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This action addresses the agency's residual risk and technology review (RTR) of the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Plywood and Composite Wood Products (PCWP). The PCWP NESHAP, subpart DDDD, was promulgated pursuant to section 112(d) of the Clean Air Act (CAA) on July 30, 2004, and was amended on February 16, 2006, and October 29, 2007. The NESHAP established emission limitations and work practice requirements based on maximum achievable control technology (MACT) for controlling emissions of hazardous air pollutants (HAP) emitted from PCWP facilities. PCWP facilities include lumber, plywood, particleboard, medium density fiberboard, hardboard, (structural) fiberboard, oriented strand board (OSB) and engineered wood products manufacturing processes. The HAP emitted include formaldehyde, methanol, acetaldehyde, acrolein, phenol and propionaldehyde. This action implements the residual risk review requirements of CAA section 112(f)(2) and the technology review requirements of CAA section 112(d)(6). The statute directs the EPA to promulgate emission standards under CAA section 112(f)(2) if such standards are required to provide an ample margin of safety to protect public health or to prevent, taking relevant factors into account, an adverse environmental effect. Any such standards are to be promulgated within 8 years after promulgation of MACT standards under CAA section 112(d). CAA section 112(d)(6) requires the EPA to review and revise the MACT standards as necessary, taking into account developments in practices, processes and control technologies, no less often than every 8 years. Pursuant to a court order (Blue Ridge Environmental Defense League, et al., v. Scott Pruitt (D.D.C))related to the review of 13 source categories, the EPA must complete this action by June 30, 2020.