Review of the NAAQS (National Ambient Air Quality Standards) for Carbon Monoxide: Reassessment of Scientific and Technical Information

摘要

This paper evaluates and interprets the available scientific and technical information that EPA staff believes is most relevant to the review of the primary (health) national ambient air quality standards for carbon monoxide and presents staff recommendations on alternative approaches to revising the standards. The assessment is intended to bridge the gap between the scientific review in the EPA criteria document and criteria document addendum for carbon monoxide and the judgments required of the Administrator in setting ambient air quality standards for carbon monoxide. The major recommendations of the staff paper include the following: 1) that the 8 hour primary standard level be set in the range 9 to 12 parts per million; 2) that the 1-hour primary standard level be set in the range 25 to 35 parts per million to provide a comparable level of protection.