National Ambient Air Quality Standards for Nitrogen Dioxide: Final Decision

The level for both the existing primary and secondary national ambient air quality standards (NAAQS) for nitrogen dioxide (NO<INF>2) is 0.053 parts per million (ppm) (100 micrograms per meter cubed (<greek-m>g/m\3\)) annual arithmetic average. As required under the provisions of sections 108 and 109 of the Clean Air Act (Act), the EPA has conducted a review of the criteria upon which the existing NAAQS for NO<INF>2 are based. On October 2, 1995, the Administrator announced her proposed decision not to revise either the primary or secondary NAAQS for NO<INF>2 based on this review (60 FR 52874; October 11, 1995). Today's action provides the Administrator's final determination, after careful evaluation of the comments received on the October 1995 proposal, that revisions to neither the primary nor the secondary NAAQS for NO<INF>2 are appropriate at this time.