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Variation of PM_2.5 through an Analysis of Components in Atmospheric Particulate Matter in Sanyo Onoda, Yamaguchi, Japan from FY 2013 to FY 2016

2018; Japan Society for Analytical Chemistry; Volume: 67; Issue: 6 Linguagem: Inglês

10.2116/bunsekikagaku.67.355

0525-1931

Hitoshi Asano, Yukihide Shiraishi,

Air Quality and Health Impacts

This paper describes the variation of the fine particulate matter (PM2.5) and inorganic ion components (SO42−, NO3−, NH4+, Na+, Cl−, K+, Mg2+, and Ca2+) concentrations in particulate matters (PMs) from March 2013 to February 2017 in Sanyo Onoda, Yamaguchi, Japan. The yearly mean PM2.5 mass concentration decreased from 21.2 μg m−3 to 17.0 μg m−3 in Sanyo Onoda, and a similar decreasing trend was observed in Japan. The yearly mean total mass concentration of ion components also decreased from 19.6 μg m−3 to 13.8 μg m−3. The major components of PMs were SO42−, NO3−, and NH4+, which accounted for 72-76 % of the total ion components mass concentration. The relationship of the equivalent concentrations between anions and cations was linear with a slope of 1.01 (r = 0.745). During this period, in Beijing, China, the yearly mean PM2.5 mass concentration decreased from 99.1 μg m−3 in FY2013 to 79.9 μg m−3 in FY2016. Moreover, the SO2 and NO2 vertical column density in Beijing was dramatically reduced. Based on these results, it is likely that the decreasing trends of PM2.5 and the major components in PMs in Sanyo Onoda were related to an improvement of the air quality in China.