Air quality monitoring can be done in many ways such as physico-chemical methods by using equipments to measure concentration of the pollutants and biological method by using organisms as bioindicators. Physico-chemical method has an advantage that it can determine the concentration and types of pollutants but cannot determine the effects or accumulation of pollution to the organisms and environment. Furthermore, it is rather expensive and the instruments used is often sophisticated. Biomonitoring is method to measure the response of organisms to air pollution. Application of biomonitors has several advantages. It provides integrated exposure over a certain period of time. It also can be applied in remote areas and in expensive technical equipments are involved (Sloof et al., 1988; Steinnes, 1989 cited by Sloof, 1995). Biological method using bioindicators may be done by observing changes in physiological structures, biochemistry and chemical compounds of the organisms, or by evaluating from the diversity of organisms, such as, appearing or disappearing of some certain species. This method can monitor the effects of pollutions to organisms directly without using complicated expensive equipments (Subsri, 2001). However, it cannot measure the concentration of pollutants which is the disadvantage of this method. Therefore, it is recommended that both physico-chemical and biological method should be done together to obtain complete information. One of the physico-chemical monitoring methods used for air pollution monitoring is the passive sampling technique. This method is easy and the sampling tubes can be set up in all study areas without transporting of sophisticated instruments.