Registration Dossier

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Please be aware that this old REACH registration data factsheet is no longer maintained; it remains frozen as of 19th May 2023.

The new ECHA CHEM database has been released by ECHA, and it now contains all REACH registration data. There are more details on the transition of ECHA's published data to ECHA CHEM here.

Diss Factsheets

Physical & Chemical properties

Appearance / physical state / colour

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Administrative data

Link to relevant study record(s)

appearance / physical state / colour
Type of information:
other: Handbook data.
Adequacy of study:
key study
Study period:
2 (reliable with restrictions)
Rationale for reliability incl. deficiencies:
data from handbook or collection of data
no guideline followed
Version / remarks:
Handbook data.
Principles of method if other than guideline:
Principle of method not specified; handbook data.
GLP compliance:
not specified
Physical state at 20°C and 1013 hPa:
colourless to pale blue
Substance type:
natural substance
Ozone is a colourless to pale blue gas with pungent odour at 20 °C.
Executive summary:

Ozone is a natural substance present in the earth's atmosphere (formed photochemically). At 20°C, ozone is a blue gas, but at the concentrations at which it is ordinarily produced, this colour is not noticeable unless the gas is viewed through a considerable depth. Ozone gas has a pungent, characteristic odour.

Description of key information

Ozone is a colourless to pale blue gas with pungent odour at 20 °C.

Key value for chemical safety assessment

Physical state at 20°C and 1013 hPa:

Additional information