Sampling points directed at the protection of human health should be sited:
(i) to provide data on the areas within zones and agglomerations where the highest concentrations occur to which the population is likely to be directly or indirectly exposed for a period which is significant in relation to the averaging period of the limit value(s);
(ii) to provide data on levels in other areas within the zones and agglomerations which are representative of the exposure of the general population.
