In addition, the measured quantity and composition of VOCs in the air can vary significantly depending on the measurement methods used, which has generated additional confusion. This has created a misunderstanding in the marketplace and in the environmental community. While VOCs can also be a health concern outdoors, EPA regulates VOCs outdoors mainly because of their ability to create photochemical smog under certain conditions.Īlthough the same term “VOC” is used for both indoor and outdoor air quality, the term is defined differently to reflect its predominant concern in each context. The main concern indoors is the potential for VOCs to adversely impact the health of people that are exposed. However, the emphasis of that concern outdoors is different from indoors. VOCs are of concern as both indoor air pollutants and as outdoor air pollutants. Indoors, VOCs are mostly released into the air from the use of products and materials containing VOCs.Outdoors, VOCs are volatized or released into the air mostly during manufacture or use of everyday products and materials.Organic chemical compounds 1 are everywhere in both indoor and outdoor environments because they have become essential ingredients in many products and materials. EPA Regulatory Definition of VOCs that Impact Photochemical Oxidation in Outdoor Air.
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