1. NEC Directive Status Report 2013,2014
2. Air Pollution Still Harming Health Across Europehttp://www.eea.europa.eu/media/newsreleases/air-pollution-still-causing-harm
3. Luchtkwaliteit: Een Europees Perspectief;Bruyninckx,2014
4. Directive 2008/50/EC on ambient air quality and cleaner air for Europe;Off. J. Eur. Union,2008
5. Commission Refers Belgium and Bulgaria to Court and Gives Sweden a Final Warning Over Poor Air Qualityhttp://europa.eu/rapid/press-release_IP-15-5197_en.htm