The Treatment of Data Influenced by Exceptional Events (Exceptional Event Rule): Revised Exceptional Event Data Flagging Submittal and Documentation Schedule for Monitoring Data Used in Designations for the 2008 Ozone NAAQS

EPA is finalizing amendments to the Exceptional Events Rule to provide a revised exceptional event data flagging and documentation schedule for ozone data that may be used for designations under the 2008 ozone National Ambient Air Quality Standards (NAAQS). The Exceptional Events Rule states that when EPA sets a NAAQS for a new pollutant or revises the NAAQS for an existing pollutant, EPA may revise or set a new schedule for flagging data for those NAAQS. EPA recently revised the primary and secondary ozone NAAQS to protect public health and welfare; the revised standards became effective May 27, 2008. Consistent with the process envisioned in the Exceptional Events Rule, this final rule revises the dates for flagging data and submitting documentation regarding exceptional events under the revised ozone NAAQS. This revised schedule allows EPA to fully consider State requests for exceptional event concurrence prior to EPA making final designations.