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sci.air-pollution-dispersion-Pasquill Calculator
Classifies atmospheric stability using the Pasquill-Gifford method from wind speed, insolation, and cloud cover, and determines dispersion coefficients σy and σz. Class A (very unstable, strong sun, light wind) gives fastest vertical mixing — Class F (stable, night, low wind) produces highest near-field concentrations.
Inputs
U M S
Rate of movement. 1 m/s = 3.6 km/h = 2.237 mph.
H M
Vertical measurement. For health calculators, typically standing height without shoes.
X Km
Separation between two points or total path length. Check that units are consistent throughout the calculation.
Stability Class
Reference formula or conversion factor shown for context.
Q G S
Amount per unit of time or per unit quantity. Check the denominator before interpreting.
Results
ground-level concentration (μg/m³)
The proportional relationship between two quantities.
σy horizontal 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.
C = Q/(π·σy·σz·U)·exp(-H²/2σz²)
Reference formula or conversion factor shown for context.
Pasquill class
The classification assigned based on the computed value.