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3.2.4 Specifying the Pollutant Type

     The POLLUTID keyword is used to identify the type of pollutant being modeled for a particular run.  The syntax, type, and order of the POLLUTID keyword are summarized below:

Syntax:

CO POLLUTID  Pollut

Type:

Mandatory, Non‑repeatable

Order:

Must follow MODELOPT and precede HALFLIFE and DCAYCOEF

where the Pollut parameter may be name of up to eight characters.  Examples include SO2, NOX, CO, PM10, TSP, and OTHER.  The only choices that currently have any impact on the results are the selection of SO2 in conjunction with URBAN dispersion and the regulatory default option, and the selection of PM10 (or PM‑10) with the multi‑year option for generating the high‑sixth‑high in five years.  For the urban SO2 default case, the model uses a half life of 4 hours for exponential decay of the SO2.

3.2.5 Modeling With Exponential Decay

     The models provide the option to use exponential decay of the pollutant being modeled.  Two keywords are available for this purpose, the HALFLIFE and DCAYCOEF keywords.  The syntax, type, and order of these keywords are summarized below:

Syntax:

CO HALFLIFE  Haflif

CO DCAYCOEF  Decay

Type:

Optional, Non‑repeatable

Order:

Must follow MODELOPT and POLLUTID

where the Haflif parameter is used to specify the half life for exponential decay in seconds, and the parameter Decay is used to specify the decay coefficient in units of s‑1.  The relationship between these parameters is DECAY = 0.693/HAFLIF.

 

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