We investigated quantitative and qualitative representation of the germs of filamentous micromycetes in the samples of plant origin which were taken in connection with objective and subjective changes of health state of employees' respiratory tract from various factories. On the basis of the received results it is required to deal with questions on the determination of certain acceptable amount of micromycetes in the environment, and the like. It is necessary to objectivize the degree of risk in workers at the professional exposition of micromycetes or their toxins.