Introduction
Experimental set up
Results
　Mass control
　X-ray diffraction analysis
　Elutes
　　Exposure in SO2 contaminated atmosphere
　　Exposure in a NO2 and O3 contaminated atmosphere
　　Exposure in SO2-NOx-O3 contaminated atmosphere
　Sulphate
　Nitrate
Discussion
　Comparison of the data of the NO2-O3 and SO2-NO2-O3-systems
　Some observations with respect to the NO2 component
　Prognosis of deposition

『Conclusion
　The present study has shown that the method to expose carbonate materials in atmospheres o realistic concentration contents of SO2, NO2 and O3 leads to the formation of deposition products. The results are qualitatively comparable with the findings of other studies where gas concentration considerably above realistic immission levels were used in order to accelerate the decay for time saving reasons. Although our experiments require a time frame of several weeks, the time saved in the other accelerated experiments does not exceed one order of magnitude. The information about the initial stages of material damages obtained in our study is sufficient to be used for estimating the given immission situation inclusive the possibly resulting pollution damages to expect for materials.
　A particular emphasis in this work has been given to the thread emanating from NO2 pollution together with O3 and SO2. The data show that this component has to be rated a considerable damage factor, hardly to encounter as a solid mineral phase but amply present as solution on/in the sample material. Materials of chemical sensitivity and of porous structure are particularly affected. This seems specifically the case in the field of historic monuments, in particular for stone objects. However, the data also line out a given NO2 immission situation which may be related to traffic exhaust.
（以下略）』

References