Using the case of Maha Sarakham municipality, the research aims to monitoring the impact of urban land use and
particle size distribution on the heavy metal (HM) contamination in surface dusts and carried out research into the
exposure and health risk assessment of heavy metals on the fine size dusts. Samples were collected from five function
areas. The contents of HM (lead, zinc, copper, and cadmium) in surface dusts were determined. Results showed only
Zn concentration tended to increase with decreasing particle sizes. Results revealed the highest zinc concentrations
from all areas. The parking lot samples contained the highest amount of heavy metals. HIs for all metals were lower
than their threshold values, indicating without health hazards. The study will be beneficial for the municipality in
terms of non-point source pollution control/management to promote the health of urbanites.