The effects of wind speed and wind angle on the PM2.5 removal efficiency using different protection window screens

Southern Taiwan is affected by monsoons during the winter and spring seasons resulting in high levels of PM2.5 exposure, further affects indoor air quality. Our study aims to investigate the effectiveness of different window orientations in actual residential settings for mitigating indoor PM2.5 levels by different types of protection window screen. Two buildings in southern Taiwan with windows facing different directions were selected and involving three types of protection window screens. The low-cost sensing (LCS) devices were used to monitor the indoor and outdoor PM2.5 levels. Opening windows with protection window screens could increase hour ratio of indoor PM2.5 lower than 15 μg/m3 in two residential and variations in PM2.5 clearance rates based on the orientation of windows with protection window screens. Additionally, the use of air purifier was found to further lower indoor PM2.5 concentrations. Subsequent analysis revealed that the influence of factors such as wind speed and wind angle can affect the effectiveness of protection window screens in reducing indoor PM2.5 levels. For windows facing different orientations in southern Taiwan, the wind angles and wind speeds generated by winter winds can influence the effectiveness of protection window screens in removing PM2.5 particles.