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Maximum observed airborne concentrations of benzene (B), toluene (T), ethylbenzene (E), meta- and para-xylene (m,p-X), and ortho-xylene (o-X). Observed levels of all five volatile organic compounds were well below 30 μg/m3 (indicated by an arrow on each graph that points off the chart range), which is the standard for benzene, the most stringent Reference Concentration (RfC), as set by the Environmental Protection Agency (EPA), of the five volatile organic compounds (VOCs).
