Stratigou Evdokia, Dusanter Sébastien, Brito Joel, Tison Emmanuel, Riffault Véronique
Centre for Energy and Environment, IMT Nord Europe, University of Lille, Institut Mines-Télécom, F-59000 Lille, France.
Toxics. 2022 Mar 29;10(4):161. doi: 10.3390/toxics10040161.
The indoor environment is usually more polluted than outdoors due to emissions of gas and particle-phase pollutants from multiple sources, leading to their accumulation on top of the infiltration of outdoor pollution. While it is widely recognized that negative health effects arise from the exposure to outdoor air pollution, exposure to indoor pollutants also needs to be well assessed since we spend most of our time (~90%) breathing indoors. Indoor concentrations of pollutants are driven by physicochemical processes and chemical transformations taking place indoors, acting as sources and/or sinks. While these basic concepts are understood, assessing the contribution of each process is still challenging. In this study, we deployed online instrumentation in an unoccupied room to test a methodology for the apportionment of indoor and outdoor pollutant sources. This method was successfully applied to the apportionment of PM and VOCs, however, there are limitations for reactive gases such as O. The results showed that this unoccupied indoor environment acts as a source of VOCs and contributes 87% on OVOCs and 6% on CH, while it acts as a sink for particles, likely due to losses through volatilization up to 60%.
由于多种来源排放气体和颗粒相污染物，室内环境通常比室外污染更严重，导致它们在室外污染渗入的基础上进一步积累。虽然人们普遍认识到接触室外空气污染会对健康产生负面影响，但由于我们大部分时间（约90%）都在室内呼吸，因此也需要对接触室内污染物的情况进行充分评估。室内污染物浓度受室内发生的物理化学过程和化学转化驱动，这些过程充当源和/或汇。虽然这些基本概念已为人所知，但评估每个过程的贡献仍然具有挑战性。在本研究中，我们在一个无人居住的房间里部署了在线仪器，以测试一种室内和室外污染物源分配方法。该方法成功应用于颗粒物和挥发性有机化合物的分配，然而，对于诸如臭氧等活性气体存在局限性。结果表明，这个无人居住的室内环境是挥发性有机化合物的一个源，对含氧挥发性有机化合物的贡献率为87%，对甲烷的贡献率为6%，而它是颗粒物的一个汇，这可能是由于挥发损失高达60%。
