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What is the definition of VOC? – US EPA Feb 25, 2021 · Some VOCs react slowly or form less ozone; therefore, changes in their emissions have limited effects on local or regional ozone pollution episodes. The EPA lists compounds that it has determined to be negligibly reactive in its regulations as being excluded from the regulatory definition of VOCs (40 CFR 51.100(s)), i.e. , these are considered sample storage crimp neck vial-Lab Chromatography Supplier 20-60ml Sample Storage Vials...