Urban forest is a term to represent the landscape and vegetation of a city and provide numerous benefits. One of the benefits is reducing city air pollution. Traffic-related pollutants are the most significant elements which contribute to the high airborne pollutant concentration. Various methods could be applied to alleviate the pollutant concentration in ambient air and one of the most efficient and environmentally method is by planting the vegetations in urban areas which are closely connected to the busy roads of a city. In fact, urban forest is the best particulate scavenger to reduce the level of air pollutant concentration to ameliorate the air quality of urban areas that will create a healthy living and pleasant community and natural ecosystem. This study attempts to view on the capabilities of urban forest in filtering the atmospheric environment by reducing the airborne particulates concentration. It provides an overview on the sources of the airborne pollutants, the consequences towards human health and living ecosystem and how to quantify the urban forests ability in reducing the concentration of particulate matter through various scientific methodological ways.