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A dust is formed in the during of vital functions in towns and suburbs. Also dust is formed in the during of technology and industrial operations on the AIC enterprises and other enterprises. A dust is hazardous factor of worker's zone microclimate. A dust have is various composition, size and extraction. This dust is negative affect on people’s health and animals’ health, also electrical and electromechanical hardware have is negative effect too. The quality of products decrease. The environment, living and industrial premises are suffering from the dust. A dust penetrates through ventilation system from windows and doors and goes to the peoples’ clothes and boots. In the course of employment, the dust can hit to respiratory, visual organs and humans’ skin. That's why monitoring of dust in the environment and dust control is serious hygienic, social and economic task. To evaluate state of the environment have been measured of a dust concentration in the classes of Engineering-Technical institute of State Agricultural University of North Ural in the during of lessons. Students spend the significant part of their time on the lessons, therefore environment quality and concentration of dust is affect to students’ health. The researched class is located near with the big car interchange road, also near is located agricultural grounds and rail-roads. But measures have not identified excess of dust concentration. Keywords: DUST, VENTILATION, CLASSES, MONITORING OF THE STATE OF THE AIR ENVIRONMENT

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