S.L. 549.11 Art. 6Measurement of ozone concentrations.

(1) For the measurement of ozone concentrations, the competent authority or the measuring stations shall use:

(a) either the reference method specified in Annex V;

(b) or any other method of analysis shown to produce measurement results equivalent to those obtained using the reference method.

(2) The competent authority shall designate one or more laboratories responsible for evaluating the method used at national level in relation to the reference method mentioned in these regulations.

(3) The competent authority shall organise at national level inter-comparisons between laboratories taking part in the collection and analysis of the data.