Department: Thermal Physics, Acoustics and Environment, Building Research Institute (ITB), Filtrowa 1, 00-611, Warsaw, Poland.
Sci Rep. 2022 Feb 16;12(1):2580. doi: 10.1038/s41598-021-04487-y.
The aim of this study was to measure changes in asbestos dust concentrations over extended use in old building systems. Buildings from different systems during their service lifetimes and after asbestos removal were tested. Asbestos dust concentrations decreased in all building systems due to air exchange and other phenomena in the absence of new active dust sources. Currently, with proper use of those buildings, average values of dust concentrations did not exceed 300-400 f/m with a downward trend to < 300 f/m. The results of these studies were obtained with a modified optical microscopy technique, verified by SEM and TEM methods. The graphical trends in concentration changes over longer periods illustrate the potency of opposing factors reducing and increasing indoor air pollution. If removal asbestos work was not carried out carefully, single measurements conducted in the short-term and mandated immediately after asbestos removal may not detect hazards that appear over time. Monitoring buildings over longer periods allows detection of significant contamination changes. In many cases, the minimal air contamination undermines the desirability of removing asbestos in old buildings.
本研究旨在测量旧建筑系统中长时间使用石棉尘埃浓度的变化。对不同系统的建筑物在服役期间和拆除石棉后进行了测试。由于空气交换和其他现象的存在，所有建筑系统中的石棉尘埃浓度都有所下降，而没有新的活性尘埃源。目前，在适当使用这些建筑物的情况下，尘埃浓度的平均值没有超过 300-400 f/m，呈下降趋势至 < 300 f/m。这些研究的结果是通过改良的光学显微镜技术获得的，并通过 SEM 和 TEM 方法进行了验证。较长时间内浓度变化的图形趋势说明了减少和增加室内空气污染的对立因素的效力。如果拆除石棉工作没有得到谨慎处理，在短期内进行的单次测量以及在拆除石棉后立即进行的测量可能无法发现随着时间的推移而出现的危害。对建筑物进行较长时间的监测可以检测到显著的污染变化。在许多情况下，最低限度的空气污染破坏了在旧建筑物中去除石棉的可取性。
