Why is EPA issuing this guidance on 8-hour ozone NAAQS nonattainment designations?
States have requested that EPA provide guidance on the appropriate boundaries for areas that will be designated nonattainment for the 8-hour standard. The EPA provided initial guidance on designations in a June 1999 memorandum. (3) That memorandum noted that EPA would provide additional information on designations at a future date. This guidance on how to determine the appropriate boundaries for areas that will be designated nonattainment for the current 8-hour ozone NAAQS is intended to meet that commitment. In addition, in light of the court decision remanding the 8-hour standard to EPA, States have asked what the implications are if EPA issues a revised ozone standard in response to the court’s remand. On July 18, 1997, EPA issued the revised NAAQS for ozone (62 FR 38856). The new standard is 0.08 parts per million (ppm) averaged over 8-hours; this compares to the pre-existing NAAQS of 0.12 ppm averaged over 1 hour. This action triggered the requirement under 107 of the Act and 6103
Related Questions
- What is EPA’s guidance when there is a change in household status during a remodeling activity (i.e. if a child moves in after work has started or if a woman in the house gets pregnant)?
- Are there differences between the calculations for determining NAAQS attainment and for determining the EPHT air quality measures for ozone?
- Does EPA have guidance on the PFPR rule available for zero discharge facilities? Are zero dischargers covered by the rule?
