// multi-utility computation suite · offline · instant · precise
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eng.air-quality-dispersion-simplified Calculator
Calculates downwind air pollutant concentrations using the Gaussian plume dispersion model from stack height, emission rate, and stability class. The Gaussian plume model assumes steady-state conditions and flat terrain — complex terrain and building wake effects require CFD.
Inputs
Emission Rate G S
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Wind Speed M S
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Distance Downwind M
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Stack Height M
Vertical measurement. For health calculators, typically standing height without shoes.
Results
ground-level concentration (µg/m³)
The proportional relationship between two quantities.
σy (lateral dispersion, m)
ISP (specific impulse) — rocket engine efficiency in seconds. Higher ISP means more thrust per kilogram of propellant consumed.
σz (vertical dispersion, m)
ISP (specific impulse) — rocket engine efficiency in seconds. Higher ISP means more thrust per kilogram of propellant consumed.