When more than one output type is selected among the list of CONC, DEPOS, DDEP, and/or WDEP, the PLOTFILE output file will include all of the output types selected, in the order listed here.  The results for each output type will be printed in separate columns, one record per receptor, in the order given above.

     The syntax and type for the TOXXFILE keyword are summarized below:



OU TOXXFILE  Aveper  Cutoff  Filnam  (Funit)


Optional, Repeatable

where the Aveper parameter is the short term averaging period (e.g. 1, 3, 8, 24 for 1, 3, 8 and 24‑hour averages, or MONTH for monthly averages) for which the TOXXFILE option has been selected.  The Cutoff (threshold) parameter is the user‑specified threshold cutoff value in g/m3, and Filnam is the name of the file where the TOXXFILE results are to be written.  It is important to note that the units of the Cutoff parameter are g/m3, regardless of the input and output units selected with the SO EMISUNIT card.  The optional Funit parameter allows the user the option of specifying the Fortran logical file unit for the output file.  The user‑specified file unit must be in the range of 20‑100, inclusive.  If the Funit parameter is omitted, then the model will dynamically allocate a unique file unit for this file (see Section 3.8.2).  While the TOXXFILE option may be specified for any of the short term averaging periods that are identified on the CO AVERTIME card for a particular run, a non-fatal warning message will be generated if other than 1-hour averages are specified.  This is because the TOXST model currently supports only 1-hour averages.

     The TOXXFILE card may be repeated for each averaging period, but a different filename should be used for each file since the structure of the output file generated by the TOXXFILE option does not allow for a clear way to distinguish between results for different averaging periods.  The resulting output file for the Short Term model is an unformatted file with several header records identifying the title, averaging period, receptor information, and the threshold value for that file, followed by records listing every occurrence where the result for any source group for that averaging period equals or exceeds the threshold value.  When one of the source groups exceeds the threshold value, the results for all source groups for that averaging period and receptor location are output.  Each concentration that is output through the TOXXFILE option is paired with an integer ID variable that identifies the averaging period (hour number of the year), the source group number, and the receptor number corresponding to that value.  The concentration values and corresponding ID variables are stored in buffer arrays, and the arrays are then written to the unformatted output file when full.  The size of the arrays is controlled by the NPAIR PARAMETER defined in the MAIN1.INC file, and is initially set at 100.  At the end of the modeling run, any values remaining in the buffer arrays are written to the file, padded to the right with zeroes.  The structure of the output file generated by the TOXXFILE option is described in more detail in Section 3.8.2 and in Appendix F.  When using the TOXXFILE option, the user will normally place a single source in each source group, and may need to modify the array storage PARAMETERs in MAIN1.INC to accommodate certain modeling needs.  The user should refer to the user's guide for TOXST for further instructions on the application of the TOXXFILE option of the ISCST model.


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