An intensive field study of ambient aerosols was conducted in Houston between September 14 and October 14, 1978. Measurements at 12 sites were made using (1) two relocatable monitoring systems instrumented for aerosol and gaseous pollutants, (2) a network of high volume samplers and automated virtual dichotomous samplers, and (3) an upper air system incorporating pilot balloon launches at two locations. Monitoring was conducted to characterize four diverse sources of air impacting Houston air quality: ship channel area, the urban area, incoming maritime air, and incoming continental air. The data are organized into a computer compatible, uniform data archive for further analysis. The major findings from a preliminary analysis of the data are presented in this report, along with recommendations for additional areas of study.