As used in ORS 433.502 to 433.526, 455.445 and 468A.775 to 468A.785:
(1) “Office workplace” means any enclosed nonmanufacturing indoor area, located in a building of more than 4,000 square feet, and in which 50 or more employees, as defined in ORS 654.005 spend any part of their working hours.
(2) “Public area” means any enclosed indoor area open to and frequented by the public and where, during a representative 24-hour period the number of public occupants exceeds the number of employees, except private residences. “Public area” includes a health care facility as defined in ORS 442.015.
(3) “Remodeling” means any change, addition or modification in the ventilation system for which a building permit is or was required.
(4) “Significant indoor air pollutant” means any solid, liquid, semisolid, dissolved solid, biological organism, aerosol or gaseous material, including combinations or mixtures of substances, which has an adverse effect on human health and has been designated by the state for regulation under ORS 433.502 to 433.526, 455.445 and 468A.775 to 468A.785.