Plant leaves, as natural receptors of airborne particles, can retain particles onto their surfaces, and absorb gaseous pollutants, thus mitigating air pollution and improving air quality. Dry deposition is considered the main process for particle removal from the atmosphere, and its velocity (V_d) is a crucial parameter for describing the process. Wind tunnels, a conventional approach to determine V_d, are costly and require substantial space, and regular inspections to maintain their systematic integrity. Hence, this study established a simpler and more straightforward method based on relevant research to obtain the submicron particulate matter (aerodynamic diameter ≤1 μm; PM₁) V_d on plant leaves. This method involves determining the attenuation pattern of particle concentration in a smog chamber. The V_d values of six tree species (three broadleaved and three coniferous) were obtained through the indirect method. In addition, we determined the V_d of the same tree species with a wind tunnel and compared the values from both methods. Through the paired-samples t-test, it's found that there is no significant difference (sig. = 0.59) between these two methods, which means that the indirect method is feasible to determine V_d. We also compared our results with those from other researches, and we found that the V_d values in our study might be lower because leaves and shoots were used in this research, while branches or seedings were selected in the literature. Overall, when applying such values to predictive models or in concrete studies, researchers must consider factors such as real-time meteorological conditions (humidity, temperature, etc.) and pollutant concentration. The indirect method requires less space and is less costly than the wind tunnel method; therefore, it can easily be used to conduct experiments under controlled conditions, which is helpful for simulating various scenarios.

植物叶子作为空气中颗粒的天然受体，可以将颗粒保留在其表面，并吸收气态污染物，从而减轻空气污染并改善空气质量。干沉积被认为是从大气中去除颗粒的主要过程，其速度 ( V _d ) 是描述该过程的关键参数。风洞是确定V _d的传统方法，成本高且需要大量空间，并需要定期检查以保持其系统完整性。因此，本研究在相关研究的基础上建立了一种更简单、更直接的方法来获得亚微米颗粒物（空气动力学直径≤1 μm；PM ₁）V _d在植物叶子上。该方法涉及确定烟雾室中粒子浓度的衰减模式。通过间接方法获得了六种树种（三种阔叶树和三种针叶树）的V _d值。此外，我们通过风洞确定了相同树种的V _d并比较了两种方法的值。通过配对样本t检验，发现这两种方法之间没有显着差异（sig. = 0.59），这意味着间接法确定V _d是可行的。我们还将我们的结果与其他研究的结果进行了比较，我们发现V _d我们研究中的值可能较低，因为在本研究中使用了叶子和芽，而在文献中选择了枝条或种子。总体而言，将这些值应用于预测模型或具体研究时，研究人员必须考虑实时气象条件（湿度、温度等）和污染物浓度等因素。间接法比风洞法占用空间小，成本低；因此，它可以很容易地用于在受控条件下进行实验，这有助于模拟各种场景。