Quote:
Originally Posted by scottbombedout
Curse you adding in wind profile 
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here is a simple start, assuming laminar flow
if not laminar the I suggest you use eddy correlation techniques, just like us micro-climatologists do
And.... it can contaminate an area al levels lower than you can smell.
or... you may be able to smell it at levels lower than will contaminate an area...
or... it could have synergistic interaction effects with other chemicals present in some areas but not in others... or...