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In the past few decades studies of rock magnetism can be used to various problems, such as the study of magnetism for detecting pollution in agriculture soil, as well as rivers and lakes sediments. In this study, rock magnetic methods were used to study magnetic properties of bus bottom ash. This research was conducted with the aim of developing new methods to determine the level of exhaust emissions of bus and others. Sampling was carried out by scrapping the exhaust tube of the bus on two different types of buses, i.e. 35 samples on public buses and 14 samples on tourism buses. Samples were tested to determine the elements with XRF and magnetic susceptibility test using Bartington MS2B. The measurement results shows that the elemental content found in bottom ash samples, among others, Fe 18.6 - 72.01%, Mo 10-47%, S 7-24.5%, Ca 0.53-24.7%, P 0 , 9-2.9%, Zn 0.38-2.99%, Ni 0.07-0.28%, Cu 0.17-0.4%, Mn 0.09-0.5%, Cr 0.1 -0.5%, Ti 0.16 -1,1%, Re 0.2-0.3%, 0.06-0.6%. The value of low frequency magnetic susceptibility (χlf) the public bus samples have a range (4.00 - 343.77) x 10−8 m3/kg with an average of 46.31 x 10−8 m3/kg with an average of χfd of 3.45%. The tourism bus emission samples has a range between (5.19 - 146.37) × 10−8 m3/kg with an average of 51,880 x10-8 m3/kg with an average χfd of 3.68%. The types of magnetic minerals found on public and tourism buses imply ferrimagnetic minerals with superparamagnetic (SP) and stable single domain (SSD).