CDC's National Institute for Occupational Safety and Health (NIOSH) has released the Work-Related Lung Disease (WoRLD) Surveillance Report for 1999 (1). This report is the fifth in a series of WoRLD reports presenting summary tables and figures concerning various occupationally relevant respiratory diseases, including pneumoconioses, occupational asthma, other airway diseases, and other respiratory conditions. The report has three major sections: 1) summary highlights and limitations; 2) disease-specific tables and figures; and 3) appendices describing data sources, methods, and supplementary information. The WoRLD report presents national and state summary statistics such as counts, crude and age-adjusted mortality rates, and years of potential life lost to age 65 years and to life expectancy; U.S. maps showing the geographic distribution of mortality by state; and tables and figures summarizing selected occupational exposure data for asbestos, coal and coal mine dust, silica dust, cotton dust, and other substances. Proportionate mortality ratios by industry and occupation are based on the most recent decade of data from a subset of states for which usual industry and occupation have been coded for decedents. Also included are tables summarizing silicosis and asthma surveillance data collected by states funded by the Sentinel Event Notification Systems for Occupational Risks Program.