I work in a very old building and sit right next to an inside rock wall. We have many exposed rock walls within the office. All office furniture is constantly covered in this "dust" that looks like the mortar from rock wall. I have developed some allergies in my older age of 62, but it has progressively gotten worse through the years until now I also have bouts with astnhma. I have worked here 14 yrs now and am beginning to think that this mortar dust that I have been breathing may have something to do with all of my breathing problems, or at least, has not helped the situation.