Department of Environmental Science, Policy, and Management, University of California, Berkeley, CA, USA.
Department of Chemistry, University of California, Berkeley, CA, USA.
Indoor Air. 2021 Jan;31(1):88-98. doi: 10.1111/ina.12731. Epub 2020 Oct 12.
Inhalation of particulate matter is associated with adverse health outcomes. The fluorescent portion of supermicron particulate matter has been used as a proxy for bioaerosols. The sources and emission rates of fluorescent particles in residential environments are not well-understood. Using an ultraviolet aerodynamic particle sizer (UVAPS), emissions of total and fluorescent supermicron particles from common human activities were investigated during the HOMEChem campaign, a test-house investigation of the chemistry of indoor environments. Human occupancy and activities, including cooking and mopping, were found to be considerable sources of indoor supermicron fluorescent particles, which enhanced the indoor particle concentrations by two orders of magnitude above baseline levels. The estimated total (fluorescent) mass emission rates for the activities tested were in the range of 4-30 (1-11) mg per person meal for cooking and 0.1-4.9 (0.05-4.7) mg/h for occupancy and mopping. Model calculations indicate that, once released, the dominant fate of coarse particles (2.5-10 micrometer in diameter) was deposition onto indoor surfaces, allowing for the possibility of subsequent resuspension and consequent exposures over durations much longer than the ventilation time scale. Indoor coarse particle deposition would also contribute to soiling of indoor surfaces.
吸入颗粒物与不良健康结果有关。超微米颗粒物的荧光部分已被用作生物气溶胶的替代品。住宅环境中超微米荧光颗粒物的来源和排放速率还没有得到很好的理解。在 HOMEChem 运动中，使用紫外线空气动力学粒子粒径仪 (UVAPS) 研究了常见人类活动产生的总荧光和超微米颗粒的排放。人类居住和活动，包括烹饪和拖地，被发现是室内超微米荧光粒子的重要来源，使室内粒子浓度比基线水平提高了两个数量级。测试活动的总（荧光）质量排放率范围为 4-30（1-11）mg/人餐烹饪和 0.1-4.9（0.05-4.7）mg/h 用于居住和拖地。模型计算表明，一旦释放，粗颗粒（直径 2.5-10 微米）的主要命运是沉积到室内表面上，从而有可能随后重新悬浮，并在比通风时间尺度长得多的时间内暴露。室内粗颗粒沉积也会导致室内表面污垢。
