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12.

The average values over the sample period and the average values in the case of periodical measurements of HF, HCl and SO2 shall be determined in accordance with the requirements of Article 10(2) and (4) and Annex III.

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Source: EUR-Lex (Cellar) · retrieved 2026-10-12 · Text as adopted (Official Journal); later amendments are not incorporated in this text.