The paper presents results of the calculation of adsorption of volatile organic compounds (VOCs) on activated carbons. A simplified local-density model was combined with the Peng-Robinson equation of state and quadratic mixing rules to model adsorption of the most popular VOCs from air. The model was fitted to the adsorption data for pure components of the system over wide pressure range at one temperature. Only one temperature-independent empirical model parameter for each binary system (VOC-activated carbon) was used. The effects of temperature, pressure and adsorbent structure on the adsorption behaviour were studied.