FQPA of 1996, directed EPA to move beyond single chemical assessments and to conduct cumulative assessments of chemical exposures occurring simultaneously. As of 2020, EPA has assessment and updated cumulative risk assessments for five groups of pesticides share a common mechanism of toxicity: organophosphates, n-methyl carbamates, Triazines, chloroacetanilides, Pyrethrins/Pyrethroids. EPA has examined and determines thiocarbamates and dithiocarbamates do not share a common mechanism of toxicity.
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