Apr 22 2010 - 4:00pm
Presented by Dr. Douw G. Steyn, Dept. of Earth and Ocean, UBC. The prevailing conception of photochemical smog has been one of an urban based problem that is expressed at a regional scale. Dr Steyn will outline the ideas that lead to this conception, and then will show evidence that photochemical smog has a hemispheric (if not global) expression. He will examine the links between northern hemisphere development, and the global distribution of ozone, and will show how regional smog management initiatives have reduced peak (episode) values, while increasing lower concentrations, thus contributing to an increase in the hemispheric background ozone pollution levels. This presentation concludes with an examination of the environmental, health and management consequences of these changes.