According to Enforcement Rules of the Occupational Safety and Health Act, employer have
an obligation to provide sufficient fresh air in the workplace. This study simulated the accumulation
of carbon dioxide (CO₂) under the current rule and discussed the feasibility of fresh air exchange
management. This study assumed the well-mixed models to simulate the accumulation of CO₂
with different air exchange rates at workplace. The concentration of CO₂ could be managed under
regulation by monitoring data. We found that simulation results were similar to monitoring data from
chamber experiment. Both of the average concentrations of CO₂ in the two and four hour and the
maximum concentration in four hour could exceed the regulated concentration of 1,000 ppm. The
CO₂ concentration would be affected by the ventilation volume and air exchange rate. Although the
current regulation had considered these factors, we should increase the ventilation volume to reach
the requirement of indoor air quality. We can also assess the consequences of ventilation and indoor
air quality by CO₂ monitoring data. In addition, regulation should consider CO₂ monitoring data
and ventilation effect at the same time. We suggests that employer should check and improve the
ventilation devices when the concentration of CO₂ exceed 1,000 ppm. Employers can also assess the
working environment through CO₂ measurement concentration periodically.