A comprehensive assessment of eastern regional haze is being undertaken by EPA's Environmental Monitoring Systems Laboratory. An Eastern Visibility Fine Particle Network (EVFPN) is being set up to study the relationships between fine particles and visibility. A long-term data base will be established to aid in determining spatial and temporal variations in indicators of visibility degradation in the Eastern United States. A further refinement of the visibility/particulate components relationships, with emphasis given to the nonsulfate components such as carbon and nitrate, will be developed. The monitoring strategy used to obtain optical properties, aerosol characteristics, and the characteristics of a scene will be discussed along with the general overview of the Eastern Visibility Fine Particle Network.