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<p>The quantitative relationship between the observed snowfall and PM<sub>2.5</sub> concentration data collected at Niigata Prefecture, Japan, was examined. The PM<sub>2.5</sub> concentration decreased as snowfall increased. A composite analysis revealed that the PM<sub>2.5</sub> concentration decreased by 27.33% from 1 h before to 1 h after the onset of snowfall, which is statistically significant. The average PM<sub>2.5</sub> concentration for all snowfall events decreased over a total of three hours, from 2 h before to 1 h after the onset of snowfall. The average PM<sub>2.5</sub> scavenging rate for all snowfall events was 6.15 × 10<sup>−6</sup> s<sup>−1</sup>, which was much higher than that for rainfall events. The scavenging rates were positive at relative humidity (RH) between 50% and 75% and above 95%. It is suggested that the deposition processes of wet scavenging are effective, both in reducing PM<sub>2.5</sub> concentration during snowfall and in the RH dependence of scavenging rates.</p>

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PM 2.5 Concentration Decreases with Snowfall as Revealed by Surface Observation Data

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年1月1日

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  • Risako Fujino,
  • Yoshiaki Miyamoto,
  • Takato Kiryu

摘要

The quantitative relationship between the observed snowfall and PM2.5 concentration data collected at Niigata Prefecture, Japan, was examined. The PM2.5 concentration decreased as snowfall increased. A composite analysis revealed that the PM2.5 concentration decreased by 27.33% from 1 h before to 1 h after the onset of snowfall, which is statistically significant. The average PM2.5 concentration for all snowfall events decreased over a total of three hours, from 2 h before to 1 h after the onset of snowfall. The average PM2.5 scavenging rate for all snowfall events was 6.15 × 10−6 s−1, which was much higher than that for rainfall events. The scavenging rates were positive at relative humidity (RH) between 50% and 75% and above 95%. It is suggested that the deposition processes of wet scavenging are effective, both in reducing PM2.5 concentration during snowfall and in the RH dependence of scavenging rates.