The purpose of the proposed rule development (OGC No. 10-1826) is to update Chapter 62-204, F.A.C., to remove or revise obsolete provisions related to ambient air quality standards and area designations. This rulemaking is needed for implementation of new National Ambient Air Quality Standards and in preparation for expected new federally designated nonattainment areas. The proposed changes will remove excess or redundant language, delete or revise several definitions, simplify area designation rule sections to align with Federal rule language, and clarify various provisions.