An investigation of a method to control pollutant emissions from a propane diffusion flame by modifying the air infusion rate into it is presented. The modification was achieved by installing a set of Venturis around the burning gas jet(venluri-cascacling). Propane jet diffusion flames at three burner-exit Reynolds numbers (Re=3600, 5100 and 6500) corresponding to burner-rim-attached, in transition, and fully-lifted configurations were examined with several sets of Venturis of different sizes and spacing arrangements. Temperature and concentrations of CO2, O2, CO and NO in the exhaust products were measured with and without Venturis (baseline case). The largest effect of the venturi-cascade was observed at Re=5100. The lowest emissions of NO and CO were achieved with a venturi throat diameter/burner-exit diameter ratio (D/d) equal to 32±3. The influence of the size of Venturis was stronger than that of their spacing distribution. The flame structure measurements at those conditions showed that in the near-burner region of the venturi-cascaded flame the average values of temperature and CO2concentration were lower by 5% and 7% respectively than those in the baseline flame. However, in the mid-flame and far-burner regions of the venturi-cascaded flame the average temperature was higher by 13% and 12%, and the average CO2concentration was higher by 16% and 13%, respectively. In the near-burner, mid-flame, and far-burner regions, the venturi-cascaded flame had 16%, 5% and 3% lower average NO concentrations compared to the corresponding baseline flame. Laser Induced Fluorescence (LIF) measurements in the near-burner region of the venturi-cascaded flame indicated a decrease of 18%, 24% and 12% in the average concentrations of OH, CH and CN radicals, respectively, from their baseline values. However, in the mid-flame region, a 40% increase in OH from its baseline value was observed. In this region, CH and CN radicals were not detectable. The flow fields of the baseline and venturi-cascaded flames were numerically simulated using a computational fluid dynamics software package, and the role of Venturis in enhancing the influx of air was confirmed.