Within the scope of the project, it is aimed to detect aerosols with a diameter of 0.3-5 microns in the ambient air in the studies carried out in the field of CBRN with an optical-based system. The particles in the ambient air, which will be transferred to the system in the device to be developed through pumps, are measured by laser stimulation. If the size of the threat particles in the air is within the expected range, the amount exceeds a certain threshold value and the value of the size distribution fluorescence ratios, the device will be alarmed and it will be understood whether the detected particles are biological or not. The product that will emerge at the end of the project can be integrated into all kinds of land-air-sea platforms that can be used manned and unmanned, and can be integrated and communicated with CBRN systems on these platforms, thus enabling remote and early detection of biological threats (bio-attack, terrorism, virus, etc.) in civilian and military areas.