Plants play a fundamental role by intercepting air particulate matter (PM) and improving air quality. The link between the accumulation of pollutants and the leaf exposure time to air pollution remains unclear as it depends on different factors. The aim of this study is to test if the metal and PM accumulation in holm oak leaf is linked to exposure time to air pollution. For this study, 1- (1y) and 2-year (2y) old holm oak leaves were sampled in an urban area near Naples. Those leaves were analyzed to measure the amount of particulate matter (PM_2.5–10 and PM_>10) and the Cr, Cu, Mn, and Ni metal concentrations. The results displayed that leaf Cr, Cu, and Mn accumulation are linked to exposure time, whereas leaf PM deposit was not directly linked to the exposure time. PM deposit on leaves could be influenced by rainfall events or by the saturation of leaves’ surface.

植物通过拦截空气颗粒物（PM）和改善空气质量发挥着根本作用。污染物的积累与叶片暴露在空气中的时间之间的联系仍然不清楚，因为它取决于不同的因素。这项研究的目的是测试圣栎叶片中金属和PM的积累是否与暴露于空气污染的时间有关。在本研究中，在那不勒斯附近的市区采样了1-（1y）和2年（2y）的圣栎叶子。分析了这些叶子以测量颗粒物的量（PM _2.5-10和PM _{> 10}）以及Cr，Cu，Mn和Ni的金属浓度。结果表明，叶片中的Cr，Cu和Mn积累与暴露时间有关，而叶片PM沉积与暴露时间没有直接关系。叶片上的PM沉积物可能受降雨事件或叶片表面饱和度的影响。