The study explores the usage of Diesel Fuel (DF) blends in conjunction with two biofuels, eucalyptus and turpentine oil, in diesel engines to address the reduction of air pollutants such as Carbon Monoxide (CO), Nitrogen Oxides (NOX), Unburned Hydrocarbons (UBHC), and smoke density. Results indicate that while the use of Eucalyptus Oil Fuel (EOF 40) marginally increases brake-specific energy consumption by 1.03%, Turpentine Oil Fuel (TOF 40) decrease it by 3.05% compared to conventional DF. Furthermore, the Brake Thermal Efficiency (BTE) of TOF 40 blend surpasses that of EOF 40 blends by 4.91%. The analysis of Heat Release Rate (HRR) indicates a higher trend for higher proportions of EOF blend compared to TOF and base DF. TOF blends have lesser atmospheric pollution as compared to EOF blends. Notably, the employment of TOF 40 blend results in a reduction of atmospheric pollutants such as Smoke Density, NOX, CO and UBHC were 12.98%, 17.83%, 25.6% and 15.51%, respectively, in comparison with DF.