Aermod dispersion modelling

Question for air pollution modelers, who use AERMOD VIEW.

I am modelling air pollution for a pig farm. Pig farm ventilation systems operate differently each month, so I have to implement those changes throughout the year. I don’t see the way how to do that because only variations I can use, are now being applied for “emission rate”. F.e., if I apply variation 0,7 for certain source, it will reduce emission rate (from 1 g/s to 0,7 g/s) not gas exit flow rate (from 1 m3/s to 0,7 m3/s). Lower ventilation power contributes to higher emissions, but AERMOD does the opposite now.

The question is whether it is possible to apply variations to the parameter “gas exit flow rate”?

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