The definitions of VOCs useful for Charge of precursors of photochemical smog used by the U.S. Environmental Safety Agency (EPA) and condition businesses during the US with independent outdoor air pollution laws incorporate exemptions for VOCs which have been determined to become non-reactive, or of lower-reactivity in the smog formation https://informationtechnology28494.tkzblog.com/13422812/what-does-voc-test-mean