150It is with that in mind that Article 23 of Directive 2008/50 requires that, where it has been established that the limit values for PM10 have been exceeded, such a situation should lead the Member State concerned as soon as possible not only to adopt but also to implement appropriate measures in an air quality plan, the discretion available to that Member State in the event of an exceedance of the limit values being accordingly, in that context, limited by that requirement.
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