoor environments.
Chi’s study was funded by the GEI Ken Dillon Memorial Fellowship, named in the memory of W. Ken Dillon, a noted public health researcher who served on GEI’s Advisory Board. The fellowship supports graduate students seeking to better understand the impact of indoor air on the health and well being of building occupants.
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