According to the Commission, around 40% to 80% of mercury deposited in Europe comes from emissions in other parts of the world.
The 27 European Union nations handling Britain’s exit from the bloc set a tough negotiating mandate for the talks.
France, along with Spain, Greece, Britain, will continue to face disciplinary procedures for its excessive budget deficit.
The European Union is urging member states to take advantage of the bloc's recovering economy to strengthen public finances.
Athens needs funds to repay 7.5 billion euros of debt maturing in July
David Davis has warned that Britain will walk away from the Brexit negotiating table unless the EU drops calls for the UK to cough up €100bn when it leaves.
France's new Armed Forces Minister Sylvie Goulard has vowed to press ahead with European defence projects and work more closely with Germany.
Turkish President Erdogan will meet with top European Union officials in Brussels to discuss relations between both sides before the NATO summit.
The chancellor and her finance minister are set to push for Bundesbank President Jens Weidmann to become the fourth guardian of the single currency.
European Union officials are preparing for talks on Britain's exit from the bloc to begin on June 19 but expect confirmation of the date only after the British election on June 8.