“Reduced-oxygen packaging” means the reduction of the amount of oxygen in a package by mechanically evacuating the oxygen, displacing the oxygen with another gas or combination of gases, or otherwise controlling the oxygen content in a package to a level below that normally found in the surrounding atmosphere, which is 21 percent oxygen.
“Reduced-oxygen packaging” includes methods that may be referred to as altered atmosphere, modified atmosphere, controlled atmosphere, low oxygen, and vacuum
packaging, including sous vide.
Source:
Section 113883, https://leginfo.legislature.ca.gov/faces/codes_displaySection.xhtml?lawCode=HSC§ionNum=113883..