Number of location and measurement for a reliable microbiological air testing

The people involved in a daily microbiology air sampling activity know quite well the frequent difficulties to obtain reliable results even in the same closed environment where the conditions are constant. The reasons are several: uneven distribution of micro-organisms in the air, inconstant biological activity of micro-organisms, influence of operator, air sampler, media, etc. The goal is to obtain results that are comparable with the previous data.
