N_URB1. Likewise, the minima concentrations in N_URB3 were
observed in the LR; nevertheless, in N_URB2, the LR had higher
concentrations than the other measured rooms. Minima concentrations
were always found during weekends or periods of nonoccupancy
and maxima concentrations were always registered
during occupancy periods, as can be observed on Figs. 3e7. Table 2
showed that median values were very close to mean values, so
there was not great scattering in the measurements in each room.
The only exception was registered in PMTotal, in which mean concentrations
were in general higher than median values.