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. Author manuscript; available in PMC: 2022 Jul 20.
Published in final edited form as: Environ Sci Technol. 2021 May 25;55(14):9460–9468. doi: 10.1021/acs.est.0c08149

Figure 3.

Figure 3.

PCB profiles of the 3 factors that describe CSS indoor school air. Each congener is presented as the fraction of the total amount of all congeners in the factor. Factor 1 is most similar to a mixture of 61% Aroclor 1254 G4 and 39% Aroclor 1254 KC with a residual that resembles Aroclor 1016. Factor 2 is most similar to a mixture of 52% Aroclor 1254 KC and 48% Aroclor 1254 G4 with a residual that resembles Aroclor 1260. Factor 3 includes a stronger signal from PCB 11 and highly chlorinated congeners.