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- W4212801460 abstract "To increase our knowledge of PM 2.5 concentrations near the surface in a forest park in Beijing, an observational study measured the concentration and composition of PM 2.5 in Beijing Olympic Forest Park from 2015 to 2016. This study analyzed the meteorological factors and removal efficiency at 1.5 m above the ground (human breathing height) over the course of the day in the forest. The results showed that the average concentrations of PM 2.5 near the surface peaked at 07:00–09:30 and reached their lowest at 12:00–15:00. In addition, the results showed that the annual concentration of PM 2.5 in the forest was highest during winter, followed by spring and fall, and was lowest during summer. The main chemical components of PM 2.5 near the surface in the forest were SO 4 2− and NO 3 − , which accounted for 68.72% of all water-soluble ions that we observed. The concentration of PM 2.5 in the forest had a significant positive correlation with relative humidity and a significant negative correlation with temperature. The removal efficiency near the surface showed no significant variation through the day or year. In the forest, the highest removal efficiency occurred between 07:00 and 09:30 in summer, while the lowest occurred between 09:30 and 12:00 in winter." @default.
- W4212801460 created "2022-02-24" @default.
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- W4212801460 date "2019-07-10" @default.
- W4212801460 modified "2023-10-16" @default.
- W4212801460 title "Understanding PM2.5 concentration and removal efficiency variation in urban forest park — Observation at human breathing height" @default.
- W4212801460 doi "https://doi.org/10.7287/peerj.preprints.27846v1" @default.
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