2018 Volume 53 Issue 4 Pages 144-152
An increase in the PM2.5 and photochemical oxidant concentrations was observed in the Kanto area in the summer of 2015. A PM2.5 sequential sampler was installed at the Fuji meteorological station located in the free troposphere. We carried out daily PM2.5 samplings for 31 days from July 21 to August 20 at the top of Mt. Fuji in order to evaluate the air pollution including the free troposphere. We measured the elements in the PM2.5 samples and compared them with those at Kazo, Japan.
PM2.5 collected at the top of Mt. Fuji had elements that originated from the topsoil of Mt. Fuji and some elements that originated from anthropogenic sources were enriched. We calculated the ratio of arsenic (As), an indicator of coal combustion to vanadium (V), an indicator of oil combustion at Mt. Fuji and Kazo, and found that the ratio had obviously increased in some periods at Mt. Fuji or both sites. This indicated that long-range transportation had contributed to the increase of PM2.5 concentration in the Kanto area in the summer of 2015.
