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4.3.7 The
Model PROKAS for Calculating Air Pollution on Roads
The model PROKAS
(BOESINGER, 1996; VDI 3782, Section 8) calculates air pollution
along roads on the basis of a Gaussian dispersal model for
individual sections of road and road networks. For the
calculation of emissions on roads with dense peripheral
development, an integrated building model is employed that uses
results based on calculations with MISKAM as well as results
from wind tunnel studies and field experiments.
The emissions
densities for individual sections of road are essentially
determined by the traffic volumes, the type of driving, the
reference year, and the time-elapsed emissions curves of the
emissions factors (cf. Chapter 2.8.2).
In addition, the
use of PROKAS requires representative dispersal class statistics
with data about the wind velocity, wind direction, and dispersal
class distribution.
Figure
4/43a and Figure 4/43b,
generated with PROKAS, shows NO2 levels for Stuttgart’s
main streets (> 5,000 vehicles/day) for the year 2010 and
2015. Easily
recognizable are the highway in the south and the
heavily-trafficked streets in the central city and the Neckar
Valley, with values up to 80 µg/m3.
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