Smagowska B.

Ultrasonic noise at workplaces, in Poland is defined as the broadband noise containing high audible and low ultrasonic frequencies. Assessment of ultrasonic noise exposure is based on (equivalent and maximum) sound pressure level in the 1/3 oktave band (the central frequency are from 10kHz to 40kHz).The main sources of ultrasonic noise in the working environment are the so-called low frequency ultrasonic technological devices, including washers welders, ultrasonic drills, soldering tools and galvanizing pots. Ultrasonic noise is also generated by pneumatic tools and high-speed machinery such as planers, millers, grinders, circular saws and some textile machinery. This article presets a method of assessing ultrasonic noise at workplaces used in Poland and the results of assessing occupational exposure to ultrasonic noise at selected workplaces.