The structure of pure substances. Properties and behavior of gases, solid and liquid substances. Dispersed systems. Solutions. Phase equilibrium, Gibbs' phase rule, two and three component systems. Sorption processes in remediation of the working environment. Physical and chemical adsorption, heat of adsorption, adsorption equilibrium and kinetics. Application of the adsorption process in occupational engineering. The impact of catalysed processes on the working environment. Catalysis, catalytic reactions, the theory of heterogeneous catalysis, homogeneous catalysis. Experiment in controlling the quality of the working environment. Approach to experimental research, planning of experiment. Types of errors. Systematic errors. Random errors. Rough experimental errors. The accuracy and precision of the experimental results. Processing of the experimental results. Graphical analysis of the experimental results. Statistical analysis of the experimental results. Analytical methods. Chemical, sensory, biochemical and instrumental analytical methods. Spectroscopy. Theoretical basis and types of spectroscopy. Spectroscopic methods in controlling the quality of the working environment. Instruments in optical spectroscopy. Theoretical basis of separation methods. Chromatographic analytical methods in controlling the quality of the working environment.