Dust storms, which often occur in arid and semi-arid regions of the world, carry a large quantity of suspended particles and cause air pollution. Plants have a great potential to be employed as biomonitor for assessing air pollution because they are easy to sample and also they are present in almost all the environments. Due to its location, the city of Jahrom in Fars province seems to be vulnerable in terms of atmospheric dust. The objectives of this study were to evaluate the concentration of heavy metals and magnetic susceptibility in the leaves of bitter orange, to compare the results with those of dust particles deposited on palm leaves and adjacent surface soils, and to examine the temporal changes in the concentration of heavy metals in the leaves of orange tree in the city of Jahrom. The samples of orange tree leaves were randomly taken from 20 different sites in Jahrom city. Before the first sampling, half of the tree was washed and the remaining half remained intact. Samples were collected on a monthly basis from April to October 1395, from each part of the bitter orange. In the laboratory, the leaves of each part of the orange tree were randomly divided into two subsamples. One of the subsamples was completely washed with tap water followed by distilled water, and the second group remained intactThe concentration of all the elements was measured by atomic absorption spectrometry. This could be due to the accumulation of heavy metals bearing dust particles deposited on the surface of unwashed-unwashed leaves before and during the sampling period. The highest and lowest concentrations of heavy metals in plant samples were found for iron and cobalt, respectively, which corresponds to the concentration of metals in dust and soil saples. Since the concentration of heavy metals in unwashed-unwashed (UU) leaves was higher than that in other treatments, it can be concluded that the best treatment to evaluate the concentration of heavy metals in the city of Jahrom is unwashed-unwashed leaves. Concentrations of copper, manganese, lead and zinc in all the treatments of bitter orange leaves from April to October were almost the same increasing trend toward the end of sampling period. The source of these metals is most likely the human activities. However, iron concentration in UU and WU leaves increased until October and the highest concentrations was obtained in October and June. Based on the Duncan's comparison test, there was a significant difference at the 0.05 level in the leaves Fe concentration. In UW and WW leaves, the concentration of iron was highest in June and lowest in October. It is possible that iron has both natural and human origins. The concentration of nickel decreased with time in all the leaf treatments. The magnetic susceptibility in all the treatments of bitter orange leaves increased during the sampling period. Comparison of the concentration of heavy metals in dust and soil samples indicated that the concentration of copper, zinc and lead in dust was higher than that of soil. In contrast, the nickel concentration in the soil was higher than that of dust. Copper, lead, and zinc appear to mostly derive from human activities, while nickel seems to originate from natural sources. The magnetic susceptibility of dust samples was only slightly different from that of the soil samples. This might indicate that the origin of magnetic susceptibility in both dust and soil is the same. There was a significant correlation between magnetic susceptibility and zinc, manganese and iron concentrations. This is probably due to the common origin of these heavy metals and magnetic minerals. Also, there was a significant correlation between iron, copper, manganese concentrations and also between iron, zinc and copper concentrations in bitter orange leaves. The two heavy metals groups appear to originate from two different sources. There was no correlation between heavy metals concentration in leaf of bitter orange and that in the dust deposited on date palm leaves. This might be due to the differences of leaf morphology of these two plants and their different ability to absorb dust. In general, due to low traffic density as well as the lack of industrialization, atmosphere in Jahrom city is less contaminated than Iranian big metropolitan areas such as Tehran, Isfahan, and Shiraz. Keyword s: Biomonitoring, atmospheric deposition, heavy metals, magnetic susceptibility, Jahrom city