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The National Bureau of Standards' was established by an act of Congress on March 3, 1901. The Bureau's overall goal is to strengthen and advance the Nation's science and technology and facilitate their effective application for public benefit. To this end, the Bureau conducts research and provides: (1) a basis for the Nation's physical measurement system, (2) scientific and technological services for industry and government, (3) a technical basis for equity in trade, and (4) technical services to promote public safety. The Bureau's technical work is performed by the National Measurement Laboratory, the National Engineering Laboratory, and the Institute for Computer Sciences and Technology.

THE NATIONAL MEASUREMENT LABORATORY provides the national system of physical and chemical and materials measurement; coordinates the system with measurement systems of other nations and furnishes essential services leading to accurate and uniform physical and chemical measurement throughout the Nation's scientific community, industry, and commerce; conducts materials research leading to improved methods of measurement, standards, and data on the properties of materials needed by industry, commerce, educational institutions, and Government; provides advisory and research services to other Government agencies; develops, produces, and distributes Standard Reference Materials; and provides calibration services. The Laboratory consists of the following centers:

Absolute Physical Quantities? Radiation Research — Thermodynamics and
Molecular Science — Analytical Chemistry Materials Science,

THE NATIONAL ENGINEERING LABORATORY provides technology and technical services to the public and private sectors to address national needs and to solve national problems; conducts research in engineering and applied science in support of these efforts; builds and maintains competence in the necessary disciplines required to carry out this research and technical service; develops engineering data and measurement capabilities; provides engineering measurement traceability services; develops test methods and proposes engineering standards and code changes; develops and proposes new engineering practices; and develops and improves mechanisms to transfer results of its research to the ultimate user. The Laboratory consists of the following centers:

Applied Mathematics Electronics and Electrical Engineering
Engineering and Process Technology: - Building Technology
Consumer Product Technology – Field Methods.

Fire Research

THE INSTITUTE FOR COMPUTER SCIENCES AND TECHNOLOGY conducts research and provides scientific and technical services to aid Federal agencies in the selection, acquisition, application, and use of computer technology to improve effectiveness and economy in Government operations in accordance with Public Law 89-306 (40 U.S.C. 759), relevant Executive Orders, and other directives; carries out this mission by managing the Federal Information Processing Standards Program, developing Federal ADP standards guidelines, and managing Federal participation in ADP voluntary standardization activities; provides scientific and technological advisory services and assistance to Federal agencies; and provides the technical foundation for computer-related policies of the Federal Government. The Institute consists of the following centers:

Programming Science and Technology – Computer Systems Engineering.

'Headquarters and Laboratories at Gaithersburg, MD, unless otherwise noted;
mailing address Washington, DC 20234.
Some divisions within the center are located at Boulder, CO 80303.

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U.S. DEPARTMENT OF COMMERCE, Juanita M. Kreps, Secretary

Luther H. Hodges, Jr., Under Secretary

Jordan J. Baruch, Assistant Secretary for Science and Technology


Issued August 1979

Library of Congress Catalog Card Number: 79-600125

National Bureau of Standards Special Publication 557
Nat. Bur. Stand. (U.S.), Spec. Publ. 557, 105 pages (Sept. 1979)




For sale by the Superintendent of Documents, U.S. Government Printing Office, Washington, D.C. 20402

Stock No. 003–003-02111-3 Price $4
(Add 25 percent additional for other than U.S. mailing)


It is increasingly recognized that the integrity of the data input is one of the most serious limiting factors in modeling complex chemical systems. The reliability of the results generated in modeling studies is critical considering their application to environmental regulation and control.

The purpose of this workshop was to bring together modelers, chemical kineticists, theoreticians and program managers, in order to define the critical data needs for modeling the troposphere. This collection of review papers, comments, and recommendations should serve a wide community of atmospheric scientists in identifying and attacking priority problem areas.

The National Bureau of Standards is pleased to be responsible for this publication, and to have joined with the Environmental Protection Agency as cosponsors of the workshop.

John D. Hoffman, Director
National Measurement Laboratory
National Bureau of Standards

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