PCB Congener List

A complete list of polychlorinated biphenyl (PCB) congeners.

Explanation of "Descriptors"
Congener descriptors give a shorthand notation for geometry and substituent positions. The 12 "Dioxin-like" congeners are those that display all four of descriptors.

CP0 / CP1
These 68 "Co-Planar" congeners include 20 with chlorine substitution at none (CP0, non-ortho) and 48 with chlorine substitution at only one (CP1, mono-ortho) of the 2, 2', 6, or 6' positions.

4CL
These 169 congeners have a total of four or more chlorine substituents (regardless of position).

PP
These 54 congeners have both para positions (4 and 4') chlorinated.

2M
These 140 congeners have two or more of the meta positions (3, 3', 5, and 5') chlorinated.