EPA Sets First-Time Inhalation Risk Limits For Widespread Toxin Dioxane

The Environmental Protection Agency has released for public comment and external peer review an updated version of its year-old draft assessment of the common contaminant 1,4-dioxane, including in the document new studies used to derive first-time risk limits for inhaling the chemical. The move comes as OSHA struggles with how to update years-old permissible exposure limits for a long list of chemicals. In addition to its 2004 PELs of 100 ppm for general industry, construction and shipyards, OSHA also regulates 1,4-dioxane under the Hazard Communication Standard and as a chemical hazard in lab