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sci.contaminant-dispersion-gaussian Calculator
Calculates ground-level pollutant concentration from a stack using the Gaussian plume dispersion model with Pasquill-Gifford stability classes. Gaussian plume concentration falls as 1/r² downwind and as exp(−y²) crosswind — peak ground concentration typically occurs 0.5–5 km downwind depending on stack height.
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 M
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Sigma Y M
Reference formula or conversion factor shown for context.
Sigma Z M
Reference formula or conversion factor shown for context.
Results
centerline ground concentration (µg/m³)
The proportional relationship between two quantities.
emission rate
The value at the specified point or condition.
wind speed
The computed rate of movement or processing.
C = Q/(π·u·σy·σz)
Reference formula or conversion factor shown for context.
WHO PM2.5 limit
Reference formula or conversion factor shown for context.
Pasquill stability class
Measure of how robust the system, structure, or process is to perturbations. Low stability means small changes can cause large deviations.