From the site -- "The National Environmental Public Health Tracking Network (Tracking Network) brings together health data and environment data from national, state, and city sources and provides supporting information to make the data easier to understand. The Tracking Network has data and information on environments and hazards, health effects, and population health. "
From the website -- "The National Response Center (NRC) is not a response agency. It serves as an emergency call center that fields INITIAL reports for pollution and railroad incidents and forwards that information to appropriate federal/state agencies for response. The spreadsheets posted to the NRC website contain INITIAL incident data that has not been validated or investigated by a federal/state response agency."
Online index of unpublished, non-confidential studies covering chemical testing results and adverse effects of chemicals on health and ecological systems.