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This final rule will address the agency's residual risk and technology review (RTR) of the National Emission Standards for Hazardous Air Pollutants (NESHAP) for Surface Coating of Wood Building Products. The Surface Coating of Wood Building Products NESHAP, subpart QQQQ, was promulgated pursuant to section 112(d) of the Clean Air Act (CAA) on May 28, 2003. The NESHAP established emission limitations and work practice requirements based on maximum achievable control technology (MACT) for controlling emissions of hazardous air pollutants (HAP) from major sources that apply a surface coating to a wood building product. The HAP emitted from major sources that apply a surface coating to a wood building product include xylenes, toluene, ethyl benzene, glycol ethers, methyl isobutyl ketone (MIBK), methanol, styrene and formaldehyde. This action will implement the residual risk review requirements of CAA section 112(f)(2) and the technology review requirements of CAA section 112(d)(6). CAA 112(f)(2) ) directs EPA to revise the NESHAP if such revisions 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. 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. At proposal, we proposed to find the residual risk remaining after the implementation of MACT acceptable under CAA 112(f)(2) with an ample margin of safety to protect public health and to prevent any adverse environmental effect. At proposal, we also proposed that there were no category changes in pollution control practices, processes or controls leading to a revision of the standard under CAA 112(d)(6). Pursuant to a court order related to the review of 13 source categories, the EPA must complete 7 final RTR actions by December 31, 2018, and 6 additional RTR actions by June 30, 2020. The EPA currently plans to complete this action by December 31, 2018.