hazardous air pollutants introduction this section includes singled out for control under recent international protocols of the un ece convention on long range transboundary pollution namely persistent organic pops and heavy metals hms was signed in 1979 entered into force 1983 since its entry has been extended by a number including 1998 protocol these two are given outline below more information may be found at web site located http www unece org env lrtap uk both focuses list 16 substances or groups that have identified according to certain risk criteria brief classified three source sectors as follows pesticides aldrin chlordane chlordecone ddt dieldrin endrin heptachlor hexachlorobenzene hcb mirex toxaphene hexachlorocyclohexane hch incl lindane industrial chemicals hexabromobiphenyl polychlorinated biphenyls pcbs products contaminants dioxins furans polycyclic
