II.
Reference method for the analysis of carbon monoxide The reference method for the measurement of carbon monoxide will be the non-dispersive infra-red spectometric (NDIR) method, that is currently being standardised by CEN. In the absence of a CEN standardised method, the Member States are allowed to use national standard methods based on the same measurement method. A Member State may also use any other method which it can demonstrate gives results equivalent to the above method.
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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.