Substances stable in the atmosphere

Substances stable in the atmosphere are synthetic compounds with a high global warming potential and a long residence time in the atmosphere. Emissions of substances stable in the atmosphere thus contribute to global warming. Their use in Switzerland is regulated in Annex 1.5 of the Chemicals Risk Reduction Ordinance (ORRChem).

Legal basis

Annex 1.5: Chemical Risk Reduction Ordinance (ORRChem)

- Substances stable in the atmosphere

Substances stable in the atmosphere include (according to Annex 1.5, number 1, paragraph 1 ORRChem):

hydrofluorocarbons (HFC) pursuant to Annex F of the Montreal Protocol;
other fluorinated organic compounds with a vapour pressure of at least 0.1 mbar at 20ºC or whose boiling point does not exceed 240ºC at 1013.25 mbar, and which have a mean atmospheric lifetime of at least 2 years ;
sulphur hexafluoride (SF₆); and
nitrogen trifluoride (NF₃).

List of most important substances and preparations stable in the atmosphere according to ORRChem 1.5 (PDF, 230 kB, 31.01.2023)(available in German, French and Italian)

For these substances, the following regulations apply:

Prohibitions

The use of substances stable in the atmosphere is prohibited (Annex 1.5, number 6.1 ORRChem). The placing on the market, including the import, of preparations and articles containing such substances is also prohibited (Annex 1.5, number 4.1 ORRChem).

Exemptions

There are direct exemptions from the ban on the use of substances stable in the atmosphere for certain uses in accordance with Annex 1.5, number 6.2, paragraphs 1 and 2 of the ORRChem.

Furthermore, the above-mentioned bans do not apply to the placing on the market of preparations and articles and to the use of substances stable in the atmosphere, if permitted under in accordance with the following Annexes of the ORRChem:

In addition, the FOEN may grant an exemption permit for further uses of substances stable in the atmosphere on a well-founded application if, according to the state of the technology, no substitute is available, the quantity and global warming potential of the substances stable in the atmosphere used are no greater than is necessary for the intended purpose according to the state of the technology, and emissions of substances stable in the atmosphere are kept as low as possible throughout the life cycle of the intended use (Annex 1.5, 6.3, ORRChem).