Haw. Rev. Stat. § 342D-103: Prohibited air emissions.

(a) No person shall operate an incinerator of a large commercial passenger vessel in any Hawaiian port for the combustion of any waste materials.

(b) Except as provided under section 342D-106, large commercial passenger vessels shall limit visible emissions, excluding condensed water vapor, to no more than twenty per cent opacity for periods of time exceeding six minutes in any sixty-minute period except for the following:

(1) When the ship is maneuvering to or from the dock or anchor;

(2) In the event of a navigational or safety concern on the ship; or

(3) In the event of an equipment failure; provided that the cruise line shall upon request, provide information to the department that describes the subject equipment, malfunction, corrective actions taken, and the start and end times of the malfunctioning period.