Center for Environmental Science in Saitama
PM2.5 sequential sampler(2025i) was installed at the first building of Mt.Fuji meteorological station and daily collected PM2.5 on filter in order to clarify transboundary pollution of PM2.5
in East Asia.Sampling was carried out during a month from July 21 and with Beijing, Shanghai in China, Jeju in South Korea and Shinjuku and Kazo in Japan during two weeks in August
simultaneously.Filters were treated based on reference method of PM2.5 measurement.
Trend of PM2.5 mass concentration was shown in Fig.1. Average concentration was 2.6±1.8 μg/m3. The highest concentration was 7.3 μg/m3 on August 11 and the second highest was 6.3 μg/m3 on August 8.
These were well accorded with the date of increase of SO2 measured by Prof. Kato. Backward trajectories showed that mass of air inflowed from the north direction especially north east China on August 8.
On the other hand, 2.6-2.8 μg/m3 of PM2.5, comparatively lower were observed on August 6, 9 and 10. Trajectories showed air mass inflowed from the Pacific ocean or Kanto region. We will measure chemical components such as water soluble inorganic ions and metal elements focused on them.