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DFE World: Design & the Global Environment
Photograph of Nature
Air Pollution

Effective Stack Height
Mixing Height & Inversions
Model Output
Sensitivity Analysis


Central Campus Air Quality Model (CCAQM) Instructions


Model Outputs

From the point source Gaussian dispersion equation for a smokestack of interest, you can calculate the ground level concentration of the pollutant of interest at any receptor.  The concentrations of the pollutants from the line and point sources are added to get a total concentration of the pollutant.  An example of a point source modeled in addition to the central campus network of line sources for CO, is given below.


Example Model Output - Total CO Concentrations at Designated Receptors



  • Emission rates downwind of the source are averaged over time and can be represented by a normal distribution.

  • Emission rate from the smokestack is constant.

  • Wind speed is constant at the effective stack height.

  • The pollutant, carbon monoxide (CO), does not decay, chemically react, or deposit.

  • The ground does not absorb the pollutant. All of the pollutant is reflected.

  • The surrounding land is flat and free of obstructions.

  • Dispersion occurs only in the y and z directions.