On February 7, the Occupational Safety and Health Administration (OSHA) issued a reminder to employers to protect employees from workplace carbon monoxide (CO) risks, particularly those associated with wintertime use of portable generators and heating equipment inside enclosed spaces. That reminder includes links to OSHA’s “Carbon Monoxide Fact Sheet,” which outlines hazards and appropriate employer responses. The rest of this note discusses OSHA’s explanation of these risks and how to manage them.