Dispersion Analysis of Ambient Coarse Particulate Matter

Abstract

This study uses numerical methods and HYSPLIT trajectory cluster analysis to evaluate the influence of wind speed and mixing height on the dispersive potential of PM₁₀. The analysis reveals a correlation of 0.58 and 0.44 between PM₁₀ concentrations and wind speed and mixing height, respectively. Wind speed and mixing height are decisive parameters in modulating PM₁₀ levels in ambient air. The study highlights that PM₁₀ concentrations decreased by 41.28% in February with wind speeds over 2 m/s and mixing heights below 400 m. Conversely, in April, PM₁₀ concentrations increase by 52.65% due to wind-induced resuspension with wind speeds over 2 m/s and mixing heights above 450 m. The findings of this study underscore wind speed as a crucial factor in reducing PM₁₀ levels during winter, provided the mixing height is sufficiently high, and in increasing PM₁₀ levels during summer due to resuspension effects.