Track topics on Twitter Track topics that are important to you
Urban air pollution features large spatial and temporal variations due to the high heterogeneity in emissions and ventilation conditions, which render the pollutant distributions in complex urban terrains difficult to measure. Current urban air pollution models are not able to simulate pollutant dispersion and distribution at a low computational cost and high resolution. To address this limitation, we have developed the urban terrain air pollution (UTAP) dispersion model to investigate, at a spatial resolution of 5 m and a temporal resolution of 1 h, the distribution of the local traffic-related NO concentration at the pedestrian level in a 1 × 1 km area in Baoding, Hebei, China. The UTAP model was shown to be capable of capturing the local pollution variations in a complex urban terrain at a low computational cost. We found that the local traffic-related NO concentration along or near major roads (10-200 μg m) was 1-2 orders of magnitude higher than that in places far from roads (0.1-10 μg m). Considering the background pollution, the NO and NO concentrations exhibited similar patterns with higher concentrations in street canyons and lower concentrations away from streets, while the O concentration exhibited the opposite behavior. Sixty percent of the NO concentration likely stemmed from local traffic when the background pollution level was low. Both the background wind speed and direction substantially impacted the overall pollution level and concentration variations, with a low wind speed and direction perpendicular to the axes of most streets identified as unfavorable pollutant dispersion conditions. Our results revealed a large variability in the local traffic-related air pollutant concentration at the pedestrian level in the complex urban terrain, indicating that high-resolution computationally efficient models such as the UTAP model are required to accurately estimate the pollutant exposure of urban residents.
This article was published in the following journal.
Name: Environmental pollution (Barking, Essex : 1987)
Previous studies have suggested that dynamical downscaling to global climate models can produce improved climate simulations at regional and local scales. However, the expensive computational requirem...
An electron optical column has been designed for High Resolution Electron Energy Loss Microscopy (HREELM). The column is composed of electron lenses and a beam separator that are placed between an ele...
This study evaluates the daily exposure of urban residents across various commuting modes and destinations by intersecting data from a travel survey with exposure surfaces for ultrafine particles and ...
Quantification of the angular orientation distribution of fibrous tissue structures in scientific images benefits from the Fourier image analysis to obtain quantitative information. Measurement uncert...
Coating load and distribution in gas diffusion layers (GDLs) for polymer electrolyte fuel cells (PEFCs) have a major influence on mass transport losses. To be able to optimize the coating distribution...
Main objectives: - To know the distribution of risk elements of traffic injuries Secondary objectives: - To study the distribution of risk elements related with the possibil...
Driving a car is the most dangerous behavior most people engage in every day. According to the World Health Organization, about 1.25 million people die each year as a result of road traffi...
This study aims to assess the effects of acute exposure to traffic-related air pollution and the underlying mechanisms.
This study aims to better understand the dispersion of local anesthetic on the Erector Spinae Block, a new technique developed for analgesia. It consists on injection of local anesthetic a...
The aim of this observational study is to compare the visual interests between residents in high-fidelity simulation practice
A computer simulation technique that is used to model the interaction between two molecules. Typically the docking simulation measures the interactions of a small molecule or ligand with a part of a larger molecule such as a protein.
Accidents on streets, roads, and highways involving drivers, passengers, pedestrians, or vehicles. Traffic accidents refer to AUTOMOBILES (passenger cars, buses, and trucks), BICYCLING, and MOTORCYCLES but not OFF-ROAD MOTOR VEHICLES; RAILROADS nor snowmobiles.
A computer simulation developed to study the motion of molecules over a period of time.
The method of measuring the dispersion of an optically active molecule to determine the relative magnitude of right- or left-handed components and sometimes structural features of the molecule.
A controlled learning environment that closely represents reality.