Studying the indoor dynamics that impact particles is crucial in order to understand indoor air chemistry and assess overall human exposure to particles. This work investigates spatial gradients in particle concentration, caused by indoor transport and loss mechanisms. We conducted a variety of cooking experiments during the House Observations of Microbial and Environmental Chemistry (HOMEChem) campaign in June 2018 that allowed us to probe these mechanisms. We measured size-resolved (0.06–1 μm and 0.13–3 μm) particle number concentrations from cooking experiments using optical instruments at four locations throughout the house simultaneously. The particle number concentration in the kitchen was 40 ± 10% and 70 ± 10% higher than the concentrations in the living room and the bedroom, respectively. There was a minor size dependence, with larger differences in the smaller sizes of the accumulation mode (0.1–2.5 μm) than the larger end of the range. Dilution accounts for the majority of these concentration differences. Surface deposition was the dominant fate of particles within a zone, with observed deposition velocities ranging from 0.1 to 0.6 m h⁻¹.

中文翻译：

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HOMEChem 活动期间多区域室内环境中积累模式粒子的命运和空间变化

研究影响颗粒的室内动力学对于了解室内空气化学和评估人体暴露于颗粒的总体情况至关重要。这项工作研究了由室内传输和损失机制引起的粒子浓度的空间梯度。我们在 2018 年 6 月的众议院微生物和环境化学观察 (HOMEChem) 活动期间进行了各种烹饪实验，这使我们能够探索这些机制。我们使用光学仪器同时在整个房屋的四个位置测量了来自烹饪实验的尺寸分辨（0.06-1 μm 和 0.13-3 μm）粒子数浓度。厨房中的粒子数浓度分别比客厅和卧室中的浓度高 40±10% 和 70±10%。有轻微的尺寸依赖性，累积模式的较小尺寸（0.1-2.5 μm）比范围的较大端差异更大。稀释占这些浓度差异的大部分。表面沉积是区域内颗粒的主要归宿，观察到的沉积速度范围为 0.1 至 0.6 mh^-1。