Diurnal trends of indoor and outdoor fluorescent biological aerosol particles in a tropical urban area

We evaluated diurnal trends of size-resolved indoor and outdoor fluorescent biological airborne particles (FBAPs) and their contributions to particulate matter (PM) within 0.5–20 μm. After a ten-week continuous sampling via two identical wideband integrated bioaerosol sensors, we found that both indoor and outdoor diurnal trends of PM were driven by its bioaerosol component. Outdoors, the median [interquartile range] FBAP mass concentration peaked at 8.2 [5.8–9.9] μg/m3 around sunrise and showed a downtrend from 6:00 to 18:00 during the daytime and an uptrend during the night. The nighttime FBAP level was 1.8 [1.4–2.2] times higher than that during the daytime. Indoors, the rise in concentrations of FBAPs smaller than 1 μm coincided with the starting operation of the heating, ventilation, and air conditioning (HVAC) system at 6:00, and the concentration peaked at 8:00 and dropped to the daily average by noontime. This indicated that the starting operation of the HVAC system dislodged th...

本研究针对粒径范围为0.5~20 μm的室内外荧光生物气载颗粒（fluorescent biological airborne particles, FBAPs）的昼夜变化规律及其对颗粒物（particulate matter, PM）的贡献进行了评估。通过两台相同的宽带集成生物气溶胶传感器开展为期十周的连续采样后，我们发现室内外颗粒物的昼夜变化规律均由其生物气溶胶组分主导。户外环境中，荧光生物气载颗粒的质量浓度中位数[四分位间距]为8.2[5.8~9.9] μg/m³，在日出前后达到峰值；日间6:00至18:00浓度呈下降趋势，夜间则呈上升趋势，夜间FBAP浓度较日间高出1.8[1.4~2.2]倍。室内环境中，粒径小于1 μm的荧光生物气载颗粒浓度上升与6:00时供暖、通风与空调（heating, ventilation, and air conditioning, HVAC）系统启动同步，浓度于8:00达到峰值，并在午间降至日平均水平。这表明HVAC系统启动时会驱散……