The ability to take an adequate position in face of changes in its external environment is a fundamental condition for the organization surviving in the current world context, in which a high level of competitiveness and scarcity of resources are the rules. How effective are the organizational responses depends on the scope, timeliness, and quality of the information available. However, such attributes depend not only from the quality of the sources accessed but also from the availability of tools for information extraction in timeliness and with adequate presentation. Considering the Internet as one of the most comprehensive source of information currently available, it is proposed in this paper a functional model for environmental monitoring on the Web. The functions considered relevant to the model, according to the monitoring needs, are generally described. A prototype is presented and an example of application is described.