S.L. 549.59 Art. 11Method of assessing concentrations below the upper threshold.

(1) The competent authority shall assess the concentrations of group A and group B pollutants by a combination of fixed measurements and modelling techniques or indicative measurements in those zones and agglomerations where the concentration of these pollutants is below the upper assessment threshold but above the lower assessment threshold.

(2) In order to determine whether the concentrations of group B pollutants in the respective zones and agglomerations are within the concentration range in sub-regulation (1), the competent authority shall use the method in Section B of Schedule 2.

(3) In order to comply with the requirements of sub-regulation

(1) with respect to group B pollutants, the competent authority may use the indicative measurements referred to in Part I of Section B of Schedule 1.