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EUR-Lex -  61990CC0013 - EN - JOINED OPINIONS OF MR ADVOCATE GENERAL LENZ DELIVERED ON 11 JULY 1991. - COMMISSION OF THE EUROPEAN COMMUNITIES V FRENCH REPUBLIC. - FAILURE OF A MEMBER STATE TO FULFIL ITS OBLIGATIONS - LIMIT VALUE FOR LEAD IN THE AIR. - CASE C-13/90. - FAILURE TO FULFIL AN OBLIGATION - AIR QUALITY STANDARDS FOR NITROGEN DIOXIDE. - CASE C-14/90. - FAILURE TO FULFIL AN OBLIGATION - AIR QUALITY LIMIT VALUES AND GUIDE VALUES FOR SULPHUR DIOXIDE. - CASE C-64/90.