“…The cause of SBS is not caused by a single factor, but it is always associated with several factors, such as poor ventilation, outdoor and indoor air quality, biological contaminants, allergy, gender, smoking, workload, as reported in China, United Kingdom, Iran, Sweden and Turkey (Arikan et al, 2018;Belachew et al, 2018;Jafakesh et al, 2019). A study conducted by Occupational Safety and Health Administration (OSHA) reported that SBS can be caused by several factors in a building, for example due to inadequate ventilation (52%), indoor contaminants (16%), outdoor contaminants (10%), presence of microbes (5%), pollution from building materials (4%) and others (13%) (OSHA, 2011).…”