Approval of Implementation Plans; State of Iowa; Elements of Infrastructure SIP Requirements for the 2010 Sulfur Dioxide National Ambient Air Quality Standard (NAAQS)

The Environmental Protection Agency (EPA) is proposing to approve elements of a State Implementation Plan (SIP) submission from the State of Iowa for the 2010 Sulfur Dioxide (SO2) National Ambient Air Quality Standard (NAAQS). Infrastructure SIPs address the applicable requirements of Clean Air Act (CAA) section 110, which requires that each state adopt and submit a SIP for the implementation, maintenance, and enforcement of each new or revised NAAQS promulgated by the EPA. These SIPs are commonly referred to as ``infrastructure'' SIPs. 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. In the ``Rules and Regulations'' section of this issue of the Federal Register, we are approving the state's SIP revisions as a direct final rule without a prior proposed rule. If we receive no adverse comment, we will not take further action on this proposed rule.