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Krish Vijayaraghavan has over 20 years of experience in air quality modeling and analysis, with particular expertise in linkages with watershed models and emissions models and linking with human health and ecological risk assessments. He has experience with a wide array of air quality models, from the local to the global scale, and puff and plume-in-grid models. Krish has directed modeling studies of photochemical air pollution (ozone, particulate matter); exposure to air toxics, such as mercury and arsenic; and atmospheric deposition of sulfur, nitrogen, mercury and other gases. He has investigated the impact of fuel and technology changes in on- and off-road mobile sources. He also has examined the relation between global climate change and regional pollution using satellite data and models, on a NASA grant. Krish has conducted National Environmental Policy Act (NEPA) assessments of hazardous and criteria air pollutants for power plant, aircraft, oil and gas, transportation and mining projects. He has published over 40 peer-reviewed papers in scientific journals, conducted training for state regulators and other stakeholders and provided expert witness testimony on mercury deposition. He served as chair for technical sessions on mercury at the Energy and Environment Conference, and is currently a reviewer for several internationally renowned journals.