// multi-utility computation suite · offline · instant · precise
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env.air-pollutant-dispersion Calculator
Models the downwind concentration of an air pollutant from a point source (chimney or stack) using the Gaussian plume dispersion equation, accounting for wind speed and atmospheric stability class. Used in environmental impact assessments and regulatory permit applications.
Inputs
Emission Rate Gs
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Wind Speed Ms
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
Sigma Y M
Reference formula or conversion factor shown for context.
Sigma Z M
Reference formula or conversion factor shown for context.
Distance M
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Results
centerline concentration (µg/m³)
The proportional relationship between two quantities.
emission rate (g/s)
The value at the specified point or condition.
wind speed
The computed rate of movement or processing.
Gaussian plume formula: C = Q/(π×σy×σz×u)
The specific form or variant of the result.
σy, σz
Reference formula or conversion factor shown for context.
EPA AERMOD
Reference formula or conversion factor shown for context.