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With the Standard Analysis, MATS can forecast daily PM2.5 design values at monitor locations. MATS can also calculate quarterly model data files and a species fractions file. The Choose Desired Output window lets you specify the type of calculation(s) that you would like MATS to perform. These different assumptions are discussed in the Output Choice section of the Daily PM Analysis: Details chapter.

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In the Output Choice Advanced window, MATS lets you choose from among a variety of options that are generally used for quality assurance (QA). Details regarding these choices are in the Output Choice - Advanced section of the Daily PM Analysis: Details

In the Data Input window, you specify the MATS input files that are used in each scenario. There are three main types of files which must be specified. These include ambient PM2.5 species data, ambient total PM2.5 data (FRM and IMPROVE), and gridded model output data (e.g. CMAQ or CAMx data). There is specific terminology that is used on the Data Input page. "Official" data refers to PM2.5 FRM data that can be used to determine official design values for compliance purposes (comparison to the NAAQS). Other datasets which may not have rigid regulatory significance are sometimes referred to as "unofficial" data. The format for the data is in the Data Input section of the Daily PM Analysis: Details chapter.

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The Species Fractions Calculation Options has two main sections. One involving speciated monitor data (e.g., STN and IMPROVE monitors) and the other total PM2.5 monitor data (FRM and IMPROVE). For each type of data you can specify the years of interest, whether you want to delete certain data, and the minimum amount of data for a monitor to be considered "valid" (and thus included in the calculations). Details on these options are in theSpecies Fractions Calculation Options section of the Daily PM Analysis: Details chapter.

The Species Fractions Calculation Options - Advanced screen allows you to make relatively advanced choices for your analysis. Generally speaking, the default options settings are consistent with the EPA modeling guidance document (note: the start and end years should always be set to match the relevant base modeling year). A first set of options provides different options for choosing peak monitor days. A second set of options allows you to specify the interpolation weighting that you want to use and whether the

interpolation involves a maximum distance or not. The third set of options involves choices regarding ammonium, blank mass, and organic carbon. Details on these options are in the Species Fractions Calculation Options - Advanced section of the Daily PM Analysis: Details chapter.

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The PM2.5 Calculation Options window allows you to specify the particular years of monitor data that you want to use from the input file you specified in the Data Input

section. You can specify whether monitors should have a minimum number of design values or a design value for a particular year. You can also specify how to calculate future NH4 levels. Details on these options are in the PM2.5 Calculation Options section of the

You also can use the Model Data Options to specify how to use the model data. This is described in the Model Data Options section of the Daily PM Analysis: Details chapter.

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3.1.3

Ozone Analysis

MATS can forecast ozone design values at monitor locations -- these forecasts are referred to as Point Estimates. MATS can also use a variety of approaches to calculate design values for a Spatial Field. The Choose Desired Output window lets you specify the type of calculation(s) that you would like MATS to perform. These different assumptions are discussed in the Choose Desired Output section of the Ozone Analysis: Details chapter.

The Data Input window lets you specify the data files that you want to use. MATS comes populated with default data sets, but you can use your own data if you choose. The format for the data is in the Data Input section of the Ozone Analysis: Details chapter.

The Data Input window also lets you choose how to use model data when calculating a

temporal adjustment at a monitor. This is discussed in detail in the Using Model Data

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The Filtering and Interpolation window lets you specify the years of data that you want to use, any restrictions you want to apply when choosing valid monitors (i.e., monitors that MATS use in its calculations), and options on the interpolation method. This is discussed in detail in the Filtering and Interpolation section of the Ozone Analysis: Details chapter.

The RRF and Spatial Gradient window lets you set parameters used in the calculation of

relative response factors (RRF) and spatial gradients. This is discussed in detail in the

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