The odor that our noses detect can be a combination of 60 to 150 different compounds. The odor strength of these compounds do not combine in an additive manner. That is, sometimes mixing several of these compounds can result in reduced odor by dillution of the strongest smelling compounds. In other instances the mixture is worse than any of the individual compounds. Ammonia can create strong odors near the manure storage or building, but is not a significant component of odor downwind from a swine facility.
Ammonia is highly volatile and moves upward in the atmosphere quickly where it is dilluted.
If all of this sounds confusing to you then welcome to the crowd. In order to develop a management plan for odor control the sources of odor must be fully understood.