| Entry into force: | 2 September 1987, in accordance with article 11 (1). |
| Registration: | 2 September 1987, No. 25247. |
| Status: | Signatories: 19 ,Parties: 23. |
| Text: | United Nations, Treaty Series, vol. 1480, p. 215. |
Note: The Protocol was drawn up within the framework of the Economic Commission for Europe and was adopted on 8 July 1985 by the Executive Body for the Convention on Long-Range Transboundary Air Pollution. It was open for signature at Helsinki from 8 to 12 July 1985.
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| Participant | Signature | Ratification, Acceptance (A), Approval (AA), Accession (a), Succession (d) |
| Austria | 9 Jul 1985 | 4 Jun 1987 |
| Belarus | 9 Jul 1985 | 10 Sep 1986 A |
| Belgium | 9 Jul 1985 | 9 Jun 1989 |
| Bulgaria | 9 Jul 1985 | 26 Sep 1986 AA |
| Canada | 9 Jul 1985 | 4 Dec 1985 |
| Czech Republic1 | 30 Sep 1993 d | |
| Denmark | 9 Jul 1985 | 29 Apr 1986 |
| Estonia | 7 Mar 2000 a | |
| Finland | 9 Jul 1985 | 24 Jun 1986 |
| France | 9 Jul 1985 | 13 Mar 1986 AA |
| Germany2,3 | 9 Jul 1985 | 3 Mar 1987 |
| Hungary | 9 Jul 1985 | 11 Sep 1986 |
| Italy | 9 Jul 1985 | 5 Feb 1990 |
| Liechtenstein | 9 Jul 1985 | 13 Feb 1986 |
| Lithuania | 15 Mar 2007 a | |
| Luxembourg | 9 Jul 1985 | 24 Aug 1987 |
| Netherlands4 | 9 Jul 1985 | 30 Apr 1986 A |
| Norway | 9 Jul 1985 | 4 Nov 1986 |
| Russian Federation | 9 Jul 1985 | 10 Sep 1986 A |
| Slovakia1 | 28 May 1993 d | |
| Sweden | 9 Jul 1985 | 31 Mar 1986 |
| Switzerland | 9 Jul 1985 | 21 Sep 1987 |
| Ukraine | 9 Jul 1985 | 2 Oct 1986 A |
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1. Czechoslovakia had signed and approved the Protocol on 9 July 1985 and 26 November 1986, respectively. See also note 1 under "Czech Republic" and note 1 under "Slovakia" in the "Historical Information" section in the front matter of this volume.
2. The German Democratic Republic had signed and approved the Protocol on 9 July 1985 and 26 November 1986, respectively. See also note 2 under "Germany" in the "Historical Information" section in the front matter of this volume.
3. See note 1 under "Germany" regarding Berlin (West) in the "Historical Information" section in the front matter of this volume.