東京都狛江市におけるPM_<2.5>質量濃度と無機イオン成分の経年変化 [in Japanese] Interannual Variability in PM_<2.5> Mass and Inorganic Ionic Components Measured in Komae, Tokyo [in Japanese]
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Concentrations of PM<SUB>2.5</SUB> mass and inorganic ionic components measured in Komae, Tokyo, from FY1998 to FY2005 are analyzed for studying the interannual variability. It is found that the mass concentration tends to decrease annually, and this tendency is pronounced in winter. It is considered from the comparisons with other studies in South Kanto that the decreasing tendency is a relatively large-scale phenomenon, and the PM<SUB>2.5</SUB> mass concentration is being uniformed in the area.<BR> Inorganic ionic species do not show such decreasing tendency in general. As a result, concentration ratios of secondary inorganic aerosol (SIA) to PM<SUB>2.5</SUB> mass tend to increase. This could lead to the uniformity in PM<SUB>2.5</SUB> mass concentration. The SIA concentration is high, very close to the US Air Quality Standard for PM<SUB>2.5</SUB>. Therefore, the SIA should be more concerned in order to reduce the PM<SUB>2.5</SUB> mass concentration.
- Earozoru Kenkyu
Earozoru Kenkyu 21(4), 354-358, 2006-12-20
Japan Association of Aerosol Science and Technology