(Art. 3 para. 1)
1The provisions of this Annex apply to the preventive limiting of emissions from stationary installations.
2They are without prejudice to the additional or different provisions applicable for:
Flue gases means waste air, flue gases and other air pollutants discharged by installations.
Emissions are expressed in the following terms:
1The limit values expressed as concentrations and the oxygen contents given as reference values are based on the volume of flue gas under standard conditions (0 °C, 1013 mbar) after deduction of the moisture content (dry).
2The limit values expressed as emission concentrations are based on the amount of flue gas which is no more heavily diluted than is technically and operationally unavoidable.
3If oxygen content by volume is given as the reference value for an installation listed in Annexes 2–4, the measured emission concentrations are to be corrected to this reference value.
The rated thermal input is the maximum thermal energy that can be supplied to an installation per unit time. It is obtained by multiplying the fuel consumption of the installation by the lower calorific value of the fuel.
1The following emission limitation requirements apply:
2Substances not listed in Numbers 5–8 shall be assigned to the substance classes which have comparable effects on the environment. Account shall be taken in particular of degradability and bio-accumulability, toxicity, the effects of decomposition processes and transformation products, and odour intensity.
1If there is more than one emission source and if emission limitation requirements depend on the size of an installation (e.g. capacity or mass flow), the authorities shall determine which emission sources shall collectively be considered to constitute a single installation.
2Emission sources are generally to be considered as a single installation if they are situated in close proximity to each other and if their emissions:
3Parts of an installation which only serve as back-ups in the event of malfunctions are not taken into account when determining the size of the installation.
4Emission limit values which depend on a certain mass flow shall only apply if:
If the mass flow of dust is 0.20 kg/h or more, total dust emissions must not exceed 20 mg/m3.
The requirements specified in Numbers 5, 7 and 8 apply to the limitation of emissions of individual components of dust.
1If significant dust emissions may occur in commercial or industrial facilities as a result of processes such as the conveyance, crushing, sorting or filling of dust-forming materials, the dust-containing flue gases must be captured and fed into a dust removal system.
2When dust-forming materials are stored or trans-shipped in the open, measures must be taken to prevent significant dust emissions.
3When dust-forming materials are transported, transport equipment must be used which prevents significant dust emissions.
4If traffic on factory roads may cause significant dust emissions, the roads must be kept free of dust.
1The emission concentration of the substances listed in Number 52 must not exceed the following values: a. Class 1 substances at a mass flow of 1 g/h or more 0.2 mg/m3 b. Class 2 substances at a mass flow of 5 g/h or more 1 mg/m3 c. Class 3 substances at a mass flow of 25 g/h or more 5 mg/m3
2The limit values apply to the total mass of an emitted substance, including gaseous and vaporous components in the flue gas.
3If the flue gas contains several substances belonging to the same class, the limit value applies to the sum of these substances.
| Substance | Expressed as | Class | |
|---|---|---|---|
| Antimony1 | and its compounds | Sb | 3 |
| Arsenic1 | and its compounds, except arsine | As | 2 |
| Chromium1 | and its compounds | Cr | 3 |
| Cobalt1 | and its compounds | Co | 2 |
| Copper | and its compounds | Cu | 3 |
| Cyanides2 | CN | 3 | |
| Fluorides2 | in dust form | F | 3 |
| Lead | and its compounds | Pb | 3 |
| Manganese | and its compounds | Mn | 3 |
| Mercury | and its compounds | Hg | 1 |
| Nickel1 | and its compounds | Ni | 2 |
| Palladium | and its compounds | Pd | 3 |
| Platinum | and its compounds | Pt | 3 |
| Rhodium | and its compounds | Rh | 3 |
| Silica dust | in fine crystalline form | SiO | 3 |
| Selenium | and its compounds | Se | 2 |
| Tellurium | and its compounds | Te | 2 |
| Thallium | and its compounds | Tl | 1 |
| Tin | and its compounds | Sn | 3 |
| Vanadium | and its compounds | V | 3 |
| 1 If not listed as a carcinogenic compound under Number 8. 2 If readily soluble. |
The emission concentration of any of the substances listed in Number 62 must not exceed the following values: a. For a Class 1 substance at a mass flow of 10 g/h or more 1 mg/m3 b. For a Class 2 substance at a mass flow of 50 g/h or more 5 mg/m3 c. For a Class 3 substance at a mass flow of 300 g/h or more 30 mg/m3 d. For a Class 4 substance at a mass flow of 2500 g/h or more 250 mg/m3
| Substance | Class |
|---|---|
| Ammonia and ammonium compounds, expressed as ammonia | 3 |
| Arsine | 1 |
| Bromine and its gaseous or vaporous compounds, expressed as hydrogen bromide | 2 |
| Chlorine | 2 |
| Chlorine compounds, vaporous or gaseous inorganic chlorine compounds except cyanogen chloride and phosgene, expressed as hydrogen chloride | 3 |
| Cyanogen chloride | 1 |
| Fluorine and its vaporous or gaseous compounds, expressed as hydrogen fluoride | 2 |
| Hydrogen cyanide | 2 |
| Hydrogen phosphide | 1 |
| Hydrogen sulphide | 2 |
| Nitrogen oxides (nitrogen monoxide and nitrogen dioxide), expressed as nitrogen dioxide | 4 |
| Phosgene | 1 |
| Sulphur oxides (sulphur dioxide and sulphur trioxide), expressed as sulphur dioxide | 4 |
1The emission concentration of the substances listed in Number 72 must not exceed the following values: a. Class 1 substances at a mass flow of 0.1 kg/h or more 20 mg/m3 b. Class 2 substances at a mass flow of 2.0 kg/h or more 100 mg/m3 c. Class 3 substances at a mass flow of 3.0 kg/h or more 150 mg/m3
2Notwithstanding paragraph 1, the provisions on dust limitation specified in Number 41 apply to Class 2 and Class 3 organic substances in particulate form.
