This page contains a fact sheet, a resource document and supporting technical information for states developing maintenance plans for the 1997 ozone national ambient air quality standards (NAAQS).

• Fact Sheet (pdf) (130.74 KB, November 20, 2018)
  The EPA is providing a resource document and supporting technical information to assist states in developing maintenance plans for areas that have second maintenance plan obligations in accordance with the recent South Coast II decision, or that are seeking initial redesignation to attainment for that standard. The resource document also discusses the option of developing a “limited maintenance plan” (LMP) for certain areas.
• Resource Document for 1997 Ozone NAAQS Areas: Supporting Information for States Developing Maintenance Plans (pdf) (194.63 KB, November 20, 2018)
  The purpose of this resource document is to provide technical information that may be helpful for a state wishing to develop and submit a revision of its state implementation plan (SIP) to ensure maintenance of the 1997 ozone National Ambient Air Quality Standards (NAAQS). This document includes information addressing ambient air quality monitoring data, air quality modeling, and emissions inventory data.