The quantification of risk in urbanised environments at petrochemical sites, associated with atmospheric emissions of particulate matter from large industries, is essential for decision making and for directing the efforts of agencies in air quality management. It also provides useful information to identify the areas that need to be addressed most. Risk is defined as the probability that a hazard will cause harm by acting on a vulnerable population. For risk management, first the hazard must be identified, then it is necessary to assess the vulnerability of the population exposed to this hazard, and finally to estimate the level of risk from the integration of hazard and vulnerability. In this work, framed in the petrochemical pole of Ensenada, Gran La Plata, Argentina, it is proposed to evaluate the threat generated by the levels of environmental particulate matter associated with a coke calcination plant using the AERMOD modelling system. Then, using a Local Index of Social Vulnerability (ILVS) carried out for the region, the vulnerability of the population exposed to this hazard is evaluated, to finally obtain as a result the levels of risk from the integration of these two variables. In order for decisions to be successful, risk must be communicated among management actors through cartographic visualisation, as is done in this work.