NIOSH is a research institute; it can recommend that employers reduce worker exposure — and ways they might do that — but it has no enforcement power. (scientificamerican.com)
Minimizing Worker Exposure in Highway Work Zones Through the Use of Positive Protection and Other Strategies (atssa.com)
It's use as a hardening agent in epoxy resins and adhesives creates concerns about worker exposure. (treehugger.com)