Abstract. In this work, linear polypropylene (L-PP) and long-chain branched polypropylene miscible blend (LCB-PP), both having comparable weight average molecular weight (76 – 78 kg/mol), zero-shear viscosity (22.8 – 24.51 Pa·s at 230 °C) and polydispersity (4.41 – 4.50) were used to produce nonwovens via melt blown technology at constant temperature (270 °C) and two different die-to-collector distances (200 mm and 500 mm) in order to understand role of long chain branching on the fiber diameter distribution. Melt elasticity was evaluated via macroscopic relaxation time determined by shear viscosity data fitting by Cross and Carreau-Yasuda models and the longest relaxation time obtained by fitting small amplitude oscillatory shear data with a generalized Maxwell model. Extensional rheology was assessed by the strain rate dependent uniaxial extensional viscosity (estimated from the entrance pressure drop using the Gibson method) as well as through the infinite shear to zero-shear viscosity ratio, η∞/η0, (obtained directly from the measured experimental data), which is proportional to the maximum normalized extensional viscosity at very high extensional strain rates, ηE,∞/(3η0). Basic morphological characteristics of produced nonwoven samples have been determined using digital image analysis of SEM images considering three different magnifications to capture nanofibers as well as microfibers. Obtained results suggests, that utilization of low molecular weight and branched polymers can stabilize production of polymeric nanofibers and microfibers through melt blown technology considerably.