~~3 53B0D8 (Continued) Dr. Eolden must have done this, perhaps some of the othe the old days out of curiosity I used to take dust sanple after rainstores and a lot of dust present is almost 1 covpared with what is ordinarily present, particularly 1 air. There was so little that it has always been wy ir: tiat for all practical rurroses under certain conditions scavencing effect is 100%, But you don't know if it is the same air that you are de with. Lif -NBODs No, that is right. It is probably more.corplicated than HOLZKANS he noticed that with the onset of rain he got almost a tegrifie increase in ths background and then it fell off eharrly. | inplied that thas it wae 100% effective in scavenging, of this doeen't say mich about what was left in tha air but RAP?’ s the small stuff would get down much more slowly. AULA ANS fut, to centinus on -iaenbud's theme, there are many, ma! documented cases of rainfall, muddy rainfall and brown sn appearing with a whole host of particle sizes all the way to very small amcunts, and gives one, at least from the rekeor-< efogteal point of vies t it aust be a very effective