ventilation

Friends and colleagues:

I am looking for any data of ventilation rates in residential high-rise
buildings, and possible radon in them, for a literature review and short
paper.

I have two studies now, by Tom Pugh of FL A&M (5 buildings, 5 units) and
Bill Brodhead working in NC (1 building, 5 units). They both show low
ventilation and elevated radon levels in units above the 3rd floor. The
source is likely to be concrete, but I'd like to find more data.