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George Kallos, Marina Astitha, Petros Katsafados, and Chris Spyrou

year, washout mechanisms are important. The photochemical processes are not at their peak because of limited insolation and cloud formation. During the warm period of the year, the wet-removal processes are very limited and strong insolation promotes the photochemical processes ( Varinou et al. 1999 ; Varinou 2000 ; Kotroni et al. 1999 ). The photochemical processes result in the appearance of high ozone concentrations in the vicinity of urban areas as well as in remote locations ( Pilinis et al

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M. Talat Odman, Yongtao Hu, Alper Unal, Armistead G. Russell, and James W. Boylan

case and another with reduced emission inputs. This method is known as the “brute force” method ( Hwang et al. 1997 ). The model used here to simulate the air quality is the Community Multiscale Air Quality (CMAQ) model ( Byun and Ching 1999 ). Brute-force sensitivity analysis has been widely used to aid the design of control strategies for ozone. For example, recently, Marr and Harley (2002) studied the impact of motor vehicle emissions on ozone levels in central California using the California

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