John G. Watson

Research Professor
Division of Atmospheric Sciences

Dr. John Watson has more than 30 years of experience in the environmental sciences, including the conduct and management of major air quality studies designed to evaluate and solve specific pollution problems. He has published more than 200 peer-reviewed journal articles, 80 book chapters, and 200 technical reports. His research includes the development and evaluation of measurement processes, receptor models for source apportionment, causes and amelioration of urban and regional haze, fugitive dust and motor vehicle emissions, and the effects of measurement and modeling uncertainty on pollution control decisions. Dr. Watson is the primary author of EPA's Chemical Mass Balance (CMB) receptor model and its application and validation protocol. He has written EPA guidance documents for network design and continuous monitoring of particle concentrations. Dr. Watson was invited to prepare and present the 2002 Critical Review of "Visibility: Science and Regulation" for the Air and Waste Management Association. He has prepared other critical reviews of receptor-oriented source apportionment methods, fugitive dust emissions, and aerosol measurement methods. He is a member of the editorial reviewboard for Aerosol and Air Quality Research (JAAQR) , an a ssociate editor of the Journal of the Air & Waste Management Association, Chair of the National Academy of Engineering's committee on “Energy Futures and Air Pollution in China and the U.S.”, and a past member of the National Academy of Science committee “Effect of Changes in the New Source Review Programs for Stationary Sources.”

RESEARCH AREAS:

• Source Apportionment, Visibility, Particle Sampling and Analysis, Field Study Design and Management, Motor Vehicle and Fugitive Dust Emissions.

SELECTED PUBLICATIONS:

Watson, J.G.; Chow, J.C.; Park, K.; Lowenthal, D.H., 2006:

Nanoparticle and ultrafine particle events at the Fresno Supersite; JAWMA, 56, 417-430.

Watson, J.G.; Chow, J.C.; Chen, L.-W.A., 2005:

Summary of organic and elemental carbon/black carbon analysis methods and intercomparisons; Aerosol and Air Quality Research, 5(1), 65-102.

Watson, J.G.; Chow, J.C., 2004:

Receptor models for air quality management; EM, Oct. (10), 27-36.

Watson, J.G.; and Chow, J.C., 2002:

A wintertime PM_2.5 episode at the Fresno, CA, supersite. Atmos. Environ., 36(3), 465-475.

Watson, J.G.; Zhu, T.; Chow, J.C.; Engelbrecht, J.P.; Fujita, E.M.; and Wilson, W.E., 2002:

Receptor modeling application framework for particle source apportionment. Chemosphere, 49(9), 1093-1136.

Watson, J.G., 2002:

Visibility: Science and regulation. JAWMA, 52(6), 628-713.

Watson, J.G.; and Chow, J.C., 2001:

Ambient air sampling. In Aerosol Measurement: Principles, Techniques, and Applications, Second Edition, 2nd ed., P. Baron and K. Willeke, Eds. John Wiley & Sons, New York, NY,
pp. 821-844.

Watson, J.G.; Chow, J.C.; and Fujita, E.M., 2001.

Review of volatile organic compound source apportionment by chemical mass balance. Atmos. Environ., 35(9), 1567-1584.

Watson, J.G.; Chow, J.C.; Bowen, J.L.; Lowenthal, D.H.; Hering, S.V.; Ouchida, P.;
and Oslund, W., 2000:

Air quality measurements from the Fresno supersite. JAWMA, 50(8), 1321-1334.

Watson, J.G., 1984:

Overview of receptor model principles. JAPCA, 34(6), 619-623.

Watson, J.G.; Cooper, J.A.; and Huntzicker, J.J., 1984:

The effective variance weighting for least squares calculations applied to the mass balance receptor model. Atmos. Environ., 18(7), 1347-1355.