| http://www.w3.org/ns/prov#value | - wo per cent if the toxic or hazardous substance exists as an impurity in the mixture; provided, however, that the commissioner of DPH may, by regulation, raise the concentration requirement for a toxic or hazardous substance which he or she finds is not toxic or hazardous at the threshold levels; and may lower the concentration requirement for a toxic or hazardous substance including carcinogens,
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