The vaccine development and production will be the key to slow down the epidemic. However, vaccines are injected directly into humans. To maintain the good quality of vaccines, the quality control of biotechnology vaccine production system is more becoming critical. Therefore, this study will conduct the field measurement of air-conditioning systems of a biotech vaccine factory in Taiwan. The results show that the number of particles under at-rest occupancy was affected by the air change rate. Besides, the higher the recovery rate becomes, the better the pollutant removal capacity obtains. Therefore, it may also lead to more energy consumption of the air conditioning system. However, no matter in any air-conditioning system, regular field measurements should be made to ensure the effectiveness of air conditioning systems. In addition, building management system should be established to ensure the long term environmental control demands specific for biomedical facilities.