Silt loading (sL) is an important parameter used to calculate fugitive road dust emission inventories and to reflect emission characteristics. The AP-42 method is commonly used to obtain sL values, but is time consuming, unsafe and can only be used on a limited number of roads. We propose a method combining the AP-42 and Testing Re-entrained Aerosol Kinetic Emissions from Roads (TRAKER) methods to accurately measure sL values. By analyzing sL values and the emission potentials (θ) of 12 typical urban roads in Baoding, China during spring, we found that the sL values have a strong correlation with θ (Pearson correlation coefficient 0.94; p = 0.01). We investigated the distribution of sL over a large number of urban areas, including 93 urban roads in Baoding, based on the close relationship between sL values and θ. Our results show that the average sL values are influenced by the size of the sampling area—for example, if the AP-42 method is only used to sample a few typical roads, then this might lead to high uncertainties in the emission inventories for road dust. Hence using a rapid detection system and expanding the detection range are both important if we are to acquire more accurate sL values. Our methods and results provide a unique perspective with which to acquire the emission characteristics of road dust.

淤泥负荷（sL）是用于计算逃逸性道路扬尘排放清单和反映排放特征的重要参数。AP-42方法通常用于获取sL值，但耗时，不安全并且只能在有限数量的道路上使用。我们提出了一种结合AP-42和测试道路重夹带气溶胶动力学排放的方法（TRAKER），以准确测量sL值。通过分析春季保定市12条典型城市道路的sL值和排放潜力（θ），我们发现sL值与θ具有很强的相关性（Pearson相关系数0.94; p = 0.01）。基于sL值与θ的密切关系，我们调查了sL在许多城市地区（包括保定市的93条城市道路）的分布。我们的结果表明，平均sL值受采样区域大小的影响-例如，如果AP-42方法仅用于对一些典型道路进行采样，那么这可能会导致道路排放清单的高度不确定性灰尘。因此，如果我们要获取更准确的sL值，则使用快速检测系统和扩大检测范围都非常重要。我们的方法和结果为获得道路尘埃排放特征提供了独特的视角。