Figure 4. Japanese River Water Cadmium Concentration and NiCd Battery Production realized, it is Japan. Yet the data presented in Figure 4 for Japanese river water cadmium concentration and in Figure 5 for Japanese ambient air cadmium concentration respectively exhibit decreasing trends over these years in spite of eightfold increases in NiCd battery production.

A more proper way of expressing average emissions associated with the manufacture of battery systems is to establish those emissions on the basis of the levels per KW-hr of battery energy provided, as the provision of stored energy is the function of a battery and batteries differ markedly in their ability to store energy. Such an analysis has been carried out (Geomet Technologies 1993) for industrial nickel-cadmium batteries intended for electric vehicle applications. These manufacturing emissions data are presented in Table IV.

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