California CodesHSC CodeDivision 26 - AIR RESOURCESPart 1 - GENERAL PROVISIONS AND DEFINITIONSChapter 2 - Definitions§ 39047.2§ 39047.2Added by Stats. 1999, Ch. 477, Sec. 1. Effective January 1, 2000.“PM2.5” means particulate matter 2.5 microns and smaller in size.Cite this sectionCal. Health & Saf. Code § 39047.2 (2026)Copyhttps://ca.codecond.com/codes/hsc/division-26-air-resources/part-1-general-provisions-and-definitions/chapter-2-definitions/section-39047.2CopyOther sections in Chapter 2 - Definitions§ 39010§ 39010.5§ 39010.6§ 39011§ 39011.5§ 39012§ 39013§ 39014§ 39014.3§ 39014.5…§ 39053.5§ 39053.6§ 39054§ 39055§ 39055.5§ 39056§ 39057§ 39058§ 39059§ 39060← § 39047§ 39047.5 →