https://www.usajobs.gov/Help/working-in-government/unique-hiring-paths/students/federal-occupations-by-college-major/; or A combination of experience and graduate education as described above that equates to one year of experience GS-9: Successful completion of a master's or equivalent graduate degree in safety or occupational health fields (safety, occupational health, industrial hygiene) or a degree in other related fields that included or was supplemented by at least 24 semester hours of study form among the following (or closely related) disciplines: safety, occupational health, industrial hygiene, occupational medicine, toxicology, public health, mathematics, physics, chemistry, biological sciences, engineering, and industrial psychology; or Successful completion of two full years of progressively higher level graduate education leading to a master's degree in safety or occupational health fields (safety, occupational health, industrial hygiene) or a degree in other related fields that included or was supplemented by at least 24 semester hours of study form among the following (or closely related) disciplines: safety, occupational health, industrial hygiene, occupational medicine, toxicology, public health, mathematics, physics, chemistry, biological sciences, engineering, and industrial psychology; or Successful completion of an LL.B. D. or equivalent doctoral degree in safety or occupational health fields (safety, occupational health, industrial hygiene) or a degree in other related fields that included or was supplemented by at least 24 semester hours of study form among the following (or closely related) disciplines: safety, occupational health, industrial hygiene, occupational medicine, toxicology, public health, mathematics, physics, chemistry, biological sciences, engineering, and industrial psychology; or Successful completion of three full years of progressively higher level graduate education leading to a Ph.