This document represents Volume 4 of a 5-volume quality assurance (QA) handbook series. This volume is dedicated to meteorological measurement systems and their support equipment. Volume I provides general QA guidance that is pertinent to the remaining volumes. Volume II is dedicated to the Ambient Air Quality Surveillance Program and the data collection activities of that program. Volume III pertains to Source and Emission monitoring methods. Volume V pertains to ambient dry deposition. This document, Volume IV, is designed to provide clear and concise information and guidance to the State/Local/Tribal (SLT) air pollution control agencies that operate meteorological monitoring equipment and systems. Recently, the new monitoring rule was published, which establishes the requirements for meteorological monitoring in support of National Core (NCore) network. The new monitoring rules require that meteorological data be collected at all NCore stations, as stated in the Code of Federal Regulations (CFR) Chapter 40 Section 58, Appendix D.3.b. Thus, there is a need for updated information to guide the SLT agencies as they implement the NCore network.

EPA project officer: Dennis K. Mikel. Revision of EPA-600/R-94-038d "Quality Assurance Handbook for Air Pollution Measurement Systems : Volume IV : Meteorological Measurements, as revised August 1989." "October 2006." Draft. Includes bibliographical references. "EPA-454/D-06-001."