Analysis of Indoor Formaldehyde Pollution in Mechanical Fresh Air System Residential Buildings in Liaoning Area in Winter

The conditions for opening windows in winter in Liaoning area are limited, and ventilation is an effective mean to solve the problem of excessive formaldehyde concentration in indoors. In order to analyze the status of formaldehyde pollution in the winter of mechanical fresh air system residential buildings, 8 households with fresh air system in Liaoning area were selected to obtain indoor formaldehyde concentration changes by using formaldehyde indoor detection on typical meteorological days and long-term dynamic online monitoring in winter. According to the analysis of the indoor measured data under the closed condition and the mechanical ventilation condition and long-term online monitoring data of the 8 households with mechanical fresh air system, it is found that the indoor formaldehyde concentration can be reduced to some extent by opening the fresh air system. Compared with the macroscopic effect of 21 naturally ventilated houses tested in the same way, the average indoor formaldehyde concentration of the houses using mechanical fresh air system was 14.3% lower, providing a reference for the winter ventilation mode in Liaoning area.