Stratospheric chemistry of chlorine compounds . In Proceedings of the Joint Symposium on Atmospheric Ozone. (IAOCC/ICACGP, Dresden, German Democratic Republic).

Stratospheric chemistry chlorofluorocarbons . In Abstracts of the Symposium on Fluorine Compounds in the Environment (Amer. Chem. Soc. 172 nd Nat. Meeting, San Francisco).

Atmospheric Chemistry of Chlorofluorocarbons . In Proceedings of the XV International Congress of Entomology: Symposium on “The Impact of the CFC/Ozone Question on Insecticidal Aerosols ” , p. 399 (Academic Press, New York).

Laboratory measurements of absorption cross sections . In Proceedings of NATO Advanced Study Institute on Atmospheric Ozone, October 1979. A. Aiken, ed. (Report No. FAA-EE-80-20), p. 589.

Kinetics of hydroxyl radical reactions of interest in the stratosphere . In Abstracts of the 28th IUPAC Congress (Int. Union of Pure and Applied Chem., Vancouver, Canada).

Laboratory chemistry and stratospheric ozone . In Proceedings of the Indo-US Workshop on Global Ozone Problem (New Delhi, India).

Rates of reaction of OH with HNO 3 and with HCl . In Abstracts of the Amer. Chem. Soc. 185th National Meeting, Div. of Environmental Chemistry (Seattle, WA).

Heterochemical studies on ice chemistry. In Report of the Fluorocarbon Program Panel Meeting, Chemical Manufacturer's Association (Edinburgh, Scotland).

Ice chemistry and Antarctic ozone . In Abstracts of the Symposium on Heterogeneous Reactions in the Atmosphere, Pacific Conference on Chemistry and Spectroscopy (Irvine, CA).

Heterogeneous chemical processes in ozone depletion. In Proceedings of the Symposium on Ozone Depletion, Greenhouse Gases and Climate Change, Board on Atmospheric Sciences and Climate (National Academy of Sciences, Washington, DC).

Chlorofluorocarbons in the environment: A review. In Proceedings of the Symposium on Environmental Fate of Organochlorine Compounds in the Atmosphere, 36 th ASMS Conference on Mass Spectroscopy and Allied Topics (ASMS, San Francisco, CA).

The chemical mechanisms for ozone loss over Antarctica . In Abstracts of the Symposium on Current Trends in Atmospheric Sciences, International Congress of Geochemistry and Cosmochemistry (Paris, France).

The chemistry of some reactions believed to be important in ozone depletion over Antarctica . In Proceedings of the International Ozone Symposium. R. Bojkov and P. Fabian, Eds. (Deepak, Hampton, VA).

Global atmospheric chemistry of halogens . In Abstracts of the International Symposium on Global and Regional Environmental Atmospheric Chemistry (Beijing, China).

Laboratory chemistry and stratospheric clouds . In Abstracts of the Symposium on the Role of Clouds in Atmospheric Chemistry and Global Climate (Am. Met. Soc., Anaheim, CA).

Heterogeneous chemistry in the Antarctic stratosphere . In Abstracts of the Symposium on Fundamental Kinetic Processes Linking CFC Release to Global Ozone Destruction in the Polar Stratosphere (Am. Chem. Soc., Dallas, TX).

Heterogeneous chemistry on polar stratospheric clouds . In Abstracts of the Symposium on the Climate Effects on Aerosols (Am. Assoc. for Aerosol Res., Reno, NV).

Stratospheric ozone: Current Concerns . In Abstracts of the Symposium on Global Environmental Chemistry - Challenges and Initiatives (Am.. Chem. Soc., Miami, FL).

Chemistry of Antarctic ozone depletion. In Abstracts of the 3rd Intl. Conference on Southern Hemisphere Meteorology and Oceanography (Am.. Met. Soc., Buenos Aires, Argentina).

Chemistry of Polar Ozone Depletion . In Abstracts of the Twentieth International Symposium on Free Radicals (Shizuoka, Japan).

Heterogeneous Chemical Processes. In Abstracts of the American Chemical Society 200th National Meeting, Division of Physical Chemistry (Washington, DC).

Chemistry of Stratospheric Ozone Depletion . In Abstracts of the 12th International Symposium on Gas Kinetics (Reading, UK).

An Overview of Polar Ozone Depletion . In Science at the Frontier 2 , National Academy of Sciences/National Research Council (Irvine, California).

Stratospheric Ozone . In Abstracts of the Scheele Symp. on Oxygen (Stockholm, Sweden).

