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14 September apply arising from benzene atmosphere benzene content benzene fumes benzene or substances benzene poisoning benzene vapours benzols blood tests canton of Geneva cent by volume cent by weight cent of benzene chemical industry cleaning clothes competent authority concentration of benzene containing benzene hydrocarbons Convention provide Council of Europe countries dangerous degreasing diluents distillation employed employer exposed to benzene fume process Geneva glues governing harmful substances hazards arising homologues inks intervals label lays down article lays down section mastics maximum permissible concentration national laws occupational disease Occupational Hygiene operations Order of 25 Ordinance periodical medical examinations petroleum spirits preparation prescribed preventive measures prohibited Recommendation provide rotogravure printing rubber solutions six months solvents specified spray painting substances containing benzene suggestions concerning possible technical precautions technical prevention tions toluene and xylene toluene or xylene toxic toxic substances unhealthy varnishes ventilation workers exposed workplaces xylol young persons