Figure 1 - National Trend in Annual Average Benzene Concentration in Metropolitan Areas: 1993-1998
Figure 1 - National Trend in Annual Average Benzene Concentration in Metropolitan Areas: 1993-1998SOURCE: U.S. Environmental Protection Agency, Office of Air QualityPlanning and Standards, National Air Quality and Emissions Trends Report, 1998, available at http://www.epa.gov/oar/...