The residential sites, which are important for estimation of exposure of the population,
often coincide with the urban background sites, but may also be influenced
significantly by point sources or traffic.
The air pollution around industrial sites is regulated in many countries by local
authorities. It is not possible to determine the air quality around point sources and
possible exceedances of short term limit values are not possible to determine without
a large number of monitoring stations. The best way is to combine emission estimates
and dispersion modelling with measurements at a few sites.
In the street environment, measurements are performed near the building line and no
more than 5 meters from the carriageway. The pollution at street sites is defined by the
traffic characteristics (traffic density and composition, average speed etc.), the
buildings or other obstacles along the street and the orientation of the street. Sites
along highways through unbuilt and non sensitive areas are not relevant.
Measurements should be carried out at selected typical zones and a total description of
the exposure, e.g. of inhabitants should be carried out by model calculations.
For management purpose it is recommended that O3 and NO should be measured in
addition to NO2 at both rural and urban background sites in order to describe the
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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
français: DIS CUS DES RAD