National and European regulations (EC/850/ 2004) prohibit the production, marketing and use of substances covered by the Convention. Since 2001, the limit values for emissions of dioxins, furans and PAHs have been exceeded several times. A bio-monitoring network has been in place around major industrial sites since 1995. For dioxins, furans and PCBs: i) the sanitary action threshold applicable to washed vegetables for human consumption (beyond which consumption is not recommended) has not been exceeded since 2003, while ii) the sanitary prevention threshold has been exceeded each year at Schifflange and on several occasions at Esch/Alzette.