ANALYSIS OF THE VERTICAL AND HORIZONTAL CHARACTERISTICS OF THE PM PROFILE IN A MAJOR ROADWAY, IN ATHENS, GREECE

摘要

A carefully designed monitoring study based on the PM10, PM2.5 and PM1 monitoring was carried out at an urban roadside environment of Athens, Greece. With the principal aim to give insight to the horizontal and vertical characteristics of the traffic induced PM status, the experimental equipment was placed simultaneously on different heights of a 19m high building, both along the main road and the street canyon. The collected samples were chemically analyzed in terms of its carbonaceous and ionic content.According to the data analysis, the vertical configured status was more complicated than the horizontal one probably due to the enhanced role of the atmospheric chemistry increasing the distance form the ground sources.The maximum concentrations of the particles occurred along the main road indicating undiluted concentrations drawn directly from the roadway. In the adjacent of the main road, the PM values were decreased increasing the height whereas within the canyon was obtained the opposite trend, probably due to a mixing action.The traffic related OC, EC, NO_3~- and SO_4~(2-) species were the dominant PM constituents. Ingeneral, the carbonaceous input was more sensitive to the changes, especially for the horizontal axis. As for the ionic mass, its behavior was more complicated due to its simultaneous secondary identity.