Online Air Dispersion Model


The key foundational air dispersion models used to estimate air pollution impacts is the Gaussian plume model. Most regulatory air dispersion models, such as SCREEN3 and AERMOD are based on the principles of Gaussian plume dispersion.


The Gaussian plume dispersion calculation allows you to calculate potential concentration of a pollutants downwind of a source by defining a number of parameters:


  • Step 1: Determine the atmospheric stability class
  • Step 2: Calculate wind speed at the stack height
  • Step 3: Calculate plume rise
  • Step 4: Determine dispersion parameters σy and σz
  • Step 5: Calculate downwind pollutant concentration


Use WKC’s 5-step online tool below to calculate the potential downwind concentration from a point emission source. This follows the principles of USEPA Screen 3.



For more information on the Gaussian dispersion model and any of the steps in this calculator, visit Lakes Environmental‘s online ISCST3 Tech Guide, as well as Wikipedia’s page on Atmospheric dispersion modeling. Also, see our effective flare stack height calculator that can be used to calculate the effective stack height of a flare.



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Please note that this or any other calculators on the tools room are for information only. WKC Group has endeavoured to ensure that the information presented here is accurate and that the calculations are correct, but will not accept responsibility for any consequential damages, faults or human errors that may arise from the use of formulas, inventories and values.