| Abstract: | CONCLUSION. The effects of air pollutants, SO2, NOX and O3, on natural deterioration of paper materials was demonstrated in a 8-years study combining measurements of material properties and analyses of indoor air quality. We can conclude that there is a measurable positive effect of air purification. The classical analytical methods we applied in our research yielded satisfactory data although interpretation was not straightforward. This was due to the relatively short duration of the study leading to small differences in the measured properties. However, the importance of a well-defined experimental set-up should be stressed. The NOAEL value (no observed adverse effect level) for a well-purified storage room has been estimated at 15 ppb, thus the annual cumulative dose of NOX in a storage room should not exceed 15 ppb. This is more than 40% lower than the currently valid guideline in the Dutch Archives Act, which is 25 ppb NOX. |
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