The administrative procedure act, chapter 34.05 RCW, shall apply to the appeal of rules and regulations adopted by the board to the same extent as it applied to the review of rules and regulations adopted by the directors and/or boards or commissions of the various departments whose powers, duties and functions were transferred by section 6, chapter 62, Laws of 1970 ex. sess. to the department. All other decisions and orders of the director and all decisions of air pollution control boards or authorities established pursuant to chapter 70A.15 RCW shall be subject to review by the hearings board as provided in this chapter.