Ozone

CAS 10028-15-6

Ozone is an antimicrobial used to treat water, to sanitise surfaces and to wash produce. It kills organisms and then decomposes to ordinary oxygen, leaving no residue — which is its advantage over chlorine.

Where it is and isn’t permitted

Status of Ozone by jurisdiction. Every jurisdiction this site covers is listed, including those where the substance does not appear.
JurisdictionStatusScope and limitsCitation
United StatesFood and Drug AdministrationPermitted, with conditions21 CFR 173.368and 1 further provisionretrieved 2026-09-07
Codex AlimentariusCodex Alimentarius Commission / JECFANot listedDoes not appear on this jurisdiction’s permitted list. That is not the same as being prohibited.

What it is made from

Generated on site from oxygen by electrical discharge or ultraviolet light. It is too unstable to store or ship, so it is always made where it is used.

  • Vegan
  • Vegetarian
CAS registry number
10028-15-6
InChIKey
CBENFWSGALASAD-UHFFFAOYSA-N
PubChem
CID 24823

Every name it appears under

21 recorded names. A label may use any of them.

CAS registry number

  • 10028-15-6

As it appears in regulation

  • Ozone

Other names

  • 66H7ZZK23N
  • CCRIS 4503
  • Ground Level Ozone
  • HSDB 717
  • Level Ozone, Ground
  • Level Ozone, Low
  • Low Level Ozone
  • Oxygen, mol (O3)
  • Ozon
  • OZONE
  • Ozone heavy work
  • Ozone, Ground Level
  • Ozone, Low Level
  • Ozone, Tropospheric
  • ozono
  • Triatomic oxygen
  • trioxygen
  • trioxygene
  • Trisauerstoff

Hazard reference values

No reference value for this substance in the sources we hold.

Evidence and how bodies read it

Studies, and the differing conclusions regulators drew from them, are curated by hand rather than machine-read, and none has been written for this substance yet.

Sources for this page

  • ecfr retrieved 2026-09-07

Full licence terms and publisher details on Sources. How this page is built and updated: Method.

Machine-readable:/api/v1/additives/ozone.json