f =  frequency of occurrence of the ith wind‑speed category, the jth wind‑direction category and the kth stability category for the lth season Δθ´ =  the sector width in radians R =  radial distance from lateral virtual point source (for building downwash) 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 (see Equation (1‑35)), equals zero for point sources without building downwash, and for downwash sources that do not experience lateral dispersion enhancement (m)

 S =  a smoothing function similar to that of the AQDM (see Section 2.1.8) us =  mean wind speed (m/sec) at stack height for the ith wind‑speed category and kth stability category σz =  standard deviation of the vertical concentration distribution (m) for the kth stability category V =  the Vertical Term for the ith wind‑speed category, kth stability category and lth season D =  the Decay Term for the ith wind speed category and kth stability category

The mean annual concentration at the point (r,θ) is calculated from the seasonal concentrations using the expression:

351 - 352 - 353 - 354 - 355 - 356 - 357 - 358 - 359 - 360 - 361 - 362 - 363 - 364 - 365 - 366 - 367 - 368 - 369 - 370 - 371 - 372 - 373 - 374 - 375 - 376 - 377 - 378 - 379 - 380 - 381 - 382 - 383 - 384 - 385 - 386 - 387 - 388 - 389 - 390 - 391 - 392 - 393 - 394 - 395 - 396 - 397 - 398 - 399 - 400

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