ANNEX IV

LOCATION OF SAMPLING POINTS FOR THE MEASUREMENT OF CONCENTRATIONS OF BENZENE AND CARBON MONOXIDE IN AMBIENT AIR The following considerations will apply to fixed measurement. Macroscale siting Sampling points directed at the protection of human health should be sited: Sampling points should also, where possible, be representative of similar locations not in their immediate vicinity. Account should be taken of the need to locate sampling points on islands, where that is necessary for the protection of human health. 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); to provide data on levels in other areas within the zones and agglomerations which are representative of the exposure of the general population. Sampling points should in general be sited to avoid measuring very small micro-environments in their immediate vicinity. As a guideline, a sampling point should be sited to be representative of air quality in a surrounding area of no less than 200 m2 at traffic-orientated sites and of several square kilometres at urban-background sites. Microscale siting The following guidelines should be met as far as practicable: the flow around the inlet sampling probe should be unrestricted, without any obstructions affecting the airflow in the vicinity of the sampler (normally some metres away from buildings, balconies, trees and other obstacles and at least 0,5 m from the nearest building in the case of sampling points representing air quality at the building line); in general, the inlet sampling point should be between 1,5 m (the breathing zone) and 4 m above the ground. Higher positions (up to 8 m) may be necessary in some circumstances. Higher siting may also be appropriate if the station is representative of a large area; the inlet probe should not be positioned in the immediate vicinity of sources in order to avoid direct intake of emissions unmixed with ambient air; the sampler's exhaust outlet should be positioned so that recirculation of exhaust air to the sample inlet is avoided; location of traffic-orientated samplers: for all pollutants, such sampling points should be at least 25 metres from the edge of major junctions and at least 4 m from the centre of the nearest traffic lane; for carbon monoxide, inlets should be no more than 5 m from the kerbside; for benzene, inlets should be sited so as to be representative of air quality near to the building line. The following factors may also be taken into account: interfering sources; security; access; availability of electrical power and telephone communications; visibility of the site in relation to its surroundings; safety of public and operators; the desirability of co-locating sampling points for different pollutants; planning requirements. Documentation and review of site selection The site selection procedures should be fully documented at the classification stage by such means as compass-point photographs of the surrounding area and a detailed map. Sites should be reviewed at regular intervals with repeated documentation to ensure that selection criteria remain valid over time.

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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.