In this paper, we were examining the spectrum of laser plasmas in atmospheric air, helium gas target and helium jet while our objective was to determine interactions between laser plasmas and named targets. To do this we were focusing laser pulses on mentioned targets and observing interactions using LIBS spectrometer and method of time - resolved spectroscopy. A laser pulse of energy 63.2 mJ and repetition rate of 5 Hz was focused on the gas target in front of optical fiber that was connected to LIBS spectrometer and monochromator with the optical grating. LIBS spectrometer was used to analyze laser plasmas spectrum in helium and atmospheric gases. We were successful in determining laser plasmas spectrum and identifying atoms and ions inside the plasma. Furthermore, we were focusing laser pulses on atmospheric pressure helium plasma jet, and monitoring interactions using photomultiplier whose signal was recorded in time on the computer. In addition to this, spectral line profile of helium line 388.86 nm was observed in different time delays. By determining the width of line it was possible to calculate excitation temperature of electrons within laser plasmas. By knowing excitation temperature of electrons and Stark width we successfully calculated concentrations of electrons within laser plasmas. In our results, we showed that the presence of the jet didn’t have a significant effect on excitation temperature of electrons or their concentration within laser plasma, however it does effect the helium emission spectrum by reducing the intensity of helium 388.86 nm line in the presence of helium jet.