Halogen compounds as pollutants

Name(s): 
Overdependence on halons
Nature 
Fluorine, chlorine, bromine, iodine and astatine make up the family of elements know as the halogens. The gases, fluorine and chlorine and the vapours of bromine and iodine are irritants of the respiratory system. They can damage lung tissue resulting in pulmonary oedema which can prove fatal.
Value(s) 
Type 
(E) Emanations of other problems