# Atmospheric Dispersion Calculator

## Air Pollution Control Stacks Equation Formulas

### Solving for stability parameter.

#### Inputs:

 wind speed at elevation (u) meter/secondcentimeter/hourcentimeter/secondfoot/dayfoot/hourfoot/minutefoot/secondinch/dayinch/hourinch/minuteinch/secondkilometer/daykilometer/hourkilometer/minutekilometer/secondknotmach sea level 15 Cmeter/daymeter/hourmeter/minutemile/daymile/hourmile/minutemile/secondmillimeter/secondspeed of light in vacuumyard/second
 weather station wind speed (u0) meter/secondcentimeter/hourcentimeter/secondfoot/dayfoot/hourfoot/minutefoot/secondinch/dayinch/hourinch/minuteinch/secondkilometer/daykilometer/hourkilometer/minutekilometer/secondknotmach sea level 15 Cmeter/daymeter/hourmeter/minutemile/daymile/hourmile/minutemile/secondmillimeter/secondspeed of light in vacuumyard/second
 weather station elevation (h0) meterangstromattometercentimeterchaindekameterdecimeterexameterfemtometerfootgigameterhectometerinchkilometerlight yearlinkmegametermicrometermicronmilemillimeternanometerparsecpetameterpicometerrodterameteryard

#### Conversions:

 wind speed at elevation (u)= 0 = 0meter/second
 weather station wind speed (u0)= 0 = 0meter/second
 elevation (h)= 0 = 0meter
 weather station elevation (h0)= 0 = 0meter

#### Solution:

 stability parameter (n)= NOT CALCULATED

#### Other Units:

Change Equation
Select to solve for a different unknown
Gaussian plume dispersion model developed by Pasquill
 plume contaminant concentration at a point in space plume contaminant concentration at ground level contaminant concentration at ground level alongthe plume centerline contaminant concentration at ground level alongthe plume centerline when the emission source isat ground level
wind speed at elevation from known wind speed and elevation
 wind speed at elevation weather station wind speed elevation weather station elevation stability parameter
effective stack height
 effective stack height physical stack height plume rise
 plume rise stack gas exit speed stack diameter average wind speed stack heat emission rate
plume rise for neutral stability conditions
 plume rise stack gas exit speed stack diameter average wind speed stack heat emission rate
 plume rise stack gas exit speed stack diameter average wind speed stack heat emission rate
Where
 C = downwind concentration Q = pollution source emission rate u = average wind speed σy = y direction plume standard deviation σz = z direction plume standard deviation x = position in the x direction or downwind direction y = position in the y direction z = position in the z direction H = effective stack height

References - Books:
1) P. Aarne Vesilind, J. Jeffrey Peirce and Ruth F. Weiner. 1994. Environmental Engineering. Butterworth Heinemann. 3rd ed.

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