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- The main pressures leading to failure of good chemical status are atmospheric deposition and discharges from urban waste water treatment plants. Atmospheric deposition leads to contamination with mercury in most of the water bodies failing good chemical status. Inputs from urban waste water treatment plants are less significant but lead to contamination with PAHs, mercury, cadmium, lead and nickel.
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"Inputs from urban waste water treatment plants are less significant but lead to contamination with PAHs, mercury, cadmium, lead and nickel."
Please report the level of significance here, this can help decision makers develop policies and identify priorities in water management.
CZ: PAH contamination can be referred to atmospheric depostion as well and in many cases atmospheric deposition would be main source, see the Text box on page 34.