Within the UNECE Integrated Co-operative Programme on Materials a large number

of exposure sites have been set up, where pollution concentrations and material

deterioration rates are measured. The programme aims to quantify the effect of SO2 in

combination with NO2 and other pollutants. So far no results are available that clarify

the role of NO2. The main reason being SO2 and NO2 tend to be both present in urban

air. However, the ratio of nitrogen to sulphur oxides is increasing at many sites, and.

this may mean nitrogen oxides may exert a more substantial effect on material damage

in the future.

At present there is not sufficient data to enable a recommendation to be made for an

air quality limit value for NO2 in order to protect material from air pollution damage.

 

 

 

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