The Environmental Protection Agency (EPA) is taking final action to approve elements of state implementation plan (SIP) submissions from Ohio regarding the infrastructure requirements of section 110 of the Clean Air Act (CAA) for the 2008 lead (Pb) and 2010 nitrogen dioxide (NO<INF>2</INF>) National Ambient Air Quality Standards (NAAQS). The infrastructure requirements are designed to ensure that the structural components of each state's air quality management program are adequate to meet the state's responsibilities under the CAA. The proposed rulemaking associated with this final action was published on July 25, 2014, and EPA received no comments pertaining to infrastructure for the 2008 Pb or 2010 NO<INF>2</INF> NAAQS during the comment period, which ended on August 25, 2014. The 2008 ozone and 2010 SO<INF>2</INF> infrastructure SIPs were also addressed in the proposed rulemaking but will be addressed in a separate final rulemaking.