The paper presents the assessment of fixed sources of atmospheric air pollution in the Balti urban ecosystem. These are analyzed depending on the field of activity, but also on a sectorial profile. Thus, it was established that in the Slobozia area, the most enterprises with transport activity, including on the railways, as well as production such as automotive, but also the biological waste water treatment plant LTD „Gloring Inginerng” with a volume of 241,9 t emissions. Another enterprise from EU Balti is JSC „Floarea Soarelui” with 604,3 t. An analysis of the ingredients in the emission structure is also made. Thus, CH and CO have a weight of 27% and 26% of the total, respectively.