Among the environmental pollution elements, one of the most important problems of the world today, air pollution and heavy metal pollution that have gradually increased after the industrial activities, are of significant importance. Heavy metals are not easily dissolved in nature. Moreover, they tend to bioaccumulate in living organisms, and some of them have a toxic or carcinogenic effect even at low concentrations. For this reason, it is crucial to monitor the heavy metal concentration in the air and monitor the changes. One of the efficient methods in observing the change of heavy metal concentrations in the air is the use of annual rings of trees as a biomonitor. The present study aimed to determine the annual change of Ni and Co concentrations, which are among the heavy metals related to traffic volume at most, in annual rings of Cedrus atlantica harvested in Kastamonu in late 2019. Within the scope of this study, the heavy metal concentrations in the inner and outer bark were compared to the heavy metal concentration in wood and the change of concentration in terms of direction was also analyzed. As a result of the present study, the highest concentrations in both heavy metals were found in the outer bark, whereas the transmission of metals within the wood was limited. It was found that Ni concentration significantly changed directionally in woods, and this change was related to the traffic volume. Thus, it was concluded that the annual rings of Cedrus atlantica were very suitable biomonitors to monitor Ni concentration change.

在环境污染要素中，当今世界上最重要的问题之一，在工业活动后逐渐增加的空气污染和重金属污染具有重要意义。重金属不易溶于大自然。而且，它们倾向于在生物体内生物蓄积，其中一些甚至在低浓度下也具有毒性或致癌作用。因此，至关重要的是监测空气中的重金属浓度并监测变化。观察空气中重金属浓度变化的一种有效方法是使用树木的年轮作为生物监测器。本研究旨在确定Ni和Co浓度的年变化，这是与年交通量最大相关的重金属之一。2019年末在卡斯塔莫努（Kastamonu）收获的雪松（Cedrus atlantica）。在本研究范围内，将内树皮和外树皮中的重金属浓度与木材中的重金属浓度进行了比较，并分析了浓度在方向上的变化。作为本研究的结果，在外皮中发现了两种重金属中的最高浓度，而木材中金属的传播受到限制。结果发现，镍的浓度在森林中有明显的方向性变化，并且这种变化与交通量有关。因此，可以得出结论，雪松的年轮是非常适合监测镍浓度变化的生物监测器。