基于积尘走航监测的宜宾市道路扬尘排放特征及防治措施研究OACSTPCD

To study the distribution and emission characteristics of road dust on different road types in Yibin,the road dust load monitoring equipment based on the method of light scattering was used to test the road dust load of different regions and road types in Yibin.The road dust emission volume in Yibin was estimated based on the emission factor method,and the road dust pollution control countermeasures were proposed according to the emission characteristics of road dust.The results showed that:(1)The road cleaning effect in Yibin was uneven,with a dust load of 2.21 g/m2,which was significantly higher than that of urban roads(1.03 g/m2);the dust load of urban roads was as follows:expressway(0.43 g/m2)＜main road(0.74 g/m2)＜secondary road(1.04 g/m2)＜branch road(1.90 g/m2);the dust load of highways was as follows:expressway(0.98 g/m2)＜secondary highway(1.09 g/m2)＜third-level highway(2.01 g/m2)＜fourth-level highway(4.75 g/m2);(2)most of the road dust load levels monitored were low or very low,with only 25％good and excellent roads in the central urban area;(3)the PM10 and PM2.5 emissions in Yibin in 2023 were 22 600 t and 5 300 t,respectively;the highways and fourth-level roads contributed more to the road dust emissions in Yibin,with an average of about 20.9％and 20.4％,respectively;and(4)the road dust pollution control in Yibin should focus on"key areas"and reduction of road dust emissions through strengthening the control of the source and increasing the frequency of road cleaning.The study suggests that road dust emissions in Yibin have a significant impact on the ambient air quality and further control measures should be taken for highways and rural roads.