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

.C., to reduce their summertime NO x emissions. To be more specific, the new rule, known as the NO x State Implementation Plan (SIP) Call and hereinafter simply referred to as the SIP Call, required the state air pollution control agencies to identify in their SIP the emission control measures they would implement to meet the new statewide NO x budgets. The EPA, using the so-called 2007 baseline emissions (i.e., the projected emissions for 2007 after the implementation of all-existing laws and

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

visibility days. Every 10 years, progress toward these goals must be demonstrated. The first regional haze state implementation plans (due by December 2007) must demonstrate progress toward natural conditions by evaluating the change in visibility between current conditions (2000–04) and the first progress check point (2014–18). Progress can be measured by comparing the projected visibility on the 20% worst days to a straight line drawn between current visibility (2000–04) and natural conditions (2064

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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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Armin Aulinger, Volker Matthias, and Markus Quante

Deposition Model, version 2, mechanism were converted to the less detailed CB4 mechanism. Although, the reactive species modeled with the CB4 mechanism are not needed for the current B(a)P version of CMAQ, we decided not to simplify the mechanism because all of these reactive species play an important role for the formation of secondary organic aerosols from NMVOCs. Further, they will be needed in our future model versions for which we plan to include chemical degradation of POPs. 4. Boundary and initial

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Steven R. Hanna, Robert Paine, David Heinold, Elizabeth Kintigh, and Dan Baker

. There has been some discussion about problems with various methods ( Freeman et al. 1986 ; Irwin et al. 1987 ; Hanna 2002 ). As a result of planning meetings with the EPA during collaborations on the current project, it was decided to define the following two components of the uncertainty in meteorological inputs and model parameters: 1) the hour-to-hour variations at a single site and 2) the inevitable variations between sites resulting from nonrepresentativeness. These two components are

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