As part of the 1995 Integrated Measurement Study (IMS95), external quality assurance audits were perfomed earyl in the study to assure the accuracy and validity of the data being collected. Audits were performed for all of the air quality samplers and continuous analyzers connected with the study, as well as for the surface and upper air meteorological measurements performed during the study. This paper briefly describes the audits perfomed for the IMS95 wintertime mearuements and presents the audit results, including esimates on measurement accuracy for the study instrumentation.
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