The limit values recommended in section 2 are proposed with the primary aim of

protecting human health. However, by reducing ambient air concentration of NO2

other benefits will be achieved such as reductions in material damage and

improvements in ecosystems. In urban areas the number of people exposed to high

peak concentrations and to high average exposures will decrease. Information on

health benefits are to expected to be estimated by WHO.

As seen from the risk assessment, there is no exposure - effect relationship for NO2

and materials available today. Consequently, there is insufficient evidence to quantify

the magnitude of damage (e.g. of cultural heritage) and thus the benefit of reductions

(as discussed by Mohr et al., 1997) .

 

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