依研究結果顯示，四種不同區域街塵負荷量洗街前介於1.87~2.42 g/m2，街塵負荷分佈比例為22.9~28.8%。四種不同區域坋土負荷量洗街前介於0.39~0.60 g/m2，坋土負荷分佈比例為4.32~7.93 %，坋土負荷量以工業區最高，商業區最低。在四個不同區域當中街塵削減係數大小依序為住宅區(5.82 kg/km)＞郊區(5.43 kg/km)＞商業區(4.98 kg/km)＞工業區(4.53 kg/km) ，平均值則為5.19 kg/km，若能夠有效控制住宅區及郊區區域的洗街成效，想必對周界空氣品質有良好的提升。 The research aimed at studying the dust in four different regional types (suburbs, residential district, business district and industrial zone) in a certain metropolitan area at Southern Taiwan regarding its properties, load and the reduction effect on road dust from the execution of road sweeping. In total 140 roads were sampled as experimental data. Then grain size analysis and sweeping efficiency assessment were conducted and researched to investigate dust properties and grain size distribution of the roads in different regional types, investigate road transportation and surrounding environment conditions, the distribution of dust dispersed or settled and the effects on the road from the dust brought by cars in each zone, and further, analyze different sand grain diameter.
According to the research results, the street dust loading in four different areas is between 1.87 and 2.42 g/m2 before washing, and the distribution of street dust loading is 22.9~28.8%. The silt loading in four different areas is between 0.39 and 0.60 g/m2 before washing, and the distribution of silt loading is 4.32~7.93 %. The silt loading is the highest in the industrial area and the lowest in the commercial area. Among the four different areas, the street dust reduction coefficient is in the order of residential area (5.82 kg/km) > suburban area (5.43 kg/km) > commercial area (4.98 kg/km) > industrial area (4.53 kg/km), the average value is 5.19 kg/km. If the street washing effect in residential areas and suburban areas can be effectively controlled, it will definitely improve the air quality of its surroundings.
