OSHA is making changes to its hazard communication standard which requires employers to notify employees of the presence of hazardous chemicals in the workplace. Petroleum marketers have been required to comply with the OSHA hazard communication standard since it was first introduced in 1983. The changes are being made to align OSHA’s requirements to international standards for chemical container labeling and material safety data sheets (MSDS). Employers must train applicable employees on the label and MSDS changes by December 1, 2013.