3If the flue gas contains several substances belonging to the same class, the limit value applies to the sum of these substances.
4If the flue gas contains substances of different classes, the sum of the substances at a total mass flow of 3.0 kg/h or more must not exceed the limit value of 150 mg/m3, in addition to the requirements specified in paragraphs 1 and 2.
5Emissions of substances for which there is good cause to believe that they are carcinogenic2and which are not listed as Class 1 substances in the Table under Number 72 must be controlled in accordance with paragraph 1 letter a.
6Emissions of substances which are classified as ozone depleting substances in Annex 1.4 of the Ordinance of 18 May 20053on Chemical Risk Reduction, but which are not listed as Class 1 substances in the Table under Number 72, must be controlled in accordance with paragraph 1 letter a. This is without prejudice to the provisions of Number 8.
| Substance | Molecular formula | Class |
|---|---|---|
| Acetaldehyde | C | 1 |
| Acetic acid | C | 2 |
| Acetic acid butyl ester (see Butyl acetate) | ||
| Acetic acid ethyl ester (see Ethyl acetate) | ||
| Acetic acid methyl ester (see Methyl acetate) | ||
| Acetic acid vinyl ester (see Vinyl acetate) | ||
| Acetic ester (see Ethyl acetate) | ||
| Acetone | C | 3 |
| Acrolein (see 2-Propenal) | ||
| Acrylic acid | C | 1 |
| Acrylic acid ethyl ester (see Ethyl acrylate) | ||
| Acrylic acid methyl ester (see Methyl acrylate) | ||
| Alkanes, except methane | 3 | |
| Alkenes, except 1,3-butadiene and ethene | 3 | |
| Alkyl alcohols | 3 | |
| Alkyl lead compounds | 1 | |
| Aniline | C | 1 |
| Benzoic acid methyl ester (see Methyl benzoate) | ||
| Biphenyl | C | 1 |
| Bis(2-ethylhexyl)phthalate (see Di(2-ethylhexyl)phthalate) | ||
| Bromomethane | CH | 1 |
| 2-Butanone | C | 3 |
| 2-Butoxyethanol | C | 2 |
| Butyl acetate | C | 3 |
| Butyl glycol (see 2-Butoxyethanol) | ||
| Butyraldehyde | C | 2 |
| Carbon disulphide | CS | 2 |
| Carbon tetrachloride (see Tetrachloromethane) | ||
| CFCs, chlorofluorocarbons, fully halogenated, with up to 3 C atoms | 1 | |
| Chloroacetaldehyde | C | 1 |
| Chlorobenzene | C | 2 |
| Chloroacetic acid | C | 1 |
| Chloroethane | C | 1 |
| Chloromethane | CH | 1 |
| Chloroform (see Trichloromethane) | ||
| 2-Chloroprene (see 2-Chloro-1,3-butadiene) | ||
| 2-Chloropropane | C | 2 |
| Cresols | C | 1 |
| Cumene (see Isopropylbenzene) | ||
| Cyclohexanone | C | 1 |
| Diacetone alcohol (see 4-Hydroxy-4-methyl-2-pentanone) | ||
| Dibutyl ether | C | 3 |
| 1,2-Dichlorobenzene | C | 1 |
| 1,1-Dichloroethane | C | 2 |
| 1,1-Dichloroethene | C | 1 |
| 1,2-Dichloroethene | C | 3 |
| Dichloromethane | CH | 1 |
| Dichlorophenols | C | 1 |
| Diethanolamine (see 2,2'-Iminodiethanol) | ||
| Diethylamine | C | 1 |
| Diethyl ether | C | 3 |
| Di(2-ethylhexyl)phthalate | C | 2 |
| Diisopropyl ether | C | 3 |
| Diisobutyl ketone (see 2,6-Dimethyl-4-heptanone) | ||
| Dimethylamine | C | 1 |
| Dimethyl ether | C | 3 |
| N,N-Dimethylformamide | C | 2 |
| 2,6-Dimethyl-4-heptanone | C | 2 |
| Dioctyl phthalate (see Di(2-ethylhexyl)phthalate) | ||
| 1,4-Dioxane | C | 1 |
| Diphenyl (see Biphenyl) | ||
| Ethanol (see Alkyl alcohols) | ||
| Ethene | C | 1 |
| Ether (see Diethyl ether) | ||
| 2-Ethoxyethanol | C | 2 |
