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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

, building upon the operational NWS/NOAA/EPA ozone forecasts while also including the simulation of PM 2.5 . Of special interest is the potential utility of PM 2.5 simulations from CMAQ in supporting the routine air quality forecasting program already established by NYSDEC that is based on statistical techniques and expert judgment ( Gaza 1998 ; NYSDEC 2005 ). Section 2 provides a brief overview of the modeling system as well as the observational databases used in model evaluation. Section 3

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

or puff width. So, for emergency response planning, what is needed is a forecast of the trajectory variability plus an estimate of the probability distribution of the centerline concentration values as a function of transport downwind distance ( Dabberdt and Miller 2000 ). For now, since ensemble mesoscale meteorological forecasts are not routinely available, the trajectory variability could be characterized using the technique we applied to generate nine trajectories, and collocating the results

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

-pollution modeling techniques, together with air-quality observations. Some key issues concerning the knowledge of the air-quality status in the Euro-Mediterranean region are the identification of the geographic distribution of pollutant sources and the regional climatological description for the GMR. The PM levels and composition and European Union (EU) policies addressing PM levels should be kept in mind and are hence briefly discussed herein. Paths and scales of transport and transformation of air pollution

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Armin Aulinger, Volker Matthias, and Markus Quante

to photolytic and photochemical degradation. To simulate adequately the processes that determine the transport, degradation, and deposition of PAHs and other POPs, it is essential to have a chemical transport model that represents the state-of-the-art in atmospheric modeling as well as in aerosol chemistry and dynamics. Only a few modeling techniques have been developed for exploration of atmospheric processes of POPs. These include relatively simple mass balance models that examine the pooling

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

.1029/2003JD004502 . Harley , R. A. , A. G. Russell , G. J. McRae , G. R. Cass , and J. H. Seinfeld , 1993 : Photochemical modeling of the Southern California Air Quality Study. Environ. Sci. Technol. , 27 , 378 – 388 . Hwang , D. , D. W. Byun , and M. T. Odman , 1997 : An automatic differentiation technique for sensitivity analysis of numerical advection schemes in air quality models. Atmos. Environ. , 31 , 879 – 888 . Interagency Monitoring of Protected Visual Environments

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