In order to study the magnitude of air pollution by different size distributions of aerosol particles, we selected a
site in the city of Algiers in Algeria as presented in the European classification that is directly influenced by
emissions from road traffic [9]. Such site allows access to maximum levels of pollution that an urban population can
be exposed. The selected site where measures were carried out was located at the National Polytechnic School, 10
km in the east of Algiers. The sampling station was located at an altitude of 4m and 9m from the edge of the NR n°5
(National Road). In 2000, the major highway had a volume of 25,000 vehicles per day with approximately 15% of
them buses and heavy diesel vehicles [10]. The case study site was characterized by the absence of obstacles and
good natural ventilation. In addition, there were no industries nearby which could emitting particles and thus
interfere with assessment of the effect of air pollution due to road traffic.