The definitions of VOCs useful for control of precursors of photochemical smog used by the U.S. Environmental Safety Agency (EPA) and condition organizations inside the US with impartial outside air pollution regulations incorporate exemptions for VOCs which can be identified to become non-reactive, or of small-reactivity inside the smog formation https://voctest40515.pointblog.net/5-Essential-Elements-For-VOC-TEST-54734047