Surface dusts were collected from 14 different sites in five different function areas in Maha Sarakham
Municipality, Function areas were classified as commercial, parking lot, residential, park and traffic. The
sampling sites were marked on the map shown in Fig. 1, and the detail information of sampling was given
in Table 1. Sartor and Boyd (1972) investigated the distribution of sediment across the whole road surface
and found that 95% of the sediment load occurred within 1 m of the road adjacent to the edge of the road.
Therefore, in this study, the sample of surface dusts was collected by sweeping many areas of 1×1m2
surface adjacent to the edge of the road with a dustpan and brushes in each sampling site and stored in the
self sealed plastic bag during December 15-17, 2011 following a dry weather period of about 7 days.
Sample mass collected was between 200 and 350g for each sampling site. Soil samples were also sampled
in the place of less human interference to estimate the baseline conditions.