As can be seen, from the values reported in the Table 1, also the highest concentration detected falls in the range of values of threshold for the perception of odours (0.06 - 1.2 mg/m3 ) and the threshold for eyes irritation (0.01 - 1.9 mg/m3 ). We can also observe a random distribution of formaldehyde’s concentrations emitted from the laser printer in study, Figure 2.