Search for: [References = "5. EUR\-LEX, 2008. Directive 2008\/50\/EC of the European Parliament and of the Council of 21 May 2008 on ambient air quality and cleaner air for Europe. https\:\/\/eur\-lex.europa.eu\/legalcontent\/EN\/TXT\/\?uri=celex%3A32008L0050 \[17 December 2018\]."]

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