This report presents the results obtained from an experimental study of the accuracy and precision of the measurement of atmospheric levels of sulfur dioxide by the West-Gaeke method according to ASTM Method D 2914(1) . The evaluation of D 2914 was performed as part of the first phase of Project Threshold, a comprehensive program to validate ASTM methods of measuring various atmospheric contaminants, including also nitrogen dioxide, lead, dustfall, total sulfation, and particulate matter in Phase 1. |