Department of Occupational Health Engineering;
Faculty of Medical Sciences;
Tarbiat Modares University;
Tehran;
Iran;
Department of Polyurethane;
Iran Polymer and Petrochemical Institute;
Tehran;
Iran;
Research Center for Environmental Health Technology;
Department of Environmental Health Engineering;
Iran University of Medical Sciences;
Tehran;
Iran;
Department of Occupational Health and Safety at Work;
Workplace Health Promotion Research Center;
School of Public Health and Safety;
Shahid Beheshti University of Medical Sciences;
Tehran;
Iran;
Sound absorption coefficient; flexible polyurethane foam; nano clay; polyacrylonitrile nanofibers; polyvinyl fluoride nanofibers;