Site environments and instrumental characteristics of carbon dioxide (CO 2 ) measurements operated by local governments in the Kanto Plain, the center of which is Tokyo, were summarized for this study. The observation sites were classified into environments of three types: urban, suburban, and woodland. Based on a few decades of accumulated hourly data, the diurnal and seasonal variations of CO 2 concentrations were analyzed as a composite of anomalies from annual means recorded for each site. In urban areas, the highest concentrations appear before midnight in winter. The second peak corresponds to the morning rush hour and the strengthening of the inversion layer. Suburban areas can be characterized as having the highest concentration before dawn and the lowest concentration during the daytime in summer in association with the activation of respiration and photosynthesis of vegetation. In these areas, concentration peaks also appear during the morning rush hour. Woodland areas show background features, with the highest concentration in early spring, which are higher than the global background by about 5 ppmv.Atmosphere 2018, 9, 367 2 of 10 digital format to researchers for the region. Based on data observed during more than a decade, the diurnal and seasonal variations of CO 2 concentrations were analyzed to characterize site environments.

Site environments and instrumental characteristics of carbon dioxide (CO2) 9 measurements operated by local governments in the Kanto Plain, the center of which is Tokyo were 10 summarized for this study. The observation sites were classified into environments of three types: