Environmental Engineering Reference
In-Depth Information
Fig. 9
Hourly average CO concentration around an intersection near Budapest
A sensitivity analysis of CALINE4 model was also carried out. CO concentra-
tion was estimated to the distance from a roadway for typical daytime conditions.
Wind was perpendicular to the roadway. It was established that good results could
be obtained at receptors located within 500 m from the roadway.
CALINE4 model provides a possibility to predict air pollutants near intersections.
Spatial distributions of hourly averaged CO and NO
2
concentrations are shown in
Figs.
8
and
9
for an intersection near Budapest. The distance between receptors
(indicated by crosses in the figures) is 100 m. Air pollutants are transported by
the most frequent airflow to the SW direction. At this intersection the traffic of
motorway M7 is dominant.
Conclusion
Examples simulated by a road dispersion model showed that acceptable results
could be obtained in order to consider detailed effect of traffic flow. Using a dispersion
model connected to an emission model is a good tool to estimate air quality where
ground based measurements are not available or not possible.
