ISO  20304-1” Fine bubble technology — Water treatment applications — Part 1: Test method for evaluating ozone fine bubble water generating systems by the decolorization of methylene blue” of International Standard was published.

ISO 24261-1 "Elimination method for sample characterization — Part 1: Evaluation procedure" of International Standard was published.

ISO／TR 23015 "Measurement technique matrix for the characterization of fine bubbles" of Technical Reports was published.