concentration

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Most bottom ash and combined ash samples under test analyses did not exceed maximum allowable concentrations for metals.
The fact is that the maximum allowable concentrations are not established for coal dust, moreover, laboratories that are accredited to perform measurements of the level of atmospheric air pollution with harmful emissions do not emit coal dust among other suspended substances when they are conducted.
1 percent] tested outside the Maximum Allowable Concentrations (MAC) table limits.

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