Here are a couple of programs:
Occupational Safety and Health, Ph.D. < West Virginia University (wvu.edu)
industrial management and technology
Also consider earning some certifications:
Certified Safety Professional (CSP), Associate Safety Professional (ASP), Graduate Safety Professional (GSP), Occupational Hygiene & Safety Technician (OHST), Construction Health & Safety Technician (CHST) or Certified Industrial Hygienist (CIH)