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C. Hogrefe, W. Hao, K. Civerolo, J.-Y. Ku, G. Sistla, R. S. Gaza, L. Sedefian, K. Schere, A. Gilliland, and R. Mathur

. J. Geophys. Res. , 108 . 4183, doi:10.1029/2001JD001409 . Black , T. , 1994 : The new NMC mesoscale Eta Model: Description and forecast examples. Wea. Forecasting , 9 , 265 – 278 . Byun , D. W. , and K. L. Schere , 2006 : Review of the governing equations, computational algorithms, and other components of the Models-3 Community Multiscale Air Quality (CMAQ) modeling system. Appl. Mech. Rev. , 59 , 51 – 77 . Cai , C. , 2006 : Implementation and performance evaluation of an

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Ho-Chun Huang, Xin-Zhong Liang, Kenneth E. Kunkel, Michael Caughey, and Allen Williams

threshold was established for the NGE using monthly and seasonal means, the result nonetheless suggests that the current modeling system successfully simulated the main monthly characteristics with acceptable accuracy. The results indicate that traditional model evaluation criteria based on monthly mean statistics may be more suitable in evaluating the true performance of a climatic modeling system. The climatic air quality studies are different from the past historical air quality studies, especially

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John S. Irwin, William B. Petersen, and Steven C. Howard

the research community but with those conducting operational assessments of air quality impacts and with decision makers. b. Implications for model evaluation studies The variability in the trajectory is likely larger than the entire plume or puff width, which will preclude a pairing in time and space of model and observation results for the statistical evaluation of dispersion model performance. A better approach would be to separately characterize the differences seen in the transport and the

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Armin Aulinger, Volker Matthias, and Markus Quante

. , and Coauthors , 2005 : Modelling of POP contamination in European region: Evaluation of the model performance. Meteorological Synthesizing Centre-East, EMEP MSC-E Rep. 7/2005, 133 pp . Wania , F. , and D. Mackay , 1999 : The evolution of mass balance models of persistent organic pollutant fate in the environment. Environ. Pollut. , 100 , 223 – 240 . Wild , S. R. , and K. C. Jones , 1995 : Polynuclear aromatic hydrocarbons in the United-Kingdom environment—A preliminary source

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Golam Sarwar and Prakash V. Bhave

Protection Agency’s (USEPA) Community Multiscale Air Quality (CMAQ) modeling system, version 4.5, was used for this study. Model performance evaluations for this modeling system have been conducted by comparing model predictions with measured ambient pollutants obtained from several measurement networks (Appel et al. 2007, manuscript submitted to Atmos. Environ. ). As mentioned earlier, chlorine emissions are not typically included in photochemical models for air quality and the CMAQ model performance

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

photochemical air pollution in central California. Environ. Sci. Technol. , 36 , 4099 – 4106 . Menut , L. , R. Vautard , M. Beekmann , and C. Honore , 2000 : Sensitivity of photochemical pollution using the adjoint of a simplified chemistry-transport model. J. Geophys. Res. , 105 , 15379 – 15402 . Morris , R. E. , and Coauthors , 2004 : Model performance evaluation and model sensitivity tests for three Phase I episodes. ENVIRON to VISTAS, 112 pp. [Available online at http

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Edith Gégo, P. Steven Porter, Alice Gilliland, and S. Trivikrama Rao

Agency (EPA) has promulgated a National Ambient Air Quality Standard (NAAQS) for ozone. In the mid-1990s, most northeastern states struggled with the attainment of the ozone NAAQS. At that time, computer modeling and analyses conducted by Ozone Transport Assessment Group (OTAG)—a partnership among the EPA, states, and industry—revealed the importance of interstate transport of ozone and its precursors in addressing the ozone problem over the eastern United States. Corroborating the findings of

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