Evaluating the results obtained from monitoring were taken into account two important issues: the limit established by the American Conference of Industrial Hygienists (ACGIH) of 0.37 mg/m3 [9] as a Treshold Ceiling Limit Values (TLV-C) (it is a “threshold” value, which should not be exceeded even for an instant); the World Health Organization has set a threshold of air quality for formaldehyde of 0.1 mg/m3 (on 30 minutes of sampling) in indoor environments specifying that a concentration of 0.3 mg/m3 causes a significant increase in the irritant effects in healthy subjects.