The EPA is taking direct final action to revise the 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 direct final action adds trans 1-chloro-3,3,3-trifluoroprop-1-ene (also known as Solstice<SUP>TM</SUP> 1233zd(E)) to the list of compounds excluded from the definition of VOCs on the basis that this compound makes a negligible contribution to tropospheric ozone formation.