Emissions from evaporation pond

[EngEnv]

Dear colleagues,

I am trying to calculate ground concentration of ammonia emitted in air from a very big evaporation pond containing a solution of water and ammonia. Usual dispersion models seem not to work appropriately as they do not properly take into account the initial dilution of evaporated ammonia with air before calculating its dispersion, thus overestimating resulting ground concentrations. Any suggestion is appreciated. Thanks.