At local sites, e.g. in streets, the NO2 pollution is governed partly by the local
emission of NO and NO2. It is important again to emphasis the non-linearity of the
governing chemistry for NO2 . During most periods NO2 levels near urban streets are
limited by the ozone levels and not by the NOx releases in the street. This means that
the very local scale phenomenon of high NO2 concentrations in a street is coupled to
large scale phenomena, since high ozone concentrations are caused by long range
transport. However, in streets, short term peak concentrations may occur and here the
short term limit value for protection of health is the most critical.
In order to construct a model tool for determining the effects of different control
strategies, local scale dispersion and chemistry of nitrogen compounds and ozone, as
well as long range transport of ozone (and to some extend NOx ) must be taken into
account. The only practical way to construct such a tool is to combine a transportchemistry
model for long range transport to a local scale model for a single street.
However, the long range transport model also has to be able to account for the
dispersion and chemistry on an urban scale of a few kilometres.
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castellano: DISPER CUSTIC DESCAR RADIA italiano:
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
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