Community centers are representative public-use facilities where occupants may spend extended periods indoors. However, information on indoor air quality (IAQ) variability under different operational conditions remains limited. This study investigated IAQ characteristics in 11 community centers in Jeollanam-do, Republic of Korea, using continuous monitoring from May to July 2025. Concentrations of PM2.5, PM10, radon, volatile organic compounds (VOCs), and CO2 were measured together with temperature and relative humidity. Mean concentrations were 9.4 ± 4.9 μg/m3 for PM2.5, 18.7 ± 8.6 μg/m3 for PM10, 66.5 ± 53.9 Bq/m3 for radon, 281.1 ± 240.5 ppb for VOCs, and 600.0 ± 199.9 ppm for CO2. Radon and VOCs showed substantial inter-facility variability, with radon concentrations ranging from 14.2 to 140.7 Bq/m3. PM2.5, PM10, and radon were highest during the Occupied-AM condition, whereas VOCs and CO2 peaked during the Occupied-Late and Occupied-PM conditions, respectively. Weekend concentrations of radon and VOCs were significantly higher than weekday levels, while CO2 concentrations were significantly higher on weekdays (all p < 0.01). Although some differences were observed according to building characteristics, variability among facilities remained greater than differences among building characteristic groups. These findings indicate that IAQ in community centers is strongly influenced by operational conditions and exhibits considerable temporal and spatial variability. Effective IAQ management should therefore consider operational conditions and facility-specific characteristics in addition to conventional concentration-based standards. Unlike conventional assessments based primarily on average concentrations, this study demonstrates the value of continuous monitoring for identifying temporal variability associated with actual operational conditions in public-use facilities.

Abstract
1. 서 론
2. 연구 방법
    2.1 연구대상 및 측정기간
    2.2 측정 장비 및 데이터 처리
    2.3 통계분석
3. 연구 결과
    3.1 실내공기질 분포 특성
    3.2 운영조건에 따른 실내공기질 변동 특성
    3.3 주중·주말 실내공기질 비교
    3.4 건축특성에 따른 실내공기질 특성
4. 고 찰
    4.1 주민센터 실내공기질 특성
    4.2 운영조건과 실내공기질 변동
    4.3 시설 간 변동성과 건축특성
    4.4 연구의 시사점 및 제한점
5. 결 론
감사의 글
References
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• 최수진(기후에너지환경부 낙동강유역환경청 대기환경관리단) | Su-jin Choi (Air Environment Management Division, Nakdong River Basin Environment Office, Ministry of Climate, Energy and Environment)
• 전형진((주)에어테르) | Hyung-jin Jeon (Airther Inc KR)
• 서성철(서경대학교 환경화학공학과) | SungChul Seo (Major of Environmental & Chemical Engineering, School of Future Convergence 2, Seokyeong University) Corresponding author
• 이소영(기후에너지환경부 낙동강유역환경청 측정분석과) | So-young Lee (Monitoring and Analysis Division, Nakdong River Basin Environment Office, Ministry of Climate, Energy and Environment)
• 고민정(기후에너지환경부 낙동강유역환경청 측정분석과) | Min-jeong Go (Monitoring and Analysis Division, Nakdong River Basin Environment Office, Ministry of Climate, Energy and Environment)
• 장정희(기후에너지환경부 낙동강유역환경청 측정분석과) | Jong-hee Jang (Monitoring and Analysis Division, Nakdong River Basin Environment Office, Ministry of Climate, Energy and Environment)
• 정준식(기후에너지환경부 낙동강유역환경청 측정분석과) | Joon-sig Jung (Monitoring and Analysis Division, Nakdong River Basin Environment Office, Ministry of Climate, Energy and Environment) Corresponding author