Air Quality: Revision to Definition of Volatile Organic CompoundsExclusion of Volatile Methyl Siloxanes and Parachlorobenzotrifluoride

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This action revises EPA's definition of volatile organic compounds (VOC) for purposes of preparing State implementation plans (SIP's) to attain the national ambient air quality standards (NAAQS) for ozone under title I of the Clean Air Act (Act) and for the Federal implementation plan (FIP) for the Chicago ozone nonattainment area. This revision adds parachlorobenzotrifluoride (PCBTF) and volatile methyl siloxanes (VMS) to the list of compounds excluded from the definition of VOC on the basis that these compounds have negligible contribution to tropospheric ozone formation.