The composition of chemical mixtures in the work environment depends mostly on the temperature of the air or the
processing temperature of the raw material or the intermediate products. To determine the chemicals in the air FTIR/FTNIR
spectrometer Interspec 301-X with open optical path and Dräger tubes were used. The toxicology of the gaseous
components was determined on the basis of the scientific literature. Resulting from these investigations and the
legislation on the chemicals safety (exposure limits) the health risk assessment model (HRA) was worked out. This
model connects the hazards in the work environment and the health risk to the workers and enables the possibility to the
medical personnel to determine the frequency of the medical examinations and biomonitoring for the workers
continuously working in the hazardous conditions. The novelty of the study lies in the possibility to keep the chemicals
concentration in the work environment air under control through the use of the HRA model and the measurement with
modern measurement equipment (FTIR/FT-NIR).
Keywords: indoor air, risk assessment chemicals in the air.