Haw. Code R. § 11-504-31
As used in this subchapter:
"Engineering" means any service or creative work, the adequate performance of which requires engineering education, training, State licensing, and experience in the application of special knowledge of the mathematical, physical, and engineering sciences. This includes consultation, investigation, evaluation, planning, and design of engineering works and systems, planning the use of land and water, and accomplishing engineering surveys. Such services or work may be either for public or private purposes, and may be performed in connection with any utilities, structures, buildings, machines, equipment, processes, work systems, projects, and equipment systems of a mechanical, electrical, hydraulic, pneumatic, or thermal nature, insofar as they involve safeguarding life, health, or property.
"Industrial hygiene" means the recognition of environmental factors and stresses associated with work and work operations and the understanding of their effects on people and their well-being in the workplace and the community; the evaluation, through training and experience, and with the aid of quantitative measurement techniques, of the magnitude of these factors and stresses in terms of ability to impair a person's health and well-being; and the prescription of methods to control or reduce such factors and stresses when necessary to alleviate their effects.
Haw. Code R. § 11-504-31