The Montreal Protocol on Substances that Deplete the Ozone Layer

The Montreal Protocol on Substances that Deplete the Ozone Layer is a global agreement to protect the Earth’s ozone layer by phasing out the chemicals that deplete it. This phase-out plan includes both the production and consumption of ozone-depleting substances. The landmark agreement was signed in 1987 and entered into force in 1989.

The parties to the Protocol meet once a year to make decisions aimed at ensuring the successful implementation of the agreement. These include adjusting or amending the Protocol, which has been done six times since its creation. The most recent amendment, the Kigali Amendment, called for the phase-down of hydrofluorocarbons (HFCs) in 2016. These HFCs were used as replacements for a batch of ozone-depleting substances eliminated by the original Montreal Protocol. Although they do not deplete the ozone layer, they are known to be powerful greenhouse gases and, thus, contributors to climate change.

The Montreal Protocol provided a set of practical, actionable tasks that were universally agreed on. The Protocol has successfully met its objectives thus far and continues to safeguard the ozone layer today. Thanks to the collaborative effort of nations around the world, the ozone layer is well on its way to recovery.

Decision XIX/15: Replacement of table A and table A‑bis in relevant process agent decisions

1. To adopt the table in the annex to the present decision as a list of process agent applications to replace table A of decision X/14 as it was amended in decision XVII/7 and to replace tableA‑bis in decision XVII/8.

Annex to decision XIX/15 Table A. List of uses of controlled substances as process agents

 

Process

ODS

1

Elimination of NCl3 in chlor-alkali production

CTC

2

Chlorine recovery by tail gas absorption in chlor-alkali production

CTC

3

Production of chlorinated rubber

CTC

4

Production of endosulfan

CTC

5

Production of ibuprofen

CTC

6

Production of dicofol

CTC

7

Production of chlorosulfonated polyolefin (CSM)

CTC

8

Production of aramid polymer (PPTA)

CTC

9

Production of synthetic fibre sheet

CFC‑11

10

Production of chlorinated paraffin

CTC

11

Photochemical synthesis of perfluoropolyetherpolyperoxide precursors of Z‑perfluoropolyethers and difunctional derivatives

CFC‑12

12

Reduction of perfluoropolyetherpolyperoxide intermediate for production of perfluoropolyether diesters

CFC‑113

13

Preparation of perfluoropolyether diols with high functionality

CFC‑113

14

Production of cyclodime

CTC

15

Production of chlorinated polypropene

CTC

16

Production of chlorinated EVA

CTC

17

Production of methyl isocyanate derivatives

CTC

18

Production of 3-phenoxybenzaldehyde

CTC

19

Production of 2-chloro-5-methylpyridine

CTC

20

Production of imidacloprid

CTC

21

Production of buprofenzin

CTC

22

Production of oxadiazon

CTC

23

Production of chloradized N-methylaniline

CTC

24

Production of 1,3-dichlorobenzothiazole

CTC

25

Bromination of a styrenic polymer

BCM

26

Synthesis of 2,4-D (2,4- dichlorophenoxyacetic acid)

CTC

27

Synthesis of DEHPC (di-(2-ethylhexyl) peroxydicarbonate)

CTC

28

Production of radio-labelled cyanocobalamin

CTC

29

Production of high modulus polyethylene fibre

CFC‑113

30

Production of vinyl chloride monomer

CTC

31

Production of sultamicillin

BCM

32

Production of prallethrin (pesticide)

CTC

33

Production of o-nitrobenzaldehyde (for dyes)

CTC

34

Production of 3-methyl-2-thiophenecarboxaldehyde

CTC

35

Production of 2-thiophenecarboxaldehyde

CTC

36

Production of 2-thiophene ethanol

CTC

37

Production of 3,5-dinitrobenzoyl chloride (3,5-DNBC)

CTC

38

Production of 1,2-benzisothiazol-3-ketone

CTC

39

Production of m-nitrobenzaldehyde

CTC

40

Production of tichlopidine

CTC

41

Production of p-nitro benzyl alcohol

CTC

42

Production of tolclofos methyl

CTC