Validate and quantify the benefits of introducing air purification technologies in buses

In this study, we are looking to assess how well portable air purifiers improve air quality in buses. We will monitor the concentrations of major pollutants both inside and outside the test bus, including particulate matter (PM2.5, PM10), CO2, CO, NO2, SO2, and TVOCs. Ventilation mode will be varied to evaluate how well portable air purifiers clean air under different ventilation conditions.