In September I blogged about OSHA’s Airborne Contaminant Standard, which sets ambient air limits for over 400 workplace air contaminants to protect employees from exposures to airborne chemical and particulate contaminants in workplace air. In October, OSHA issued an extensive Request for Information (RFI), asking for comments on a variety of approaches to setting these limits in the future. In the RFI, OSHA notes that most exposure limits date from 1971, and so they don’t reflect four decades of advances in understanding of chemical toxicology. OSHA is attempting to build on legal requirements for standard-setting developed by court cases since 1971, and to update—the agency doesn’t say finesse—some of the limitations. The RFI asks over 50 questions, and solicits comments no later than April 8, 2015.