The deposition of nitrogen and the photochemical oxidants is not only a local but also

a transboundary air pollution problem. In order to decrease the transboundary

pollution effects caused by NOx emission, a freezing of the emissions was adopted

within UNECE, i.e. the NOx protocol to the Convention on Long Range Transport Air

Pollution. The setting of new limits for urban air quality of NO2 will lead to emission

reductions which are also necessary for protection of the ecosystems from nitrogen

deposition exceeding critical loads.

 

In the absence of indoor sources the indoor concentrations are 30 to 100% of the

outdoor concentrations. For NO2, additional indoor contributions may occur from gas

fuelled stoves, ovens and water heatersand smoking. These contributions may be

considerable in relation to the outdoor pollution and must be considered from a total

health assessment point of view. As mentioned in the "scope" section of this

document, indoor pollution is not the object of this position paper.

 

 

 

 

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deutsch: DIS CUS  DES  RAD

castellano: DIS CUS DES  RAD   english: DIS CUS DES RAD  

 

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français:  DIS CUS DES RAD