Dust pollution has the characteristics of uncertain source strength, random emission, and diverse emission locations and types. There are difficulties in supervision, and dust pollution has a great negative impact on air quality improvement. In order to effectively prevent and control urban dust pollution, we need to fully understand the distribution of fixed dust sources in the city, monitor the concentration of particulate pollution on roads and surrounding construction sites, and further prevent and control dust pollution in key areas in a targeted manner. Nofang has customized a comprehensive atmospheric dust control plan based on all-round monitoring methods, including taxi cruise atmospheric monitoring, satellite remote sensing scanning and drone on-site patrol, supplemented by "scientific prevention + technical prevention" monitoring methods, to obtain atmospheric particulate analysis and monitoring data from multiple angles, and objectively and efficiently reflect the problem situation. With tracing as the core, through road particulate matter big data analysis, satellite remote sensing high-precision large-scale identification of fixed dust emission sources such as construction site dust and exposed land, drone small-scale aerial photography of construction site violations, and professional and technical personnel one by one investigation, the pollution source is screened and the pollution evidence is locked. From point to surface, the source and problems of particulate pollution are accurately found at multiple levels, the ability and efficiency of problem discovery are improved, and data support is provided for tracing the source of particulate pollution . With the purpose of rectification, based on the dust pollution problems discovered through cruise monitoring and tracing, we regularly issue atmospheric dust pollution source tracing analysis reports, send them to relevant districts, cities and departments, inform them of the rectification, and establish a "monitoring -tracing-rectification" closed-loop control model for dust pollution, coupled with regular reviews, to promote the implementation of rectification of dust problems, ensure that every pollution problem is promptly reported, problems and hidden dangers are fed back in real time, measures and methods are communicated in real time, and rectification implementation is reported in real time, forming a closed- loop management system for atmospheric dust and improving the quality of the urban air environment.

In the sky, high-resolution satellite image data and remote sensing intelligent algorithms are used to identify fixed dust emission sources such as urban bare land, construction dust, garbage dumps and bare construction land with high precision, all-weather, quasi-real-time and large-scale. Through the remote sensing image interpretation process, the spatial location information of the dust emission source, the size of the dust source area and the surrounding environment information of the dust source are identified. In the air, drones are used to conduct fine dust monitoring in key air pollution areas, and aerial inspections and aerial photography are carried out by drones. The aerial photography is sent back in real time to achieve "pictures and truth" and to investigate the dust problems in the city in a targeted manner. On the ground, the taxi cruise atmospheric monitoring system is mainly used to monitor the particulate pollution of the road network in real time, forming a road particulate pollution cloud map, which is convenient for timely detection of local road pollution sources and some large particulate pollution sources.

By combining taxi air monitoring data, satellite remote sensing analysis data, and drone aerial images, we conduct multivariate data fusion analysis on the overall pollution status of urban particulate matter , pollution distribution, concentration level, and distribution of exposed land, forming a " monitoring-tracing-assignment-rectification" supervision model. By analyzing the temporal and spatial distribution patterns of the data, we can find out the main sources of pollution that affect urban dust pollution and promote all-round closed-loop control of urban dust pollution.

According to the taxi cruise monitoring results, we issue 10-day, monthly and annual reports on time and send them to the relevant district and city governments. We issue daily reports every day, reporting the 20 road sections with the highest concentration of particulate matter in the cruise monitoring road environment, and send them to the dust prevention and control work group to guide the rectification of problem sections and surrounding environments, and color-code sections with excessive values. The relevant districts and cities will rectify the sections with excessive dust on the same day and feedback measures.

Carry out satellite remote sensing monitoring, use satellite remote sensing for large-scale, high-precision identification, analyze bare soil types such as exposed land, construction sites, and material yards, establish bare soil files, and issue a bare soil list to effectively improve the efficiency of dust pollution inspections and supervision.

Through drone tracing patrols, we conduct aerial photography inspections on the taxi monitoring routes, the list of dust pollution sources analyzed by satellite remote sensing, and the implementation of dust prevention and control measures in construction sites and bare soil within a certain range in the surrounding key areas. We can overlook the project from a high altitude, clearly identify existing problems , and accurately check the implementation of dust control measures. Evidence is quickly collected through partial video and photography, and the pollution problems found are sent to the work group. The responsible team will rectify them within a time limit and provide feedback on the rectification results. The Atmospheric Office submits ten-day reports to the municipal government and further supervises rectification of any rectifications that have not been completed. At the same time, prominent issues such as bare soil, material yards, construction sites, road dust, and demolition sites will be made into monthly meeting videos for reporting, and the responsible units will implement rectification. Carry out “looking back” and regular re-examinations on prominent and key issues. The implementation of the project has formed a supervision model of "monitoring-tracing-assignment-rectification". At the same time, a "look back" system was established to conduct irregular inspections on dust pollution issues and achieve dynamic supervision, and the results of dust pollution control were quite significant.

The implementation of the project, Qingdao has used satellite remote sensing, drones, taxi cruise monitoring and other "air-ground" integrated technical means to cover the "line -point-surface" monitoring dimensions, accurately discover and control various dust sources, establish a problem ledger, and organize various districts and cities and relevant responsible departments to carry out comprehensive governance, effectively realizing the rectification of dust problems . It has become an important tool for the Municipal Ecological Environment Bureau to strengthen dust pollution management. The implementation of the project over the years has proved that the project has played a positive role in discovering pollution emission points on both sides of the road, quickly, promptly and effectively eliminating dust pollution, improving particulate matter concentration, and improving air pollution management efficiency and dust pollution control results.