In this work a chemical aerosol analysis online proton transfer time of flight massspectrometer (CHARON PTR-Tof-MS) is used to analyse submicron atmospheric particulate organic matter (POM). The measurements were held at the Innsbruck Atmospheric Observatory during the intensive observation period from 7th of March to 8th of April 2019 (IOP2019). The submicron POM is measured as organic trace compounds, chemically assigned and apportioned into source contribution factors. A total of 175 significant organic trace compounds between 42 m/z and 187 m/z are used for source apportionment analysis, applying positive matrix factorisation. A 10-factor solution was found to be the best representation of the data. The factors are assigned utilizing the contribution of likely and confirmed organic trace compounds and their fragments, compiled from the literature. Additional contributing factor unique organic trace compounds are interpreted and investigated on common fragmentation patterns. Factor weighted temporal variations, meteorological conditions and increased source activities are evaluated. The factors are apportioned to combustion (37 %), biomass burning (26 %), cooking (7 %) and two events of independent origin (21 %), leaving 9 % unidentified. The elemental analysis of the 175 distinct organic trace compounds allows for the calculation of the carbon oxidation state (OSC) and separates the factors in two carbon oxidation state classes. Primary organic aerosol (POA) contributes 40% and semi volatile organic aerosol (SV-OOA) 60% to the total measured organic aerosol mass concentration. The 175 analysed organic trace compounds of submicron POM have a bulk carbon oxidation state of (OSC)bulk = -0.76 classified as SV-OOA.