The present invention is a computer modeling system for creating a comprehensive environmental impact model. The system performs a series of novel functions to reflect the impact of multiple emissions on all species of interest within an environment at designated concentration levels. The system can be further utilized as a repository to update environmental data received from scientific researchers and to update existing models accordingly. The system integrates new data and updates calculations to create increasingly complex, comprehensive and reliable predictive models for users, which include US and foreign entities charged with developing emissions standards.