Definitions
Diverse definitions of the term VOC are in use.
The definitions of VOCs used for control of precursors of photochemical smog used by EPA, and U.S. States with their own outdoor air pollution regulations include exemptions for VOCs that are determined to be non-reactive, or of low-reactivity in the smog formation process. EPA formerly defined these compounds as Reactive Organic Gases (ROG) but changed the terminology to VOC.
In the USA, different regulation exists per state - most prominent is the VOC regulation by SCAQMD and by California ARB. However, this specific use of the term VOCs can be misleading, specifically when applied to indoor air quality because many chemicals that are not regulated for controlling outdoor air pollution can still be important for indoor air pollution - there is no correlation between VOC content in a product and VOC emissions from that product into indoor air.
Read more about this topic: Volatile Organic Compound
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