| http://www.w3.org/ns/prov#value | - Toxic substance Any chemical substance or biological agent, such as bacteria, virus, and fungus, which is any of the following: ??? Listed in the latest edition of the National Institute for Occupational Safety and Health (NIOSH) Registry of Toxic Effects of Chemical Substances (RTECS) ??? Shows positive evidence of an acute or chronic health hazard in testing conducted by, or known to, the employ
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