Air Quality: Revision to Definition of Volatile Organic Compounds-Exclusion of trans-1,3,3,3-tetrafluoropropene and 2,3,3,3-tetrafluoropropene

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The EPA is proposing to revise the agency's definition of volatile organic compounds (VOCs) for purposes of preparing state implementation plans (SIPs) to attain the national ambient air quality standards (NAAQS) for ozone under Title I of the Clean Air Act (CAA). This proposed revision would add 2,3,3,3-tetrafluoropropene (also known as HFO-1234yf) and trans-1,3,3,3-tetrafluoropropene (also known as HFO- 1234ze) to the list of compounds excluded from the definition of VOC on the basis that these compounds make a negligible contribution to tropospheric ozone formation.