2.
The reference conditions for Wobbe index and gross calorific value shall be the following: (a) combustion reference temperature: 15 °C; (b) volume measurement reference temperature: 15 °C; (c) volume measurement reference pressure: 1013,25 mbar.
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Source: EUR-Lex (Cellar) · retrieved 2026-11-01 · Text as adopted (Official Journal); later amendments are not incorporated in this text.