The proposed rule involves amendments to Rule Chapter 62-296, F.A.C., to implement the reasonable progress portion of the U.S. Environmental Protection Agency’s (EPA’s) regional haze regulations. Pursuant to these regulations, the department is required to ensure that certain sources of visibility-impairing pollutants in Florida limit their emissions such that reasonable progress is made toward the goal of achieving natural visibility conditions in federal Class I areas. New Rule 62-296.341, F.A.C., is created to set forth procedural requirements by which reasonable progress determinations will be made for affected sources.