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Harold S. Johnston (1920–2012)

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Abstract

One of the most exceptional atmospheric chemists of the twentieth century, Harold “Hal” S. Johnston died on 20 October 2012 at the age of 92. Hal's pioneering work on atmospheric kinetics, both in laboratory and theoretical studies, greatly advanced understanding of the processes affecting ozone in the troposphere and stratosphere, especially related to the chemistry and impacts resulting from nitrogen oxides (NOx ).

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