The Symposium on Calibration in Air Monitoring was presented at the University of Colorado at Boulder, Colo., 5-7 Aug., 1975. The symposium was sponsored by The American Society for Testing and Materials through its Committee D-22 on Methods of Sampling and Analysis of Atmospheres. R. L. Chapman, Beckman Instruments, Inc., presided as symposium chairman. D. C. Sheesley, Ambient Analysis, Inc., presided as symposium cochairman.