Evaluate the effect of the fresh air purification system on the improvement of indoor PM2.5 levels in a primary school classroom in Jinan City, Shandong Province. Our purpose is to explore the optimal operating time of the fresh air system and the main factors that affect the fresh air purification system to improve indoor air quality. From December 9, 2019 to December 10, 2019, two classrooms of the same area on the third floor of a primary school building in Jinan City, Shandong Province were selected as monitoring points. During the operation of the fresh air purification system, the PM2.5 concentration in the classroom is reduced by an average of 48.1%-61.5% compared to the outdoor PM2.5 concentration. After running for about 2 hours, the indoor PM2.5 concentration decreased to a relatively stable concentration level. The operating time of the fresh air purification system, student activities between classes, indoor temperature, indoor relative humidity, and outdoor PM2.5 concentration are important factors that affect the indoor particulate removal rate. In the case of a certain amount of fresh air and indoor area, closing doors and windows and appropriately extending the operation time of the fresh air purification system can improve the air quality in the classroom to a certain extent and protect the health of students.
于2019年12月9—10日，选取山东省济南市某小学教学楼三层的两个相同面积的教室作为研究现场，评估新风净化系统对室内PM2.5水平的改善效果，探讨新风系统运行的最优时长，以及影响新风净化系统改善室内空气质量的主要因素。新风净化系统运行期间，教室内PM2.5浓度相比室外PM2.5浓度平均降低48.1%~61.5%。运行2 h左右，室内PM2.5浓度降低至比较稳定的浓度水平。多重线性回归模型和混合效应模型结果均显示，新风净化系统运行时长、课间学生活动、室内温度、室内相对湿度以及室外PM2.5浓度是影响室内颗粒物去除率的重要因素。在新风量和室内面积一定的情况下，关闭门窗，适当延长新风净化系统运行时间，一定程度上可以改善教室内空气质量水平，保障学生的身体健康。.