A study on Measurement and Improvement of Indoor Air Quality in Dental Clinic

Abstract

The purpose of this study is to propose a management method to maintain the pleasant indoor air quality of the dental clinic by measuring and analyzing the indoor air quality of the dental clinic. The measurement was conducted in two rooms, a lobby where many residents stay in the reception room for waiting for medical treatment, and a VIP room where treatment activities are mainly performed. Measurement items are Temperature, Humidity, $CO_2$, CO, $NO_2$, $CH_2O$, VOC, $PM_{10}$ and measurement were taken on April 27, 2018. As a result of analyzing the temperature and humidity of the dental clinic, it was analyzed that the average indoor temperature was maintained at $25^{\circ}C$ and the humidity was kept at around 50%, maintaining proper indoor temperature and humidity environment. $CO_2$ was 855ppm in the VIP Room, which satisfied the maintenance standard. In the case of the lobby, it was analyzed to be 1,160ppm, which exceeded the maintenance standard and it is judged that the carbon dioxide generated by the respiration of the people staying in the lobby is the main reason. The mean concentration of formaldehyde in the VIP room was analyzed as $436{\mu}g/m^3$, exceeding the maintenance standard, and $2,100{\mu}g/m^3$ for the VOC exceeded the recommended standard. It was analyzed that the concentration was relatively higher due to the use of disinfectant and other drugs. The mean concentration of PM-10 in the lobby was analyzed as $65{\mu}g/m^3$ and it was analyzed that it satisfied the maintenance standard. To maintain a pleasant indoor air quality in a dental clinic it is necessary to minimize the effects of formaldehyde, VOC, $CO_2$ in the VIP rooms and lobby. For this purpose, the entire ventilation system and air purification system of the dental clinic should be installed. In case of the VIP room, local exhaust ventilation should be installed and workers should wear personal protective equipment.

Fig. 2. Concentration change of carbon dioxide with time(VIP Room)

Fig. 3. Concentration change of HCHO with time (VIP Room)

Fig. 4. Concentration change of VOC with time (VIP Room)

Fig. 5. Concentration change of carbon dioxide with time(Lobby)

Fig. 6. Concentration change of PM10 with time(Lobby)

Fig. 7. Concentration change of VOC & HCHO with time(VIP Room)

Fig. 1 Measuring Scene

Table 1. Measurement items

Table 2. Results of temperature and humidity measurement (VIP Room)

Table 3. Carbon dioxide measurement result(VIP Room)

Table 4. HCHO measurement result(VIP Room)

Table 5. VOC measurement result(VIP Room)

Table 6. Results of temperature and humidity measurement (Lobby)

Table 7. CO₂ measurement result(Lobby)

Table 8. PM10 measurement result(Lobby)

Table 9. Measurement result(VIP Room, Lobby)