| Ethyl acetate | C | 3 |
| Ethyl acrylate | C | 1 |
| Ethylamine | C | 1 |
| Ethylbenzene | C | 2 |
| Ethyl chloride (see Chloroethane) | ||
| Ethylene glycol | C | 3 |
| Ethylene glycol monobutyl ether (see 2-Butoxyethanol) | ||
| Ethylene glycol monoethyl ether (see 2-Ethoxyethanol) | ||
| Ethylene glycol monomethyl ether (see 2-Methoxyethanol) | ||
| Ethyl glycol (see 2-Ethoxyethanol) | ||
| Ethyl methyl ketone (see 2-Butanone) | ||
| Formaldehyde | CH | 1 |
| Formic acid | CH | 1 |
| Formic acid dimethyl amide (see N,N-Dimethylformamide) | ||
| Formic acid methyl ester (see Methyl formate) | ||
| 2-Furaldehyde | C | 1 |
| Furfural (see 2-Furaldehyde) | ||
| Furfuryl alcohol | C | 2 |
| Glycol (see Ethylene glycol) | ||
| Halons, bromofluorocarbons, fully halogenated, with up to 3 C atoms | 1 | |
| HBFCs, hydrobromofluorocarbons, partially halogenated, with up to 3 C atoms | 1 | |
| HCFCs, hydrochlorofluorocarbons, partially halogenated, with up to 3 C atoms | 1 | |
| 4-Hydroxy-4-methyl-2-pentanone | C | 3 |
| 2,2'-Iminodiethanol | C | 2 |
| Isopropenylbenzene | C | 2 |
| Isopropylbenzene | C | 2 |
| Maleic anhydride | C | 1 |
| Mercaptans (see Thiols) | ||
| Methacrylic acid methyl ester (see Methyl methacrylate) | ||
| Methanol (see Alkyl alcohols) | ||
| 2-Methoxyethanol | C | 2 |
| Methyl acetate | C | 2 |
| Methyl acrylate | C | 1 |
| Methylamine | CH | 1 |
| Methyl benzoate | C | 3 |
| Methyl chloride (see Chloromethane) | ||
| Methyl chloroform (see 1,1,1,-Trichloroethane) | ||
| Methylcyclohexanone | C | 2 |
| Methylene chloride (see Dichloromethane) | ||
| Methyl ethyl ketone (see 2-Butanone) | ||
| Methyl formate | C | 2 |
| Methyl glycol (see 2-Methoxyethanol) | ||
| Methyl isobutyl ketone (see 4-Methyl-2-pentanone) | ||
| Methyl methacrylate | C | 2 |
| 4-Methyl-2-pentanone | C | 3 |
| 4-Methyl-m-phenylene diisocyanate | C | 1 |
| N-Methyl pyrrolidone | C | 3 |
| Naphthalene | C | 1 |
| Nitrobenzene | C | 1 |
| Nitrocresols | C | 1 |
| Nitrophenols | C | 1 |
| Nitrotoluenes*,* except 2-nitrotoluene | C | 1 |
| Olefin hydrocarbons (see Alkenes) | 3 | |
| Paraffin hydrocarbons (see Alkanes) | 3 | |
| Perchloroethylene (see Tetrachloroethylene) | ||
| Phenol | C | 1 |
| Phthalic acid dioctyl ester (see Di(2-ethylhexyl)phthalate) | ||
| Pinenes | C | 3 |
| 2-Propenal | C | 1 |
| Propionaldehyde | C | 2 |
| Propionic acid | C | 2 |
| Pyridine | C | 1 |
| Styrene | C | 2 |
| 1,1,2,2-Tetrachloroethane | C | 1 |
| Tetrachloroethylene | C | 1 |
| Tetrachloromethane | CCl | 1 |
| Tetrahydrofuran | C | 2 |
| Thiols | 1 | |
| Thioether | 1 | |
| Toluene | C | 2 |
| Toluene diisocyanate (see 4-Methyl-m-phenylene diisocyanate) | ||
| Tolylene-2,4-diisocyanate (see 4-Methyl-m-phenylene diisocyanate) | ||
| 1,1,1-Trichloroethane | C | 1 |
| 1,1,2-Trichloroethane | C | 1 |
| Trichloromethane | CHCl | 1 |
| Trichlorophenols | C | 1 |
| Triethylamine | C | 1 |
| Trimethylbenzenes | C | 2 |
| Vinyl acetate | C | 1 |
| Wood dust, respirable (except beech and oak wood dust) | 1 | |
| Xylenols, except 2,4-xylenol | C | 1 |
| 2,4-Xylenol | C | 2 |
| Xylenes | C | 2 |
Carcinogens means those substances that are designated as carcinogenic (C) in the list of limit values for exposure at the workplace4published by the Swiss Accident Insurance Fund (SUVA).
