Figure 2
From: Serum PCB levels and congener profiles among US construction workers
Referent and Worker Percent Contribution 57 PCB Congeners. The contrast in congener composition by percent contribution is apparent as the contribution of lighter congeners (di, tri-, and tetra-chlorinated, PCB 6–74) to the total PCB level is 11.7 % for the construction workers, compared to 6.5% for the referents.