CDC's National Environmental Public Health Tracking Program is leading the initiative to build a nationwide network that obtains integrated health and environmental data. Using information from the Tracking Network, federal, state and local agencies will be better prepared to develop and evaluate effective public health actions to prevent or control chronic and acute disease that may be linked to environmental hazards ranging from air pollution to lead exposure. To support the users of this new tracking network, the CDC developed a course titled Environmental Public Health Tracking 101 and implemented it in August 2007. This modular course covers the basic principles of environmental public health tracking and provides an overview of the environmental public health tracking process for public health professionals. The CDC developed this course for online study, but individuals can use the course materials for live presentations if necessary. Moreover, public health professionals can receive continuing education credits (CE) for completing the course and its corresponding quiz. The Environmental Public Health Tracking 101 course is hosted on the National Environmental Health Association's Web site. The course is free, but participants must register. A fee is associated with CE's. For more information and to register, see Tracking 101 under NEHA-CERT Environmental Health Education Series* online programs.