ABSTRACT

Vehicle non-exhaust emissions are a major component of particle matter, including the direct wear of tires, brakes, road, and the resuspension of deposited particles. It is suggested that resuspended PM (RPM) emissions can be at the same magnitude or even larger than combustion emissions in urban centers. Factors affecting RPM can be included in four categories: road characteristics, traffic condition, land use, and meteorology. In order to study and evaluate these influencing factors, road dust less than 10 micrometers (RD10) was collected in 41 sites across Bogotá. The sampling points had diverse characteristics. RD10 levels varied between 1.0 and 45.8 mg/m² with an average of 8.9 ± 8.4 mg/m². Lower RD10 values were observed when vegetation density was high, pavement condition good, driving speeds fast and construction activities absent. On the contrary, RD10 increased under heavy-duty traffic influence and dry conditions. Among dust mitigation measures, management of land-use variables could be as important as traffic control and road maintenance.

Implications: This study documented for the first time in Latin America dust loadings less than 10 micrometers, information that can be used to estimate resuspended particle matter emissions in the region. The influence of meteorology, traffic characteristics, road condition, and land-use variables was analyzed and quantified. The management of land-use variables could be as important as traffic control and road maintenance for road dust mitigation. Further research interests are discussed.

摘要

车辆非尾气排放是颗粒物的主要组成部分，包括轮胎、制动器、道路的直接磨损以及沉积颗粒的再悬浮。建议重悬浮 PM (RPM) 排放量与城市中心的燃烧排放量相同甚至更大。影响 RPM 的因素可分为四类：道路特征、交通状况、土地利用和气象。为了研究和评估这些影响因素，在波哥大的 41 个地点收集了小于 10 微米 (RD10) 的道路灰尘。采样点具有不同的特征。RD10 水平在 1.0 和 45.8 mg/m ²之间变化，平均为 8.9 ± 8.4 mg/m ². 当植被密度高、路面状况良好、行驶速度快且没有施工活动时，观察到较低的 RD10 值。相反，RD10 在重载交通影响和干燥条件下增加。在降尘措施中，土地利用变量的管理可能与交通控制和道路维护一样重要。

意义：这项研究首次记录了拉丁美洲小于 10 微米的粉尘负荷，这些信息可用于估计该地区的再悬浮颗粒物排放。分析和量化了气象、交通特征、道路状况和土地利用变量的影响。土地利用变量的管理可能与交通控制和道路维护对于减少道路扬尘一样重要。进一步的研究兴趣进行了讨论。