This study was conducted to help manage total floating bacteria and fungi in the indoor air by studying the characteristics of total floating bacteria and fungi according to the indoor CO2 concentration of daycare centers. The sampling and analysis of samples was based on the indoor air quality process test method, and the result analysis was conducted using the SPSS statistical program to perform correlation and regression analysis. Correlation and regression results show that CO2 and total airborne bacteria showed positive relationships, but airborne mold did not show relevance. In addition, in order to identify factors affecting airborne mold, correlation analysis and regression analysis were performed regarding total airborne bacteria, PM10, PM2.5, HCHO, outdoor mold, I/O ratio, indoor temperature/ humidity, area per classroom and volume. The results showed that the factors affecting airborne mold were I/O ratio, outdoor airborne mold, and total airborne bacteria. Research results show that CO2 and total airborne bacteria can be reduced and controlled by natural ventilation, and in the case of airborne mold, mechanical forced ventilation such as hoods will be necessary due to the introduction of outdoor airborne mold. In addition, it is necessary to consider I/O ratio criteria in order to confirm effective indoor mold contamination, taking into account the effect of outdoor mold inflow.

Abstract
1. 서 론
2. 실험방법
    2.1 연구대상 및 시기
    2.2 시료채취 및 분석방법
3. 결과 및 고찰
    3.1 이산화탄소와 총부유세균, 곰팡이 통계분석
    3.2 곰팡이와 환경인자 통계분석
    3.3 I/O ratio를 적용한 곰팡이 기준 관계
4. 결 론
References

• 손해준(경기도 보건환경연구원 북부지원 대기환경팀) | Hae-Jun Son (Atmospheric environment team in North Branch) Corresponding Author
• 이강혁(경기도 보건환경연구원 북부지원 대기환경팀) | Kang-Hyuk Lee (Atmospheric environment team in North Branch)
• 정연훈(경기도 보건환경연구원 북부지원 대기환경팀) | Yeon-Hoon Jung (Atmospheric environment team in North Branch)
• 김진길(경기도 보건환경연구원 북부지원 대기환경팀) | Jin-Guil Kim (Atmospheric environment team in North Branch)
• 임윤정(경기도 보건환경연구원 북부지원 대기환경팀) | Yoon-Jung Lim (Atmospheric environment team in North Branch)
• 유한조(경기도 보건환경연구원 북부지원 대기환경팀) | Han-Jo You (Atmospheric environment team in North Branch)
• 최인태(경기도 보건환경연구원 북부지원 대기환경팀) | In-Tae Choi (Atmospheric environment team in North Branch)
• 윤수현(경기도 보건환경연구원 북부지원 대기환경팀) | Su-Hyun Yoon (Atmospheric environment team in North Branch)
• 최형주(경기도 보건환경연구원 북부지원 대기환경팀) | Hyung-Joo Choi (Atmospheric environment team in North Branch)
• 김종수(경기도 보건환경연구원 북부지원 대기환경팀) | Jong-Soo Kim (Atmospheric environment team in North Branch)