1Irrespective of the risk of carcinogen exposure, emissions of carcinogens shall be limited as far as is technically and operationally feasible and economically acceptable.
2Emissions of the carcinogens listed in Number 83 shall be limited at least to such an extent that emission concentrations do not exceed the following values: a. Class 1 substances at a mass flow of 0.5 g/h or more 0.1 mg/m3 b. Class 2 substances at a mass flow of 5 g/h or more 1 mg/m3 c. Class 3 substances at a mass flow of 25 g/h or more 5 mg/m3
3If the flue gas contains several substances belonging to the same class, the limitation requirements specified in paragraph 2 apply to the sum of these substances.
| Substance | Molecular formula | Class |
|---|---|---|
| Acrylonitrile | C | 3 |
| Antimony trioxide (in respirable form), expressed as Sb | Sb | 2 |
| Arsenic trioxide and arsenic pentoxide, arsenious acid and its salts, arsenic acid and its salts (in respirable form), expressed as As | As | 2 |
| Asbestos (chrysotile, crocidolite, amosite, anthophyllite, actinolite, tremolite) in the form of fine dust | 1 | |
| Beech wood dust, respirable | 3 | |
| Benzene | C | 3 |
| Benzo[a]pyrene | C | 1 |
| Beryllium and its compounds in respirable form, expressed as Be | Be | 1 |
| Bromomethane | C | 3 |
| 1,3-Butadiene | C | 3 |
| Cadmium and its compounds cadmium chloride, cadmium oxide, cadmium sulphate, cadmium sulphide, and other bioavailable compounds (in respirable form), expressed as Cd | Cd | 1 |
| 2-Chloro-1,3-butadiene | C | 3 |
| 1-Chloro-2,3-epoxypropane | C | 3 |
| α-Chlorotoluene | C | 3 |
| α-Chlorotoluenes; mixtures of -chlorotoluene, α, α‑dichlorotoluene, α, α, α-trichlorotoluene and benzyl chloride | 3 | |
| Chromium(VI) compounds (in respirable form) as calcium chromate, chromium(III) chromate, strontium chromate and zinc chromate, expressed as Cr | Cr | 2 |
| Cobalt (in the form of respirable dusts or aerosols of cobalt metal and poorly soluble cobalt salts), expressed as Co | Co | 2 |
| Dibenzo(a,h)anthracene | C | 1 |
| 1,2-Dibromoethane | C | 3 |
| 1,4-Dichlorobenzene | C | 3 |
| 3,3’-Dichlorobenzidine | C | 2 |
| 1,2-Dichloroethane | C | 3 |
| Diesel soot | 3 | |
| Diethyl sulphate | C | 2 |
| Dimethyl sulphate | C | 2 |
| Epichlorohydrin (see 1-Chloro-2,3-epoxypropane) | ||
| 1,2-Epoxypropane | C | 3 |
| Ethylene imine | C | 2 |
| Ethylene oxide | C | 3 |
| Hydrazine | H | 3 |
| 2-Naphthylamine | C | 1 |
| Nickel (in the form of respirable dusts or aerosols of nickel metal, nickel sulphide and sulphide ores, nickel oxide and nickel carbonate, nickel tetracarbonyl), expressed as Ni | Ni | 2 |
| 2-Nitrotoluene | C | 3 |
| Oak wood dust, respirable | 3 | |
| o-Toluidine | C | 3 |
| Trichlorethylene | C | 3 |
| Vinyl chloride | C | 3 |
| N-Vinyl-2-pyrrolidone | C | 3 |
As a result of the amendment to Annex 4 this let. is obsolete (AS 2021 632). ↩
Substances for which there is good cause to believe that they are carcinogenic means in particular those substances contained in Section III of the «List of MAK and BAT Values» (Maximum Concentrations and Biological Tolerance Values at the Workplace) issued by the German Research Foundation (DFG). Available from: VCH Verlags-AG, Postfach, CH‑4020 Basel. ↩
SR 814.81 ↩
List of limit values for exposure at the workplace, available from: Schweizerische Unfallversicherungsanstalt SUVA, Postfach, 6002 Luzern. ↩
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