All safety and environmental health and safety professionals, including (by job title) industrial hygienists, safety directors and officers, transportation safety specialists, environmental supervisors, specialists, and engineers, safety engineers, toxicologists, union representatives, health and safety technicians, risk managers (insurance), compliance officers in corporations and government, plant or facilities managers, production supervisors, human resource specialists, workers' compensation specialists, attorneys, chemical manufacturers and distributors (including writers and editors of material safety data sheets), waste disposal specialists, health care professionals including industrial nurses and physicians, and first-response personnel including paramedics and firefighters.