Abstract
The way to grasp the comprehensive situation of indoor air contamination, it has been limited such as actual monitoring. The objectives of this study are 1) model construction to evaluate the formaldehyde indoor concentration by using macro material flows of plywood and adhesives, and 2) regulatory impact assessment about the reducing formaldehyde indoor air contamination by setting guideline value on contamination in 1997 and setting ventilation benchmarks in amended building standard act in 2003. Comparing with the actual monitoring formaldehyde concentration from 2000 to 2005 and 2006 to 2010, our estimation illustrated the good reproduction with the correlation of 0.91. However, our constructed model estimated 1.5 to 2.3 times larger than actual formaldehyde concentration. This is because the formaldehyde inflow we used were estimated by national report and the report assumed not to underestimate the formaldehyde inflow to the residual section for safety risk assessment. From the sight of the regulatory impact assessment, our long-term evaluation of formaldehyde concentration from 1970 to 2010 shows that the urea resin and melamine resin adhesive had been replaced with the phenol resin adhesive which includes less formaldehyde than urea/resin type just before 1997. Along with these replacements, formaldehyde inflows and concentrations has decreased.
