Heavy ions such as iron, zinc, and arsenic leak during acid mine drainage.

Heavy metals (aluminium, chromium, arsenic, and copper) dissolved in the water as a result of coal burning were deemed to be at acceptable levels, but metals in sediment and mercury in larger pike were found to be excessive.

The reasons for less than satisfactory quality of food were the increased levels of pesticides or heavy metals cadmium, lead and arsenic, while at the same time, the declarations on the original packing of the food were incomplete or non harmonized.

The reason for poor quality has been overly high pesticide and heavy metals quantities cadmium, lead and arsenic, coupled with incomplete and unharmonized declarations on the original packing of food.