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… practical problems in enforcement. A substance such as mercury or cadmium usually is discharged in the environment … presence is forbidden in certain products, for instance, mercury in pesticides. 35 Chapter 4 COMMON LEGAL MECHANISMS … normal periods. A quality standard may set the level of mercury permissible in rivers, the level of sulfur dioxide in …

… The South African plant manufactured and reprocessed mercury compounds. This action was taken by three employees … who were exposed to hazardous and unsafe quantities of mercury. However, by the date of this application the first …

… ‘salts’ (nitrates and sulphates) and heavy metals (mercury and arsenic). Heavy metals such as arsenic can cause …