The Montreal Protocol on Substances that Deplete the Ozone Layer
Article 3: Calculation of control levels
For the purposes of Articles 2, 2A to 2I and 5, each Party shall, for each group of substances in Annex A, Annex B, Annex C or Annex E determine its calculated levels of:
- Production by:
- multiplying its annual production of each controlled substance by the ozone depleting potential specified in respect of it in Annex A, Annex B, Annex C or Annex E;
- adding together, for each such Group, the resulting figures;
- Imports and exports, respectively, by following, mutatis mutandis, the procedure set out in subparagraph (a); and
- Consumption by adding together its calculated levels of production and imports and subtracting its calculated level of exports as determined in accordance with subparagraphs (a) and (b). However, beginning on 1 January 1993, any export of controlled substances to non-Parties shall not be subtracted in calculating the consumption level of the exporting Party.