This report presents procedures and exposure criteria for selecting SO2 monitoring sites. Data uses are first reviewed and summarized; from this summary a list of specific siting objectives is developed. Site selection procedures were then prepared for specific site types each of which was associated with either a grouping of siting objectives or with an individual objective. Detailed procedures are provided for selecting sites to measure regional mean concentrations, interregional SO2 transport, representative concentrations for areas of various sizes, peak concentrations in urban areas, and emergency episode levels. Recommendations and the rationale for inlet height and orientation, and for minimizing undue influence from nearby sources are presented. Sources of special information and data relevant to selecting specific sites and guidelines for determining locations of sites for satisfying specific objectives are provided in a series of appendices. A bibliography, conveniently arranged according to specific subject areas, is included.

Prepared by The Center for the Environment and Man, Inc. under Contract No. EPA 68-02-2045. "Apr. 1977." "EPA/450-3-77-013." Includes bibliographical references and appendices.