This report is based on the findings from 70 personal interviews and 228 mail questionnaires obtained from various categories of potential users. The user survey is keyed around four general questions: What are your specialized subject interests. What are your principal present information sources. What are your difficulties in securing needed air pollution information. What services can the Center provide to better meet your needs. Of the services which might be provided or sponsored by the Center, the five receiving the highest desire ratings' are: Abstracts, with increased coverage and indexing. Accession lists of references acquired, as an 'express' current awareness medium and specialized announcement service. Bibliographic search services. Periodic state-of-the-art reviews. Critical monographs, as warranted. The first three are generally desired by all groups. Of the last two, the governmental and industrial groups express the greater preference for reviews, while the research community prefers critical monographs. (Extracted.