Recent studies have focused attention on the fact that residents of inner-city neighborhoods are subject to greater amounts of pollutants than are other neighborhoods of large cities. In this study, the premise is set forth and investigated at the metropolitan scale, seeking to discover differences of impact between the center city and its suburbs. The report hypthesizes differentials of a generalized metropolitan area, by pollutant types and by interpreting diverse information sources. The findings were considered in the light of standards imposed by federal and state regulation, first uniformly enforced, then implications for variable enforcement. (Author/BB)