Air Quality: Revision to Definition of Volatile Organic CompoundsExclusion of t-Butyl Acetate

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This action proposes to revise EPA's definition of volatile organic compounds (VOC) for purposes of Federal regulations related to attaining the national ambient air quality standards (NAAQS) for ozone under title I of the Clean Air Act (Act). This proposed revision would add t-butyl acetate (also known as tertiary butyl acetate or informally as TBAC or TBAc) to the list of compounds excluded from the definition of VOC on the basis that this compound has negligible contribution to tropospheric ozone formation. As a result, if you are subject to certain Federal regulations limiting emissions of VOCs, your emissions of TBAc may not be regulated for some purposes.