Urban and rural transport of semivolatile organic compounds at regional scale: A multimedia model approach

Urban-rural gradients of polycyclic aromatic hydrocarbons in soils at a regional scale: Quantification and prediction

“…Cities could be regarded as major sources of PAHs, PCBs and other POPs to the rural regions, which was reflected in huge differences in contaminant emissions between urban and rural areas. Lots of studies on POPs concentrations in different media were reported, but little was studied about POPs behavior between urban and rural areas at a regional scale 2 . Quantitative studies on urban and rural concentrations of pollutants mainly focus on those in atmospheric media using ratios of urban to rural concentrations 12,29,30 .…”

“…The fate of persistent organic pollutants (POPs) has brought great concern from considerable government officials and scientists, particularly when local emission of chemicals has resulted in dispersed contamination of large areas 1 be several times or even thousands of times higher than that in suburbs, which may result in POPs concentrations in urban soils several times or even tens of times higher than that in rural soils 2,3 . However, little work was relevant to quantitative spatial distribution of POPs soil concentrations between urban and rural regions at a regional scale 4,5 .…”

“…One is that a few representative studies about POPs transport simulation between urban and rural regions using fugacity model. For example, Multimedia Urban Model (MUM) and Spatially Oriented MUM (SO-MUM) were used to simulate the fate of POPs from urban to suburban in Canada 4,6,7 ; the Berkeley-Trent-Urban-Rural Fate Model (BETR) was provided for Switzerland to investigate the origin of PCBs in air and to investigate their long-term fate and mass balance in the environment 5 ; the spatially resolved Berkeley-Trent-Urban-Rural Fate Model (BETR-UR) was designed by coupling land cover information to simulate the transport of POPs between urban and rural areas 2 . The other method is that the analysis of numerous measured data through systematic description 8,9 or some classic atmospheric transport models 10 .…”

“…In this paper, measured data of PAHs, PFASs and PCBs were used to study the concentration gradients of POPs between urban and rural areas. We will (1) first outline the potential factors affecting the spatial distribution and accumulation of POPs; (2) quantitatively describe what are the urban-rural gradients in the study area through theoretical analysis (formula deduction) and validation of measured data; 3…”

Analysis and Implementation of Intelligent Commuter Bus System and Its Application Perspectives

“…Reasonable intelligent commute bus routes and site design not only have a positive impact on employee satisfaction but also have an active and complementary role in urban transport [4]. In the current era of the Internet and the mobile Internet, how to use Internet thinking to create a "car networking" [5].…”