Additionally , Parties are encouraged to report emissions on substances in annexes I and II , if available , as well as on : pentabromodiphenyl ether ( PeBDE ) , perfluorooctane sulfonate ( PFOS ) , hexachlorobutadeine ( HCBD ) , octabromodiphenyl ether ( OctaBDE ) , polychlorinated naphthalenes ( PCN ) , pentachlorobenzene ( PeCB ) and short-chained chlorinated paraffins ( SCCP ) . Note 1 : It is recommended that the emissions of different congeners of PCDD/F are given in International Toxicity Equivalents ( I-TEQ ) in comparison to 2,3,7,8 , -TCDD using the system by NATO .