For a Gaussian, sector-averaged plume, the hourly concentration at downwind distance x (meters) and crosswind distance y (meters) is given by:

where:

=  pollutant emission rate (mass per unit time),

 K =  units scaling coefficient (see Equation (1‑1)) Δθ´ =  the sector width in radians (=0.3927) R =  radial distance from the point source to the receptor = [(x+xy)2 + y2]1/2 (m) x =  downwind distance from source center to receptor, measured along the plume axis (m) y =  lateral distance from the plume axis to the receptor (m) xy =  lateral virtual distance for volume sources (see Equation (1‑35)), equals zero for point sources (m)

 us =  mean wind speed (m/sec) at stack height σz =  standard deviation of the vertical concentration distribution (m) V =  the Vertical Term (see Section 1.1.6) D =  the Decay Term (see Section 1.1.7) CORR =  the attenuation correction factor for receptors above the plume centerline height (see Section 1.5.8)

Equation (1‑93) includes a Vertical Term, a Decay Term, and a vertical dispersion term (σz).  The Vertical Term includes the effects of source elevation, receptor elevation, plume rise, limited vertical mixing, gravitational settling and dry deposition.

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castellano: DISPER CUSTIC DESCAR RADIA    italiano:

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deutsch: DIS CUS  DES  RAD

castellano: DIS CUS DES  RAD   english: DIS CUS DES RAD

português: DIS CUS DES RAD   italiano:   DIS CUS  DES RAD

français:  DIS CUS DES RAD