Difference in concentration trends of airborne particulate matter during rush hour on weekdays and Sundays in Tokyo, Japan
Difference in concentration trends of airborne particulate matter during rush hour on weekdays and Sundays in Tokyo, Japan
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日本东京工作日与周日高峰时段空气颗粒物浓度变化趋势
DOI：
10.1080/10962247.2014.923060
复制
发表时间：
2014
影响因子：
2.7
通讯作者：
E. Yano
中科院分区：
文献类型：
--
作者：
K. Hara;Junichi Homma;K. Tamura;Mariko Inoue;K. Karita;Y. Kondo;E. Yano
过去十年来，日本东京的悬浮颗粒物和细颗粒物(小于或等于2.5PM2.5)总体上呈下降趋势。为了阐明这一下降的主要原因，作者调查了空气中颗粒物(SPM和PM2.5浓度)的不同趋势，方法是根据监测站的位置(路边与周围环境)、一周中的几天(工作日与周日)以及每日波动模式(2002年与2010年)进行比较。在日本东京的四个监测站(两个路边监测站，两个环境监测站)获得了SPM和PM2.5的小时平均浓度。计算了2002年至2010年一周中每一天和一天中每小时的年平均浓度。结果显示：(1)只有两个路边监测站的年平均浓度的日差异在2010年有所减少；(2)两个路边监测站在平日每日繁忙时间所观测到的高小时平均浓度在2010年有所减少；(3)自2002年以来降幅最大的SPM浓度是PM2.5浓度；以及(4)两个路边监测站在工作日的小时平均浓度波动减小。自2002年以来，日本东京平日路边监测站的空气悬浮颗粒物在每日繁忙时间呈下降趋势。PM2.5浓度的下降导致了工作日每日高峰期间空气颗粒物浓度的下降趋势，这表明柴油车产生的排放较少。作者根据地点(路边与环境)、一周中的几天(工作日与周日)以及日波动模式(2002年与2010年)比较了东京SPM和PM2.5的趋势。2002年在工作日高峰时间在路边观察到的每小时平均浓度较高的情况在2010年有所减少。高峰时段降幅最大的是PM2.5。PM2.5浓度的显著下降导致了工作日高峰时段SPM浓度的总体下降趋势，这表明柴油车产生的排放较少。
Suspended particulate matter (SPM) and fine particulate matter (less than or equal to 2.5 μm: PM2.5) have generally been decreasing for the last decade in Tokyo, Japan. To elucidate the major cause of this decrease, the authors investigated the different trends of airborne particulates (both SPM and PM2.5 concentrations) by evaluating comparisons based on the location of the monitoring stations (roadside vs. ambient), days of the week (weekdays vs. Sundays), and daily fluctuation patterns (2002 vs. 2010). Hourly mean SPM and PM2.5 concentrations were obtained at four monitoring stations (two roadside stations, two ambient stations) in Tokyo, Japan. Annual mean concentrations of each day of the week and of each hour of the day from 2002 to 2010 were calculated. The results showed that (1) the daily differences in annual mean concentration decreased only at the two roadside monitoring stations; (2) the high hourly mean concentrations observed on weekdays during the daily rush hour at the two roadside monitoring stations observed in 2002 diminished in 2010; (3) the SPM concentration that decreased the most since 2002 was the PM2.5 concentration; and (4) the fluctuation of hourly concentrations during weekdays at the two roadside monitoring stations decreased. A decreasing trend of airborne particulates during the daily rush hour in Tokyo, Japan, was observed at the roadside monitoring stations on weekdays since 2002. The decreasing PM2.5 concentration resulted in this decreasing trend of airborne particulate concentrations during the daily rush hours on weekdays, which indicates fewer emissions were produced by diesel vehicles. Implications The authors compared the trends of SPM and PM2.5 in Tokyo by location (roadside vs. ambient), days of the week (weekdays vs. Sundays), and daily fluctuation patterns (2002 vs. 2010). The high hourly mean concentrations observed at the roadside location during rush hour on weekdays in 2002 diminished in 2010. The SPM concentration that decreased during rush hour the most was the PM2.5 concentration. This significant decrease in the PM2.5 concentration resulted in the general decreasing trend of SPM concentrations during the rush hours on weekdays, which indicates fewer emissions were produced from diesel vehicles.
影响因子：
5
作者：
K. Sasaki;K. Sakamoto
通讯作者：
K. Sasaki;K. Sakamoto
日本关东平原城市和郊区大气悬浮颗粒物和PM_<2.5>的日变化特征
DOI：
--
发表时间：
2006
期刊：
Water Air and Soil Pollution (印刷中)
影响因子：
--
作者：
Sasaki;K.
通讯作者：
K.