Abstract Carbon dioxide (CO 2 ) may have toxic effects at concentrations much lower than the concentration at which its stifling effect of asphyxiant is reflected. In the workplace, the maximum permissible exposure limit of 5000 ppm is permitted on the average. However, there are certain places where the concentration of CO 2 in an enclosed room or area may potentially reach extreme and life-threatening levels. Extreme levels of CO 2 may lead to death, especially in enclosed spaces, such as in fermentation rooms or in the process of wine production or in breweries. CO 2 may have negative effects on health and safety at the workplace. Monitoring and control of CO 2 in the working environment is important for the safety and health of employees and is one of the approaches to a healthier environment in the workplace. The use of CO 2 sensors to control the ventilation can be an effective measure.