Stratospheric Ozone Depletion . In Abstracts of the Atmospheric Chemistry Symposium of the 1993 Pittsburgh Conference on Analytical Chemistry (Atlanta, GA).

The Role of Photochemistry in Stratospheric Ozone Depletion . In Abstracts of the XVIth International Conference on Photochemistry (Vancouver, Canada).

Chemical Mechanisms of Atmospheric Ozone Depletion. 7th BOC Priestly Conference (Lewisberg, PA).

HCl vapor pressures and reaction probabilities for ClONO2 + HCl on liquid H2SO4-HNO3-HCl-H2O solutions. Faraday Discussions on Atmospheric Chemistry (Norwich, UK).

Monitoring the Ozone Hole. Conference on The Habitability of the Earth, Princeton University's 250th Anniversary Celebration (Princeton, NJ).

Stratospheric Ozone Depletion: A Global Problem. The Third Annual William Nordberg Memorial Lecture, Goddard Space Flight Center (Greenbelt, MD).

The Chemistry of Polar Ozone Depletion . Cornell University (Ithaca, NY).

Heterogeneous Reactions - A New Perspective in Atmospheric Chemistry. CIBA Foundation/Royal Society Discussion Meeting on Atmospheric Chemistry and Global Change (London, UK).

Chemistry of Ice Particles , Ida Beam Distinguished Visiting Professor Lecture Series, University of Iowa (Iowa City, Iowa).

Chemical Kinetics Studies of Atmospheric Reactions , Creative Advances in Envir. Sci. & Tech. Award Symposium at the213th National ACS meeting (San Francisco, CA).

Global Change Research: Cooperation in the Americas, Special Symposium on Science Policy and Scientific Cooperation in the Americas, Fifth Chemical Congress of North America (Cancun, Mexico).

The Chemistry of Ice Clouds , Canon Visiting Scholar, The College of William and Mary (Williamsburg, Virginia).

A Perspective on StratosphericOzone Depletion , Plenary Lecture, 1999 Annual Meeting of the American Academy of Dermatology (New Orleans, LA)

The Impact of Human Activities on Atmospheric Ozone , Shirley A. Kliegel Lectureship in Geological and Planetary Sciences, California Institute of Technology (Pasadena, CA).

Physical Chemistry of Atmospheric Inorganic Aerosol: Solids or Liquids? Chancellor's Science Seminar Series, University of North Carolina (Chapel Hill, NC).

The Role of the Evaluation of Kinetics and Photochemical Data in the Ozone Depletion Issue , American Geophysical Union Spring Meeting (Boston, MA).

Global Atmospheric Pollution: Ozone Depletion and Climate Change , A Century of Nobel Prizes: Science and Humanism, UNESCO/Interdisciplinary University of Paris (Paris, France)

Global Atmospheric Chemistry: Challenges for the Coming Decade, 1999 Distinguished Guest Lecture, Royal Society of Chemistry (London, UK).

An overview of the Chemistry of Atmosphere Particulates in the Stratosphere and Troposphere

NARSTO 2000 Symposium on Tropospheric Aerosols (Querétaro, Mexico).

Global Change and the Antarctic Ozone Hole , Jubilee Plenary Session on Science and the Future of Mankind, Pontifical Academy of Sciences (Vatican).

Urban, Regional and Global Air Pollution , Keynote Address, 12 th World Clean Air and Environment Congress (Seoul, Korea).

Environmental Impact of Energy, Energy Day, British Chamber of Commerce (Mexico City, Mexico).

Surface Chemistry of Atmospheric Aerosols, the 11 th Annual George C. Pimentel Memorial Lecture, University of California, Berkeley (Berkeley, California).

Surface Chemistry of Atmospheric Aerosols, American Chemical Society 224 th National Meeting (Boston, MA).

Atmospheric Chemistry and Flow Reactors, and Surface Chemistry of Atmospheric Aerosols, Kaufman Lectures, University of Pittsburgh (Pittsburgh, PA).

The Antarctic Ozone Hole, Chemical Engineering Graduate Students Association Symposium, Carnegie Melon University (Pittsburgh, PA).

El Impacto de las Actividades Humanas en la Atmósfera, Keynote address, XXVIII Congreso de Ingeniería Sanitaria y Ambiental (Cancún, Mexico).

The impact of human activities on the chemistry of the atmosphere 28th International Union of Geodesy and Geophysics, General Assembly (Sapporo, Japan).