Temperature (C) and relative humidity (%, RH) were
measured using TinyTags (Gemini Data Loggers, UK), which were
placed in the living rooms. The TinyTags were set to measure in a
continuous mode giving the average in ten-minute intervals.
Perfluorocarbon tracer-gas method (PFT) was used to measure
the air exchange rates (AER, h1) in the dwellings. The dwellings
were treated as single zones. Details of the PFT technique
including analysis of tracer gases have been described previously
[7]. The uncertainty of single-zone tracer-gas measurements is
below 20%.