High concentrations of PM2.5 were generated in new apartments before moving in, and PM2.5 reduction efficiencies using air cleaners and ventilation systems were evaluated. The experimental results for different air cleaner capacities showed that the PM2.5 reduction efficiencies for 46.2 m2, 66 m2, and 105.6 m2 areas were 81.7%, 92.9%, and 92.5%, respectively. Thus, the larger the air cleaning application area, the higher the PM2.5 reduction efficiency. However, there was no difference in the efficiency of overcapacity air cleaners above a certain capacity. The efficiencies of air cleaners located at the living room center, interior wall, and edge were 81.7%, 79.2%, and 75.8%, respectively. There was, therefore, no significant difference in the PM2.5 reduction efficiencies of air cleaners in different locations. Furthermore, the PM2.5 reduction efficiencies at distances of 1 m, 2 m, and 3 m were 81.7%, 81.3%, and 81.7%, respectively. Therefore, there was also no significant difference in efficiency with distance. The PM2.5 concentration decreases rapidly during natural ventilation. Therefore, when the indoor PM2.5 is higher than the outdoor PM2.5, the air cleaner should be used after natural ventilation. The efficiency of PM2.5 reduction using an air supply-type ventilation system in apartments was 35%, which is not high. The simultaneous operation of the ventilation system and kitchen range hood was effective, showing a PM2.5 reduction efficiency of 69.1%. However, a water sprayer was not effective, showing a PM2.5 reduction efficiency of 24.3%. The results of this study suggest that PM2.5 reduction performance should be standardized by evaluating the efficiency of different ventilation systems. Effective usage and maintenance standards for ventilation systems need to be disseminated, and ventilation systems and air cleaners should be used effectively.

Abstract
1. 서 론
2. 연구방법
    2.1 측정대상시설
    2.2 공기청정기
    2.3 초미세먼지(PM2.5) 측정 방법
3. 결과 및 고찰
    3.1 공기청정기 적용면적별 효율
    3.2 공기청정기 위치별 효율
    3.3 공기청정기 거리별 효율
    3.4 자연환기와 공기청정기 효율 비교
    3.5 환기장치와 공기청정기 효율 비교
    3.6 물분무기와 공기청정기 효율 비교
4. 결 론
References

• 심규승(경기도보건환경연구원) | Kyuseung Shim (Gyeonggi-do Institute of Health & Environment) Corresponding author
• 배용수(경기도보건환경연구원) | Yongsu Bae (Gyeonggi-do Institute of Health & Environment)
• 이강혁(경기도보건환경연구원) | Kanghyuck Lee (Gyeonggi-do Institute of Health & Environment)
• 김종보(경기도보건환경연구원) | Jongbo Kim (Gyeonggi-do Institute of Health & Environment)
• 백민경(경기도보건환경연구원) | Minkyung Baek (Gyeonggi-do Institute of Health & Environment)
• 장은아(경기도보건환경연구원) | Eunah Jang (Gyeonggi-do Institute of Health & Environment)
• 이효진(경기도보건환경연구원) | Hyojin Lee (Gyeonggi-do Institute of Health & Environment)
• 조진경(경기도보건환경연구원) | Jinkyung Jo (Gyeonggi-do Institute of Health & Environment)
• 박종민(경기도보건환경연구원) | Jongmin Park (Gyeonggi-do Institute of Health & Environment)
• 박종완(경기도보건환경연구원) | Jongwan Park (Gyeonggi-do Institute of Health & Environment)