1. Class Project Report, Spring 2014 E 449/549 Sustainable Air Quality Sustainability Transition of Sulfurous Air Quality 1960-2013 Emissions and Causality Drivers - Lesley Olson Ambient Sulfurous Air Quality - Andrew Marthus Control Measures - Jennifer Elwell Instructor: Rudolf B. Husar Washington University, St. Louis, MO, May 2, 2014

2. Instructions for the presentations Use about 10-12 slides to explain your sub-project For each slide, add a one-line title on the top Label all figures appropriately Add a concise but informative description as notes, The title, figures/labels, notes should make the slide self-describing More details (e.g. lit. sources, links, explanations) for each slide in the wiki

3. Ambient Air Quality (ppm) Air Quality Factor (ppm/T)

4. Population increases at constant rate of approximately 1%/year. Per capita GDP increases at an increasing rate. The emissions factor decreases slightly, and relatively constantly over time. Energy intensity decreases at a decreasing rate; note the shift in derivative magnitude that occurs around 1985. Oil embargo (1973) Recession (2008) Energy Intensity Driven Per Capita GDP Driven

5. First decade with decrease in overall carbon emissions occurs.

6. Population, per capita GDP, and energy intensity are the same as they were for carbon emissions, because we are dealing with U.S. totals. Unlike the carbon emissions factor, the sulfur emissions factor has decreased considerably since 1970. The overall emissions trend moves with the emissions factor trend. Clean Air Act (1970) Clean Air Act (1990)

8. Only difference between two sets of drivers: the emissions factor.

10. Source: Jen ElwellJen Elwell PROCESS CONTROLS