Daily Continuous Evaluation of Carbonaceous and Inorganic Ion Components of PM<sub>2.5</sub> in Nagakute, Aichi: Trends in Annual Mean Values from FY 2004 to FY 2014 and Features of Components in Extremely High Mass Concentration of PM<sub>2.5</sub>

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  • 愛知県長久手市におけるPM<sub>2.5</sub>中の炭素成分と無機イオン成分の日毎連続測定―2004年度から2014年度の平均値の経年変化と高濃度時の特徴―
  • 愛知県長久手市におけるPM₂.₅中の炭素成分と無機イオン成分の日毎連続測定 : 2004年度から2014年度の平均値の経年変化と高濃度時の特徴
  • アイチケン ナガクテシ ニ オケル PM ₂.₅ ナカ ノ タンソ セイブン ト ムキ イオン セイブン ノ ヒゴト レンゾク ソクテイ : 2004ネンド カラ 2014ネンド ノ ヘイキンチ ノ ケイ ネンヘンカ ト コウノウドジ ノ トクチョウ

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Abstract

<p>The daily concentrations of the PM2.5 components were measured from fiscal year (FY) '04 to '14 at a suburban roadside site in Nagakute. The annual means of the PM2.5 mass concentration tended to decrease during the observation period, and the decreasing rate became lower after FY '10. The OC and SO42- indicated higher annual mean concentrations than the other components of PM2.5, suggesting the importance in the decrease of both components for improvement of the annual mean PM2.5 concentration. The annual mean concentration of the EC showed a downward trend from FY '04 to FY '09, and it is considered that the substitution effect of diesel cars to newly regulated vehicles is the main factor. On the other hand, from FY '09 to FY '14, the EC moderately declined, and the substitution effect became lower. The annual mean concentrations of the OC, which were higher than the EC, showed a temporal variation similar to the EC from FY '04 to FY '07. However, from FY '07 to FY '10, the mean concentrations of the OC rarely varied in spite of the decrease in the mean concentrations of the EC. The means of the main component (EC, OC, SO42-, NO3-, NH4+) concentrations of 5% days for the PM2.5 ranking of the highest, medium and lowest were evaluated for each FY. The ratio of SO42- of the highest rank was higher than the other ranks in each FY, which revealed the importance of measures to lower the SO42- concentrations for decreasing the 98 percentile value from the lowest daily concentration of PM2.5.</p>

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