Ultrasonic noise at workstations in Poland is defined as the broadband noise containing high audible and Iow ultrasonic frequency components. The assessment ofultrasonic noise exposure is based on (equivalent and maximum) sound pressure level in the 113 octave bands (the central freąuencies arę 10, 12,5, 16, 20, 25, 31,5 and 40 kHz). The main sources ofultrasonic noise in the working environment arę the so-catted Iow freąuency ultrasonic technological devices, including washers welders, ultrasonic drills, soldering tools and galvanizingpots. In addition to those technological devices ultrasonic noise is also generated by pneumatic tools and high-speed machinery such asplaners, millers, grinders, circularsaws and some textile machinery. This article presents a method of assessing ultrasonic noise at workplaces and the results ofassessing occupational exposure to ultrasonic noise at selected workplaces in the textile factory.