S. Wakamatsu

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Fog is a meteorological/environmental phenomenon which happens across the Indo-Gangetic Plains (IGP) and leads to significant social and economic problems, especially posing significant threats to public health and causing disruptions in air and road traffic. Meteorological stations in Pakistan provide limited information regarding fog episodes as these(More)
1 Molina Center for the Energy and the Environment (MCE2), La Jolla, CA, USA 2 Department of Earth, Atmospheric and Planetary Sciences, Massachusetts Institute of Technology, Cambridge, MA, USA 3 Centro Nacional de Investigación y Capacitación Ambiental del Instituto Nacional de Ecologı́a (CENICA-INE), D.F., México 4 Japanese International Cooperation(More)
The number concentration and number size distributions of ultrafine particles were measured with a Scanning Mobility Particle Sizer (SMPS) at a roadside in early autumn and winter, and the results are discussed with regard to the contribution of traffic activity and meteorological conditions. The number concentration of the <50 nm fraction increased in the(More)
The impact of manufacturing transfer in Jiangsu province, China, on the spatial-temporal variations of SO2 emissions is investigated using estimated sector-specific SO2 emissions, and emissions in the different transfer-in and transfer-out regions were quantified during 2000–2011. Our results show that SO2 emissions had undergone three phases: an increase(More)
The surface area of ambient aerosols can be considered as an index of toxicity because an increased surface area may be able to act as a catalyst for specific reactions between particles and cells, as well as a carrier for co-pollutants, such as gases and chemicals. The aerosol surface area concentration was measured together with black carbon (BC) and(More)
To understand the influence of trans-boundary air pollution on the air quality of Fukuoka, the mass concentration and chemical composition of fine particulate matter (PM) were observed at urban (Fukuoka) and rural (Fukue Island) sites in the northern Kyushu area in Japan. Chemical composition was measured using an aerosol mass spectrometer. Organic aerosol(More)
Data from the annual, seasonal, and hourly behavior of the criteria air pollutants CO, NO2, SO2, O3, and PM10 in three Mexican metropolitan areas (the Mexico City Metropolitan Area (MCMA), Guadalajara Metropolitan Area (GMA), and Monterrey Metropolitan Area (MMA)) over the period 2000–2011 were analyzed; and compliance with Mexican air quality standards was(More)
Isao Kanda 1,2,*, Roberto Basaldud 3, Miguel Magaña 3, Armando Retama 4, Ryushi Kubo 5 and Shinji Wakamatsu 1 1 Faculty of Agriculture, Ehime University, 3-5-7 Tarumi, Matsuyama, Ehime 7908566, Japan; wakamatu@agr.ehime-u.ac.jp 2 Japan Meteorological Corporation, 2-7-6 Saiwaicho, Naniwa, Osaka, Osaka 5650021, Japan 3 National Institute of Ecology and(More)
The Japan Oceanographic Data Center has been submitting oceanographic data to the World Data Center)for oceanography through the framework of the International Oceanographic Data and Information Exchange committee sponsored by the UNESCO/IOC. In the World Ocean Database 2009 which is the compiled database of WDC for oceanography, the Japanese contribution(More)
Measurements and receptor modeling of volatile organic compounds in south-eastern Mexico City, 2000–2007 H. Wöhrnschimmel, M. Magaña, W. A. Stahel, S. Blanco, S. Acuña, J. M. Pérez, S. González, V. Gutiérrez, S. Wakamatsu, and B. Cárdenas Instituto Nacional de Ecologı́a, Mexico City, Mexico Institute for Chemical and Bioengineering, ETH Zurich, Switzerland(More)