| Title | The Impact of Traffic Environmental Characteristics at Intersections on Air Quality and the Development of Improvement Guidelines (1/2) - Survey Plan and Data Collection |
| Dept | Transportation Energy and Environment Division |
| Year | 2025 |
| Month | 2 |
| Price | 180 |
| Summary | The purpose of this project is to collect domestic and international literature on traffic-related air pollution and vehicle emission dispersion at intersections to understand the impact of vehicles and the environment on air quality. The project aims to develop a plan for collecting traffic, environmental, and air pollution data, improve the quality of the investigation plan through expert consultations, and conduct field data collection and air pollution measurements at intersections based on the formulated plan. The collected data will be analyzed and summarized to identify key factors affecting air pollution at intersections, serving as a basis for analysis and evaluation in the second year of the project. This project compiled relevant literature on the impact of intersection traffic characteristics on environmental exposure, both domestically and internationally. The results showed that in addition to seasonal and weather effects, traffic signal control and geometric design at intersections are significantly associated with air quality. Therefore, this year's study focuses on intersections with “exclusive pedestrian phases” and “setback pedestrian crossings” as the primary subjects for investigation and planning. The project conducted surveys at four intersections in Taipei City, collecting traffic volume, PM2.5, and CO concentration data for four days at each site, with 12 hours of monitoring per day. The findings indicate that at intersections with exclusive pedestrian phases, there is no consistent pattern in PM2.5 concentration changes when the pedestrian phase is activated or deactivated. At intersections with setback pedestrian crossings, the pedestrian waiting areas are located farther away from the motorcycle waiting zones and lateral traffic flows. As a result, the average PM2.5 concentration in the setback areas is slightly lower compared to the areas before the setback. Considering that intersections are micro-environments, short-term monitoring is only suitable for capturing instantaneous pollution changes at specific locations. It is recommended that future studies incorporate simulation models to estimate pollutant dispersion, enhancing the understanding of the impact of traffic characteristics on air pollution. |
| Post date | 2025/02/28 |
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