2025-12-17 中国科学院（CAS）
＜関連情報＞
- https://english.cas.cn/newsroom/cas_media/202512/t20251218_1137831.shtml
- https://www.sciencedirect.com/science/article/abs/pii/S0360132325015677
間接喫煙による有機エアロゾルとガス状化合物の動的進化 Dynamic evolution of organic aerosols and gaseous compounds from thirdhand smoke
Liu Yang, Wei Zhou, Weiqi Xu, Siqi Zeng, Zijun Zhang, Bo You, Yan Li, Long Jia, Yi Zhang, Xi Chen, Yele Sun
Building and Environment Available online: 2 December 2025
DOI:https://doi.org/10.1016/j.buildenv.2025.114101
Graphical abstract
Highlights
- THS-derived organic aerosols show persistent concentrations with unique C3H8N+ and C2H4N+ fragment ions.
- THS emissions are primarily composed of organic compounds with 2–3 oxygen atoms.
- Prolonged smoke exposure increases THS retention on materials, reducing subsequent emissions.
Abstract
As secondhand smoke (SHS) regulations increase, thirdhand smoke (THS) has emerged as a significant, yet often overlooked source of indoor pollution. THS consists of tobacco smoke pollutants that cling to indoor surfaces and undergo complex re-emission and chemical transformations. This study utilized high-resolution aerosol mass spectrometry and chemical ionization mass spectrometry for real-time characterization of both THS organic aerosols (OA) and gaseous organic compounds in a typical indoor environment. Positive matrix factorization was used to analyze the dynamic evolution of THS composition and to identify its sources. Our findings reveal distinct differences between THS-derived and SHS-derived OA, particularly in nitrogen-containing marker ions like C5H10N⁺, C3H8N⁺ and C2H4N⁺. While SHS-OA decays over time, THS-OA maintains stable concentrations of ∼1–2 μg m-3. The gaseous organic compounds in THS primarily consist of low-oxygen CHO species, containing 2–3 oxygen atoms, with nitrogen-containing intermediate-volatility organic compounds (IVOCs) showing higher volatility. Notably, wool sweaters exposed to tobacco smoke showed deep penetration of tobacco molecules into the fibers, restricting the volatilization of VOCs. THS volatilization follows three phases: initial release of CHO-dominated compounds, followed by the release of nitrogen-containing VOCs, and then a prolonged emission of CH-dominated compounds. This study improves our understanding of the composition and volatilization processes of THS, emphasizing its long-term persistence and the potential health risks it poses in indoor environments.
