136However, it follows from the second subparagraph of Article 23(1) of Directive 2008/50 that, while Member States have a degree of discretion in deciding which measures to adopt, those measures must, in any event, ensure that the period during which the limit values are exceeded is kept as short as possible (judgments of 5 April 2017, Commission v Bulgaria, C‑488/15, EU:C:2017:267, paragraph 109, and of 30 April 2020, Commission v Romania (Exceedance of limit values for PM10), C‑638/18, not published, EU:C:2020:334, paragraph 118 and the case-law cited).
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