Journal of Japan Society for Atmospheric Environment / Taiki Kankyo Gakkaishi
Online ISSN : 2185-4335
Print ISSN : 1341-4178
ISSN-L : 1341-4178
Technical Report
Variable Factors Affecting Long-term Trend in Summertime High Ox Concentration and the Reduction Effect of the Precursors' Concentrations in Kanto Region
Hiroyuki Ueno Shinji SaitoKazuo Kokuryo
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Keywords: NMHC, VOC, NOx, Ox, Kanto region
JOURNAL FREE ACCESS

2015 Volume 50 Issue 6 Pages 257-265

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Abstract
The relationship between NMHC, NOx concentrations and Ox formation has been analyzed using the data observed during 1990–2011 in the Kanto region. The relationship seemed to be clearer by removing the effect of the meteorological conditions. It showed that the status of the Kanto region has been VOC-sensitive. The relationships between the precursor concentrations and Ox formation have varied according to the three periods showing the possibility that the change in the Ox measurement methods had been affected. The change in the VOC composition produced very little change in the reactivity although aromatic compounds had significantly decreased. According to the estimation using the occurrence ratios of high Ox concentration days, a 20% reduction of the NMHC concentration based on 2009–2011 average may cut in half the number of high Ox concentration days even if the NOx concentration decrease by 20%. The NMHC concentration should be reduced by 50% in order to reduce the number of high Ox concentration days to a zero level.
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© 2015 Japan Society for Atomospheric Environment
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