This article is devoted to the implementation of the main features of the OpenGL graphical interface for constructing a network of dispersion of harmful substances emissions into the atmosphere by road-building equipment while developing the information system, highlighting the relevance and main advantages of the OpenGL library relative to other graphical interfaces. The article describes methods for calculating the parameters of dispersion of harmful substances in the ambient air, based on normative documents approved by the legislation of the Russian Federation. Sequentially outlines the basic steps of building a diffusion grid in the form of a 3D diagram using OpenGL. Such diagram is intended for the analysis and control of the state of the pollutants in the road construction zone and shows the areas and zones of safe influence of harmful substances that are most dangerous for the state of the environment. In the final part of the article, an example is given of constructing a grid of carbon monoxide (CO) scattering, as the main pollutant of the air basin by construction equipment.