9 Environmental Assessment of Suspended Particulate Matter over the Kabul City, Afghanistan Esmatullah TORABI 1 and Atsushi NOGAMI 2 1 Master student, Faculty of Environmental Engineering, University of Kitakyushu (1-1, Hibikino, Wakamatsu-ku, Kitakyushu-shi 808-0135, Japan) Email: torabi_esmatullah@yahoo.com 2 Professor, Faculty of Environmental Engineering, University of Kitakyushu (1-1, Hibikino, Wakamatsu-ku, Kitakyushu-shi 808-0135, Japan) Email: nogami@kitakyu-u.ac.jp Atmospheric particulate has harmful effects on human health. Predicting dust and aerosol emission from transport would be helpful to reduce harmful effects but, despite numerous studies, prediction of dust events and contaminant transport in soil remains challenging. In this study, we focused on main roads as a major resource of air pollution. Hence, the objectives of this research are to reproduce the SPM concentration distribution, optimize the calculation conditions such as meteorological data and SPM emitting rate, and to predict the reduction of SPM concentration due to the progress of the paving of the main roads. The diurnal PM10 concentration was collected from NEPA monitoring station. By making wind rose diagram using Ms.Excel, we consider wind speed during 2015 FY. Furthermore, either meteorological and emission data are used as an input data for METI-LIS to predict air pollution condition. The average of daily total PM10 concentration from 2014 to 2015 is 275 μg/m 3 . Meanwhile, the higher mass concentration of PM10 is exceed 1000 μg/m 3 , indicating that meteorological parameters play a predominant role. If we compare this amount of concentration with national air quality standard (150 μg/m 3 ) then it will 6-7 times more than the standard amount. The meteorological factors, roads width, and their situation are strongly influenced the simulation results while to using the METI-LIS tool. Due to paving roads, air pollution is drastically reducing about 81 %. Key Words : atmospheric particulate, human health, SPM, NEPA, METI-LIS, PM10 concentration 1. INTRODUCTION PM is an air pollutant consisting of a mixture of solid and liquid particles suspended in the air. These suspended particles vary in size, composition, and origin. Particles are often classified by their aerodynamic properties because (a) these properties govern the transport and removal of particles from the air; (b) they also govern their deposition within the respiratory system, and (c) they are associated with the chemical composition and sources of particles. These properties are conveniently summarized by the aerodynamic diameter, which is the size of a unit-density sphere with the same aer- odynamic characteristics 11) . Atmosphere particulates or aerosols contain all liquid and solid particles, excluding pure water, that exist in the atmosphere under normal circumstances. Most of these are a result of direct emissions as par- ticles from the various natural and anthropogenic sources while others form from the condensation of certain gasses and vapors that are emitted into the atmosphere or are a result of chemical transfor- mations. Thus, like gaseous pollutants, atmosphere particulates can also be broadly classified as primary and secondary aerosols. A full description of them requires specification of their concentration, size distribution, chemical composition phase (liquid or solid), morphology, and biological activity. Several terms are commonly used in characterizing the par- ticulate- laden cloud masses 2) . PM has many sources and can be in either primary or secondary in origin and can be either a dry or wet state. It is produced naturally (e.g., pollen, spores, salt spray, and soil erosion) and by human activity (e.g., soot, fly ash, and cement dust) 10) . Primary PM is emitted directly and can be either coarse or fine, whereas secondary PM, which tends to be finer in size, is formed in the atmosphere through physical and chemical conversion of gaseous precursors such Japan Society of Civil Engineers, Proceedings of 44rd Annual Meeting of Environmental Systems Research 2016, ISSN 1345 9589 www.jsce.or.jp/ 第 44 回環境システム研究論文発表会講演集 2016 年 10 月