None of the screening tools available for stacks (e.g. the HMIP D1 method, nomograms in LAQM.TG(09) are applicable to my installation due to a low exit velocity, or buildings taller than the stack. How do I assess its air quality impact?
Low exit velocities can be handled by advanced dispersion models, and even by screening models, such as ADMS-Screen. Complex and tall buildings close to short stacks are a challenge for any predictive technique, and may require sensitivity analyses using more than one dispersion model, or Computational Fluid Dynamics (CFD) if the potential impacts are contentious e.g. in an AQMA or very close to sensitive receptors.