47With regard to Directive 2008/50, the location of sampling points is central to the air quality assessment and improvement system it provides for, in particular where the level of pollution exceeds the upper assessment threshold referred to in Articles 5 and 6 thereof. As noted in paragraph 36 above, in that case, in accordance with Article 6(2) of Directive 2008/50, sampling points are the main instrument for assessing air quality.
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