The datasets related to the figures in the journal article and are derived from the two collocated Federal Equivalent Method (FEM) monitors that operated side-by-side in Sarajevo, Bosnia and Herzegovina for a 15-month timeframe. This dataset is associated with the following publication: Hagler, G., T. Hanley, B. Hassett-Sipple, R. Vanderpool, M. Smith, J. Wilbur, T. Wilbur, T. Oliver, D. Shand, V. Vidacek, C. Johnson, R. Allen, and C. D'Angelo. Evaluation of two collocated federal equivalent method PM2.5 instruments over a wide range of concentrations in Sarajevo, Bosnia and Herzegovina. Atmospheric Pollution Research. Turkish National Committee for Air Pollution Research and Control, Izmir, TURKEY, 13(4): 101374, (2022).