During the summer of 2018, we monitored the concentrations of water-soluble acid gases and particulate anions at the southeastern foot (1284 m a.s.l.) of Mt. Fuji, Japan, using gas/particle-ion chromatographs. All samples analyzed contained quantifiable levels of anions. The average concentrations of acid gas and particulate anion concentrations were, respectively, 1.10 ±0.37 nmol m–3 for HCl, 3.49±1.72 nmol m–3 for HONO, 1.23±0.59 nmol m–3 for HNO3, 0.33 ±0.20 nmol m–3 for SO2, 3.61±3.69 nmol m–3 for Cl–, 0.65±0.22 nmol m–3 for NO2–, 4.29± 2.98 nmol m–3 for NO3–, and 4.47±3.57 nmol m–3 for SO42–. We found that the concentration of soluble acidic gases increased during the daytime, while no characteristic diurnal patterns were observed in the particulate anions.
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