In one of the most significant rulemaking efforts in over a decade, OSHA has finalized a rule revising its hazard communication standard to align it with the United Nations’ Globally Harmonized System of Classification and Labeling of Chemicals (GHS). The rule will affect over 5 million business establishments across the country. Over 40 million employees will need to be retrained on hazard communication under the proposal. OSHA estimates the annualized compliance costs will be over $200 million for employers. Annualized net monetized benefits are estimated to be approximately $550 million.