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The Air Quality Standards (Scotland) Regulations 2007

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PART 2Macroscale siting for Group B pollutants and polycyclic aromatic hydrocarbons

6.  The sites of sampling points shall be selected in such a way as to provide data on–

(a)the areas within zones where the population is likely to be directly or indirectly exposed to the highest concentrations averaged over a calendar year;

(b)concentrations in other areas within zones which are representative of the exposure of the general population;

(c)deposition rates representing the indirect exposure of the population through the food chain.

7.  Sampling points shall in general be sited so as to avoid measuring very small micro-environments in their immediate vicinity. Where possible, the Scottish Ministers shall locate sampling points so as to be representative of air quality in surrounding areas of no less than 200 m2 at traffic-orientated sites, at least 250 m × 250 m at industrial sites, where feasible, and several square kilometres at urban-background sites.

8.  Where the objective is to assess background levels the sampling site shall not be influenced by agglomerations or industrial sites in its vicinity, i.e. sites closer than a few kilometres (as the Scottish Ministers may determine in light of the circumstances of each case).

9.  Where contributions from industrial sources are to be assessed, at least one sampling point shall be installed downwind of the source in the nearest residential area. Where the background concentration is not known, an additional sampling point shall be situated within the main wind direction. In particular in cases falling within regulation 9(1)(a), the sampling points shall be sited such that the application of the measures referred to at regulation 7(2)(b) can be monitored.

10.  Sampling points shall also, where possible, be representative of similar locations not in their immediate vicinity. Where appropriate they shall be co-located with sampling points for PM10.

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