It is worth noted here that, during May–September months of 2000, human activity was evident in the form of visible dust emanating from excavation construction of the new Athens ring road, about 2 km away from the experimental site. However, available wind records reveal that the predominant wind speeds serving as function of directions (SW-SSW-NE-ENE) point to the resultant aeration of the experimental site and consequently to the possible dust-aerosol concentration to be kept low. Another important contribution resulting in low aerosol levels is the local katabatic wind from the nearby Mt. Hymettus, transporting dust-aerosol loads away from the site.