Impact of Seasonal Trends and External Windows Structures on Both Indoor PM2.5 Pollution Level at Several Residential Buildings in Beijing, China
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This paper investigated the variation characteristics of ambient atmospheric PM2.5 and its influence on indoor environment, with considering several monitored residential buildings in Beijing, China. Conditions were considered for the room by air infiltration, with all the external windows closed and no indoor PM2.5 pollution sources. The constant monitoring of both outdoor and indoor PM2.5 mass concentrations was respectively made for one year from March 2016 to February 2017. Meteorological parameters were monitored simultaneously to be correlated with PM2.5 mass concentrations and indoor-outdoor concentration ratios. The results indicated: (1) Size of more than 90% of atmospheric particles were under 1 μm. (2) The monthly-average concentrations of outdoor and indoor PM2.5 tended to be highest in winter, followed by autumn, spring and summer. Additionally, the average I/O ratios in summer were lower compared to other three seasons. (3) PM2.5 mass concentration was significantly influenced by ambient wind speed and relative humidity. However, outdoor temperature played a negligible role in PM2.5 mass concentrations. (4) Better window airtightness will help to keep a high-demanded indoor environment by resisting atmospherics PM2.5 going indoors.
KeywordsFine particulate matter Air infiltration Seasonal trends and climate conditions Window structures Field measurement
This work was sponsored by the 13th Five-Year Key Project, Ministry of Science and Technology of China (No. 2017YFC0702800).
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