This study investigates various blends of palm biodiesel and diesel fuel to evaluate the influence of biodiesel volume fraction on the smoke point and soot volume. The smoke point was measured in accordance with ASTM D1322, while the soot volume fraction was quantified using the light extinction method. The experimental results indicate that increasing the proportion of biodiesel in the blend results in a higher smoke point and a reduced soot volume. These findings suggest that the addition of biodiesel mitigates soot formation in the flame, thereby enhancing combustion efficiency and potentially lowering smoke emissions from diesel engines. Furthermore, a relationship was established between the palm biodiesel volume fraction and both the smoke point and soot volume, enabling interpolation for blends with varying biodiesel content. The outcomes of this research provide valuable data to inform engine studies, particularly those concerning combustion behavior and emission characteristics.