The aim of this thesis was to examine the impact of noise and microclimatic factors on voice quality of a group of twelve female cook workers in the student fast food restaurant in Zagreb. Accordingly, acoustic characteristics of their voices at the beginning and at the end of a working day were examined and compared. The examination was carried out for both working shifts – the morning one, as well as the afternoon one. Acoustic characteristics of their voices were examined using acoustic analysis as an objective method. Prolonged phonation of the /a/ vowel and a short spontaneous speech were acoustically analyzed using Praat Program. Participants also fulfilled Voice handicap index-10. Observed acoustic parameters were fundamental frequency obtained from phonation, fundamental frequency obtained from spontaneous speech (counting), jitter, shimmer, and harmonic-to-noise ratio (HNR). Although there were some changes among almost all the acoustic parameters, which were showed through individual analysis of each participants' voice, statistical analysis of acoustic measurements showed no significant changes in the observed parameters at the end of the working day. Analysis of the answers of the Voice handicap index-10 showed that almost all participants sometimes exhibit vocal problems or experience uncomfortable situations related to their voice and/or communication. Also, statistical analysis showed some significant correlations between some of the VHI-10 variables, smoking and allergies.