[Pattern of suspended particles in the air of an urban zone]

Measurements of suspended particulates have been carried out throughout one year in a fixed station located in a street with medium-high traffic intensity, in a urban area of Rome. Determinations have been made by gravimetric method on samples obtained by filtration through micropores membrane filters. Monthly patterns and weekly and daily patterns of particulates in summer and winter in the monitored area are reported, as well as the frequency distribution in average daily concentration classes over a period of one year.