I've also read that the more tightly constructed, well-insulated modern houses have also contributed to the increasing prevalence of asthma. Any thoughts?
It seems pretty clear that the increase in asthma and the increase in the number of these buildings occurred during the same time period. Evidence of a direct causal link is not yet available.
I think that's just one of many theories. I've also heard that with today's working parents/latchkey kids, there's nobody really cleaning the home any more and that is contributing to the apparent increase in asthma cases as well. My asthma only occurs when I'm around cats for extended periods of time - and even then, if the ventilation and filtration is adequate, it doesn't bother me.
I'm not "restorer",but I'd be willing to bet money on it. It's not just the fact that the houses are so much more airtight today. It's also the more modern materials being used in them that is causing problems. If you don't believe me,all you have to do is go into a new home or office that has all new cabinets,nylon carpets,moulding,etc in it that has been shut up all weekend in warm weather,and the chemical smell is enough to knock you down.
ANYBODY out there who has small children needs to get rid of your nylon carpet NOW. In MY opinion,this is the one thing most responsible for the high number of children today who have respirority diseases such as asthma. Remember the smell I wrote about above? Your children are MUCH closer to this than you are,and are more sensitive to it. There is also the fact that all carpet collects all the moisture and "trash" from the bottom of your shoes when you come in the house,and the carpet will stay moist all day from wet shoes. Get throw rugs you can wash in your washing machine,and get rid of the carpets.