One of the first steps taken to reduce pollution from formaldehyde was to standardize the emission from particleboard into three classes: E1, E2 and E3 (TABLE 12) [5,8]. However, acceptable levels of formaldehyde emission have been continuously reduced in Europe over the last years. The corresponding lower limit for MDF (for E1 class) is 7.0 mg/100g. For both particleboard and MDF formaldehyde emission, a correction of the perforator value to 6.5% board moisture content should be made.