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These rules both contribute to harmonising the working conditions and securing the welfare and health of workers , as well as to equalising the competitive posision of companies in the internal market . " Protecting the safety and health of workers is a primary concern and responsibility of employers and the failure to do so in this case is unacceptable , " said U.S. Secretary of Labor Elaine L. Chao . Since September 11 , our staff has worked diligently , and often around the clock , to ensure the safety and health of workers at the World Trade Center site . The safety and health of workers is paramount to a vibrant and effective workforce . " As far as it is compatible with existing national laws and regulations , " the employer shall have a duty to ensure the safety and health of workers in every aspect related to the work .